[Linux-HA] Gratuitous ARP

[btinsley]

Is anyone aware of a condition where a Linux server would not honor a
gratuitous ARP sent by heartbeat? I'm seeing this sporadically on a few
systems. I have two LVS servers in an active/passive configuration, which
provides the default gateway for another cluster. When the IP address for
the default gateway fails over to the passive server, the ARP tables on the
other cluster servers is not updated. The heartbeat log shows the send_arp
command being executed and this was verified with a network capture. The
problem seems to be isolated to the IP address for the default gateway...
I've never seen it happen with any other virtual IP address.