7ddda493c0
initial idea from Steve Simon, but doesnt require reverse lookup of the callers ip address.
854 lines
16 KiB
Text
854 lines
16 KiB
Text
.TH NDB 8
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.SH NAME
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query, ipquery, mkhash, mkdb, mkhosts, cs, csquery, dns, dnstcp, dnsquery, dnsdebug, dnsgetip, inform \- network database
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.SH SYNOPSIS
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.B ndb/query
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[
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.B -am
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] [
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.B -f
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.I dbfile
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]
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.I "attr value"
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[
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.I rattr
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.\" [
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.\" .I reps
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.\" ]
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]
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.br
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.B ndb/ipquery
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.I "attr value"
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.I rattr...
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.br
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.B ndb/mkhash
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.I "file attr"
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.br
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.B ndb/mkdb
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.br
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.B ndb/mkhosts
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[
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.I domain
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[
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.I dbfile
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] ]
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.br
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.B ndb/cs
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[
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.B -46n
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] [
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.B -f
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.I dbfile
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] [
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.B -x
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.I netmtpt
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]
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.br
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.B ndb/csquery
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[
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.B -s
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]
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[
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.I /net/cs
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[
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.I addr...
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]
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]
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.br
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.B ndb/dns
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[
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.B -norRs
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] [
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.B -a
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.I maxage
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] [
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.B -f
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.I dbfile
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] [
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.B -N
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.I target
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] [
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.B -x
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.I netmtpt
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] [
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.B -z
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.I program
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]
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.br
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.B ndb/dnstcp
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[
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.B -arR
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] [
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.B -f
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.I dbfile
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] [
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.B -x
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.I netmtpt
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] [
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.I conn-dir
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]
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.br
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.B ndb/dnsquery
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[
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.B -x
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] [
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.I /net/dns
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]
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.br
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.B ndb/dnsdebug
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[
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.B -rx
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] [
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.B -f
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.I dbfile
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] [ [
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.BI @ server
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]
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.I domain-name
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[
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.I type
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] ]
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.br
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.B ndb/dnsgetip
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[
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.B -ax
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]
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.I domain-name
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.br
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.B ndb/inform
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[
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.B -x
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.I netmtpt
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]
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.SH DESCRIPTION
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The network database holds administrative information used by
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network programs such as
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.IR dhcpd (8),
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.IR ipconfig (8),
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.IR con (1),
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etc.
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.PP
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.I Ndb/query
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searches the database
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.I dbfile
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.RB ( /lib/ndb/local
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by default)
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for an attribute of type
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.I attr
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and value
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.IR value .
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If
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.I rattr
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is not specified, all entries matched by the search are printed.
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If
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.I rattr
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is specified, the value of the first pair with attribute
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.I rattr
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of all the matched entries normally is printed.
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Under
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.B -m
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and
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.IR rattr ,
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the values of all pairs with a
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.I rattr
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attribute within the first matching entry are printed.
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Under
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.B -a
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and
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.IR rattr ,
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all values of pairs with a
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.I rattr
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attribute within all entries are printed.
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.PP
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.I Ndb/ipquery
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uses
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.I ndbipinfo
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(see
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.IR ndb (2))
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to search for the values of the attributes
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.I rattr
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corresponding to the system
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with entries of attribute type
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.I attr
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and
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value
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.IR value .
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.PP
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.I Ndb/inform
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sends an RFC2136 DNS
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.I inform
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packet to a nameserver to associate the host's IP address with its DNS name.
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This is required if the domain's nameserver is
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a Microsoft Windows Active Directory controller.
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The host's domain name will be sent to the AD controller unless
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a tuple of the form
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.BI inform= xxx
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is found in the host's
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.I ndb
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entry.
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.SS "Database maintenance"
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.I Ndb/mkhash
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creates a hash file for all entries with attribute
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.I attr
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in database file
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.IR file .
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The hash files are used by
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.I ndb/query
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and by the ndb library routines.
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.PP
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.I Ndb/mkdb
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is used in concert with
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.IR awk (1)
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scripts to convert
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uucp systems files and IP host files
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into database files.
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It is very specific to the situation at Murray Hill.
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.PP
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When the database files change underfoot,
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.I ndb/cs
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and
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.I ndb/dns
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track them properly. Nonetheless, to keep the database searches efficient
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it is necessary to run
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.I ndb/mkhash
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whenever the files are modified.
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It may be profitable to control this by a frequent
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.IR cron (8)
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job.
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.PP
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.I Ndb/mkhosts
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generates a BSD style
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.BR hosts ,
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.BR hosts.txt ,
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and
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.B hosts.equiv
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files from an ndb data base file specified on the
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command line (default
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.BR /lib/ndb/local ).
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For local reasons the files are called
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.BR hosts.1127 ,
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.BR astro.txt ,
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and
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.BR hosts.equiv .
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.SS "Connection service"
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.I Ndb/cs
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is a server used by
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.IR dial (2)
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to translate network names.
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It is started at boot time.
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It finds out what networks are configured
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by looking for
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.B /net/*/clone
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when it starts.
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It can also be told about networks by writing to
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.B /net/cs
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a message of the form:
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.IP
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.B "add net1 net2 ..."
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.PP
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.I Ndb/cs
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also sets the system name in
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.B /dev/sysname
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if it can figure it out.
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The options are:
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.TF -n
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.TP
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.B -4
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Only look up IPv4 addresses (A records) when consulting DNS.
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The default is to also look up v6 addresses (AAAA records).
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Writing
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.L ipv4
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to
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.B /net/cs
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will toggle IP v4 look-ups.
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.TP
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.B -6
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Only look up IPv6 addresses in DNS.
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Writing
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.L ipv6
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to
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.B /net/cs
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toggles v6 lookups.
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.TP
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.B -f
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supplies the name of the data base file to use,
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default
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.BR /lib/ndb/local .
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.TP
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.B -n
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causes cs to do nothing but set the system name.
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.TP
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.B -x
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specifies the mount point of the
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network.
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.PD
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.PP
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.I Ndb/csquery
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queries
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.I ndb/cs
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to see how it resolves addresses.
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.I Ndb/csquery
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prompts for addresses and prints what
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.I ndb/cs
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returns.
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.I Server
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defaults to
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.BR /net/cs .
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If any
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.I addrs
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are specified,
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.I ndb/csquery
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prints their translations and immediately exits.
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The exit status will be nil only if all addresses
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were successfully translated.
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The
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.B -s
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flag sets exit status without printing any results.
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.br
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.ne 4
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.SS "Domain name service"
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.I Ndb/dns
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serves
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.I ndb/cs
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and remote systems by translating Internet domain names.
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.I Ndb/dns
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is started at boot time.
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By default
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.I dns
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serves only requests written to
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.BR /net/dns .
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Programs must
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.I seek
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to offset 0 before reading or writing
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.B /net/dns
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or
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.BR /net/cs .
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The options are:
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.TF -n
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.TP
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.B -a
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sets the maximum time in seconds that an unreferenced
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domain name will remain cached.
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The default is one hour (3600).
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.TP
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.B -f
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supplies the name of the data base file to use,
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default
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.BR /lib/ndb/local .
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.TP
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.B -n
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whenever a DNS zone that we serve changes, send UDP NOTIFY
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messages to any dns slaves for that zone
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(see the
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.L dnsslave
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attribute below).
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.TP
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.B -N
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sets the goal for the number of domain names cached to
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.I target
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rather than the default of 8,000.
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.TP
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.B -o
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used with
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.BR -s ,
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.B -o
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causes
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.I dns
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to assume that it straddles inside and outside networks
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and that the outside network is mounted on
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.BR /net.alt .
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Queries for inside addresses will be sent via
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.B /net/udp
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(or
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.B /net/tcp
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in response to truncated replies)
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and those for outside addresses via
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.B /net.alt/udp
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(or
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.BR /net.alt/tcp ).
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This makes
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.I dns
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suitable for serving non-Plan-9 systems in an organization with
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firewalls, DNS proxies, etc.,
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particularly if they don't work very well.
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See `Straddling Server' below for details.
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.TP
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.B -r
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act as a resolver only:
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send `recursive' queries, asking the other servers
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to complete lookups.
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If present,
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.B /env/DNSSERVER
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must be a space-separated list of such DNS servers' IP addresses,
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otherwise optional
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.IR ndb (6)
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.B dns
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attributes name DNS servers to forward queries to.
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.TP
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.B -R
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ignore the `recursive' bit on incoming requests.
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Do not complete lookups on behalf of remote systems.
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.TP
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.B -s
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also answer domain requests sent to UDP port 53.
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.TP
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.B -x
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specifies the mount point of the
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network.
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.TP
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.B -z
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whenever we receive a UDP NOTIFY message, run
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.I program
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with the domain name of the area as its argument.
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.PD
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.PP
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When the
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.B -r
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option is specified, the servers used come from the
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.I dns
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attribute in the database. For example, to specify a set of dns servers that
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will resolve requests for systems on the network
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.IR mh-net :
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.IP
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.EX
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ipnet=mh-net ip=135.104.0.0 ipmask=255.255.0.0
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dns=ns1.cs.bell-labs.com
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dns=ns2.cs.bell-labs.com
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dom=ns1.cs.bell-labs.com ip=135.104.1.11
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dom=ns2.cs.bell-labs.com ip=135.104.1.12
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.EE
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.LP
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The server for a domain is indicated by a database entry containing
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both a
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.I dom
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and a
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.I ns
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attribute.
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.IP
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.EX
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dom=
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ns=A.ROOT-SERVERS.NET
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ns=B.ROOT-SERVERS.NET
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ns=C.ROOT-SERVERS.NET
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dom=A.ROOT-SERVERS.NET ip=198.41.0.4
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dom=B.ROOT-SERVERS.NET ip=128.9.0.107
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dom=C.ROOT-SERVERS.NET ip=192.33.4.12
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.EE
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.LP
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The last three lines provide a mapping for the
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server names to their ip addresses. This is only
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a hint and will be superseded from whatever is learned
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from servers owning the domain.
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.SS "Authoritative Name Servers"
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You can also serve a subtree of the domain name space from the local
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database. You indicate subtrees that you would like to serve by adding an
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.B soa=
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attribute to the root entry.
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For example, the Bell Labs CS research domain is:
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.IP
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.EX
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dom=cs.bell-labs.com soa=
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refresh=3600 ttl=3600
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ns=plan9.bell-labs.com
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ns=ns1.cs.bell-labs.com
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ns=ns2.cs.bell-labs.com
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mb=presotto@plan9.bell-labs.com
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mx=mail.research.bell-labs.com pref=20
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mx=plan9.bell-labs.com pref=10
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dnsslave=nslocum.cs.bell-labs.com
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dnsslave=vex.cs.bell-labs.com
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.EE
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.LP
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Here, the
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.B mb
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entry is the mail address of the person responsible for the
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domain (default
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.BR postmaster ).
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The
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.B mx
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entries list mail exchangers for the domain name and
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.B refresh
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and
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.B ttl
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define the area refresh interval and the minimum TTL for
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records in this domain.
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The
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.B dnsslave
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entries specify slave DNS servers that should be notified
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when the domain changes. The notification also requires
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the
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.B -n
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flag.
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.
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.SS "Reverse Domains"
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You can also serve reverse lookups (returning the name that
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goes with an IP address) by adding an
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.B soa=
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attribute to the entry defining the root of the reverse space.
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.PP
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For example, to provide reverse lookup for all addresses in
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starting with
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.L 135.104
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or
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.LR fd00:: ,
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.I ndb
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must contain a record like:
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.IP
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.EX
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dom=104.135.in-addr.arpa soa=
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dom=d.f.ip6.arpa soa= # special case, rfc 4193
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refresh=3600 ttl=3600
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ns=plan9.bell-labs.com
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ns=ns1.cs.bell-labs.com
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ns=ns2.cs.bell-labs.com
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.EE
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.LP
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Notice the form of the reverse address.
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For IPv4, it's the bytes of the address range you are serving reversed
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and expressed in decimal, and with
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.L .in-addr.arpa
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appended.
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For IPv6, it's the nibbles (4-bit fields) of the address range you are serving
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reversed and expressed in hexadecimal, and with
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.L .ip6.arpa
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appended.
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These are the standard forms for a domain name in a PTR record.
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.PP
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If such an
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.B soa
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entry exists in the database, reverse addresses will
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automatically be generated from any IP addresses in the database
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that are under this root. For example
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.IP
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.EX
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dom=ns1.cs.bell-labs.com ip=135.104.1.11
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.EE
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.LP
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will automatically create both forward and reverse entries for
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.BR ns1.cs.bell-labs.com .
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Unlike other DNS servers, there's no way to generate
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inconsistent forward and reverse entries.
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.SS "Classless reverse delegation"
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Following RFC 2317, it is possible to serve reverse DNS data
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for IPv4 subnets smaller than /24.
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Declare the non-/24 subnet, the reverse domain and the individual systems.
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.PP
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For example,
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this is how to serve RFC-2317
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.B ptr
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records for the subnet
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.LR 65.14.39.128/123 .
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.IP
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.EX
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ipnet=our-t1 ip=65.14.39.128 ipmask=/123
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dom=128.39.14.65.in-addr.arpa soa=
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refresh=3600 ttl=3600
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ns=ns1.our-domain.com
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ns=ns2.our-domain.com
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ip=65.14.39.129 dom=router.our-domain.com
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.EE
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.
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.SS "Delegating Name Service Authority"
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Delegation of a further subtree to another set of name servers
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is indicated by an
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.B soa=delegated
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attribute.
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.IP
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.EX
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dom=bignose.cs.research.bell-labs.com
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soa=delegated
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ns=anna.cs.research.bell-labs.com
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ns=dj.cs.research.bell-labs.com
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.EE
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.LP
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Nameservers within the delegated domain (as in this example)
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must have their IP addresses listed elsewhere in
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.I ndb
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files.
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.
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.SS "Wildcards, MX and CNAME records"
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Wild-carded domain names can also be used.
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For example, to specify a mail forwarder for all Bell Labs research systems:
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.IP
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.EX
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dom=*.research.bell-labs.com
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mx=research.bell-labs.com
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.EE
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.LP
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`Cname' aliases may be established by adding a
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.B cname
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attribute giving the real domain name;
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the name attached to the
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.B dom
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attribute is the alias.
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`Cname' aliases are severely restricted;
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the aliases may have no other attributes than
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.B dom
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and are daily further restricted in their use by new RFCs.
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.IP
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.EX
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cname=anna.cs.bell-labs.com dom=www.cs.bell-labs.com
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.EE
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.PP
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makes
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.BI www. ...
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a synonym for the canonical name
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.BI anna. ... .
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.SS "Straddling Server"
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Many companies have an inside network
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protected from outside access with firewalls.
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They usually provide internal `root' DNS servers
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(of varying reliability and correctness)
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that serve internal domains and pass on DNS queries for
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outside domains to the outside, relaying the results
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back and caching them for future use.
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Some companies don't even let DNS queries nor replies through
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their firewalls at all, in either direction.
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.PP
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In such a situation, running
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.B "dns -so"
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on a machine that imports access to the outside network via
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.B /net.alt
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from a machine that straddles the firewalls,
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or that straddles the firewalls itself,
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will let internal machines query such a machine
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and receive answers from outside nameservers for outside addresses
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and inside nameservers for inside addresses, giving the appearance
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of a unified domain name space,
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while bypassing the corporate DNS proxies or firewalls.
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This is different from running
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.B "dns -s"
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and
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.B "dns -sRx /net.alt -f /lib/ndb/external"
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on the same machine,
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which keeps the inside and outside namespaces entirely separate.
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.PP
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Under
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.BR -o ,
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several
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.I sys
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names are significant:
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.BR inside-dom ,
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.BR inside-ns ,
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and
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.BR outside-ns .
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.I Inside-dom
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should contain a series of
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.B dom
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pairs naming domains internal to the organization.
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.I Inside-ns
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should contain a series of
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.B ip
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pairs naming the internal DNS `root' servers.
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.I Outside-ns
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should contain a series of
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.B ip
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pairs naming the external DNS servers to consult.
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.SS "Zone Transfers and TCP"
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.I Dnstcp
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is invoked,
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usually from
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.BR /rc/bin/service/tcp53 ,
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to answer DNS queries with long answers via TCP,
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notably to transfer a zone within the database
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.I dbfile
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(default
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.BR /lib/ndb/local )
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to its invoker on the network at
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.I netmtpt
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(default
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.BR /net ).
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Standard input will be read for DNS requests and the DNS answers
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will appear on standard output.
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Recursion is disabled by
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.BR -R ;
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acting as a pure resolver is enabled by
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.BR -r .
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Unless the
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.B -a
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flag is provided, clients requesting DNS zone transfer must be listed
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with a
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.B dnsslave
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attribute for the relevant domain.
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If
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.I conn-dir
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is provided, it is assumed to be a directory within
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.IB netmtpt /tcp
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and is used to find the caller's address.
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.SS "DNS Queries and Debugging"
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.I Ndb/dnsquery
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can be used to query
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.I ndb/dns
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to see how it resolves requests.
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.I Ndb/dnsquery
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prompts for commands of the form
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.IP
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.I "domain-name request-type"
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.LP
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where
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.I request-type
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can be
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.BR ip ,
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.BR ipv6 ,
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.BR mx ,
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.BR ns ,
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.BR cname ,
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.BR ptr ....
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In the case of the inverse query type,
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.BR ptr ,
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.I dnsquery
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will reverse the ip address and tack on the
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.B .in-addr.arpa
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if necessary.
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The
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.B -x
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option switches
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.I ndb/dnsquery
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to query the dns server on
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.B /net.alt
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instead of
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.B /net
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.PP
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.I Ndb/dnsdebug
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is like
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.I ndb/dnsquery
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but bypasses the local server.
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It communicates via UDP (and sometimes TCP) with the domain name servers
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in the same way that the local resolver would and displays
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all packets received.
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The query can be specified on the command line or
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can be prompted for.
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The queries look like those of
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.I ndb/dnsquery
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with one addition.
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.I Ndb/dnsdebug
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can be directed to query a particular name server by
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the command
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.BI @ name-server\f1.
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From that point on, all queries go to that name server
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rather than being resolved by
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.IR dnsdebug .
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The
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.B @
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command returns query resolution to
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.IR dnsdebug .
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Finally, any command preceded by a
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.BI @ name-server
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sets the name server only for that command.
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.PP
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Normally
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.I dnsdebug
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uses the
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.B /net
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interface and the database file
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.BR /lib/ndb/local.
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The
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.B -f
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option supplies the name of the data base file to use.
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The
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.B -r
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option is the same as for
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.IR ndb/dns .
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The
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.B -x
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option directs
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.I dnsdebug
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to use the
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.B /net.alt
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interface and
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.B /lib/ndb/external
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database file.
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.PP
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.I Ndb/dnsgetip
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resolves and prints A and AAAA records without consulting
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.I ndb/dns .
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By default,
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.I ndb/dnsgetip
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queries A records first and then AAAA records. As with
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.I ndb/dns,
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.B /env/DNSSERVER
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or
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.IR ndb (6)
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.B dns
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attributes are used as the DNS server. The
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.I -a
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flag will return all records. The
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.B -x
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option switches
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.I ndb/dnsgetip
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to query the dns server through
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.B /net.alt
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instead of
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.B /net.
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.SH EXAMPLES
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Look up
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.B helix
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in
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.IR ndb .
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.IP
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.EX
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% ndb/query sys helix
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sys=helix dom=helix.research.bell-labs.com bootf=/mips/9powerboot
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ip=135.104.117.31 ether=080069020427
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.EE
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.br
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.ne 8
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.LP
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Look up
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.B plan9.bell-labs.com
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and its IP address in the DNS.
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.IP
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.EX
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% ndb/dnsquery
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> plan9.bell-labs.com ip
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plan9.bell-labs.com ip 204.178.31.2
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> 204.178.31.2 ptr
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2.31.178.204.in-addr.arpa ptr plan9.bell-labs.com
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2.31.178.204.in-addr.arpa ptr ampl.com
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>
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.EE
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.LP
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Print the names of all systems that boot via PXE.
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.IP
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.EX
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% ndb/query -a bootf /386/9bootpxe sys
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.EE
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.SH FILES
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.TF /lib/ndb/local.*xxx
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.TP
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.B /env/DNSSERVER
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resolver's DNS servers' IP addresses.
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.TP
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.B /lib/ndb/local
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first database file searched
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.TP
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.B /lib/ndb/local.*
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hash files for
|
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.B /lib/ndb/local
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.TP
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.B /srv/cs
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service file for
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.I ndb/cs
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.TP
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.B /net/cs
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where
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.B /srv/cs
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gets mounted
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.TP
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.B /srv/dns
|
|
service file for
|
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.I ndb/dns
|
|
.TP
|
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.B /net/dns
|
|
where
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.B /srv/dns
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gets mounted
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.SH SOURCE
|
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.B /sys/src/cmd/ndb
|
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.SH SEE ALSO
|
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.IR ndb (2),
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.IR ndb (6)
|
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.SH BUGS
|
|
.I Ndb
|
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databases are case-sensitive;
|
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ethernet addresses must be in lower-case hexadecimal.
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