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ip(3): document special null-address hack for accepting all incoming connections

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cinap_lenrek 2019-12-15 13:59:08 +01:00
parent c3af90c6c7
commit b820d892a6
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16
sys/man/3/ip
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@ -185,6 +185,22 @@ ARP requests for the remote address.
.IR Ppp (8) .IR Ppp (8)
does this to make remote machines appear does this to make remote machines appear
to be connected to the local Ethernet. to be connected to the local Ethernet.
Adding the special null-address
.B "0.0.0.0"
or
.B "::"
in
.I local
to a interface makes the ip stack accept all incoming
connections regardless of the destination IP address.
This is used temporarily by
.IR ipconfig (8)
to accept DHCP answers when no IP address
has been assigned yet. This can also be used
to implement a NAT gateway by accepting all
incoming connections and proxying them with
.IR trampoline (8)
to a different ip stack.
.TP .TP
.BI remove\ "local mask" .BI remove\ "local mask"
Remove a local IP address from an interface. Remove a local IP address from an interface.