On Thu, 1 Mar 2007, Stephen Hemminger wrote:
What about implementing the unused arp_announce flag on the inetdevice?
Something like the following. Totally untested...
Looks like it either was there (and got removed) or was planned but
never implemented.
If something like this goes in, it wouldn't hurt to do similar with
IPv6 (RFC2461 section 7.2.6).
There are very popular hardware-based routers which refresh their NDP
caches only every 24 hours or 20 minutes (depending on the software
version). Sending unsolicited NAs would eliminate traffic
blackholing.
diff --git a/net/ipv4/devinet.c b/net/ipv4/devinet.c
index e10794d..cefc339 100644
--- a/net/ipv4/devinet.c
+++ b/net/ipv4/devinet.c
@@ -1089,6 +1089,16 @@ static int inetdev_event(struct notifier
}
}
ip_mc_up(in_dev);
+ /* fallthru */
+
+ case NETDEV_CHANGEADDR:
+ /* Send gratuitous ARP in case of address change or new device
*/
+ if (IN_DEV_ARP_ANNOUNCE(in_dev))
+ arp_send(ARPOP_REQUEST, ETH_P_ARP,
+ in_dev->ifa_list->ifa_address, dev,
+ in_dev->ifa_list->ifa_address, NULL,
+ dev->dev_addr, NULL);
+
break;
case NETDEV_DOWN:
ip_mc_down(in_dev);
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