From f1b8d48df15c46492b64e3fb535b97d0454afff6 Mon Sep 17 00:00:00 2001
From: Cameron Gutman <aicommander@gmail.com>
Date: Fri, 7 Aug 2009 03:21:56 +0000
Subject: [PATCH]  - Send a gratuitous ARP packet when our IP address changes

svn path=/trunk/; revision=42455
---
 reactos/lib/drivers/ip/network/arp.c | 5 +++++
 reactos/lib/drivers/ip/network/ip.c  | 6 +++++-
 2 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/reactos/lib/drivers/ip/network/arp.c b/reactos/lib/drivers/ip/network/arp.c
index 94f3216a6c6..35419284b7b 100644
--- a/reactos/lib/drivers/ip/network/arp.c
+++ b/reactos/lib/drivers/ip/network/arp.c
@@ -123,6 +123,11 @@ BOOLEAN ARPTransmit(PIP_ADDRESS Address, PIP_INTERFACE Interface)
 
     TI_DbgPrint(DEBUG_ARP, ("Called.\n"));
 
+    /* If Address is NULL then the caller wants an
+     * gratuitous ARP packet sent */
+    if (!Address)
+        Address = &Interface->Unicast;
+
     switch (Address->Type) {
         case IP_ADDRESS_V4:
             ProtoType    = (USHORT)ETYPE_IPv4; /* IPv4 */
diff --git a/reactos/lib/drivers/ip/network/ip.c b/reactos/lib/drivers/ip/network/ip.c
index 3653fd282ba..b56cf9355ee 100644
--- a/reactos/lib/drivers/ip/network/ip.c
+++ b/reactos/lib/drivers/ip/network/ip.c
@@ -222,8 +222,12 @@ VOID IPAddInterfaceRoute( PIP_INTERFACE IF ) {
 
     if (!RouterAddRoute(&NetworkAddress, &IF->Netmask, NCE, 1)) {
 	TI_DbgPrint(MIN_TRACE, ("Could not add route due to insufficient resources.\n"));
-        return;
     }
+
+    /* Send a gratuitous ARP packet to update the route caches of
+     * other computers */
+    if (IF != Loopback)
+       ARPTransmit(NULL, IF);
 }
 
 BOOLEAN IPRegisterInterface(