Re: heartbeat feature request: "Noisy" gratuitous arp

[kwijibo@xxxxxxxxxx]

Why don't you just statically set the ARP in your router?
You won't be able to do automatic director failover with
it set like this however.

Todd Lyons wrote:
> For reasons beyond my control, we have two real servers serving http
> that will answer an arp erroneously when the core router sends the arp
> request.  At that point, all traffic goes directly to that one real
> server.  The fix is for me to ssh to the load balancer, and manually
> run (obfuscated):
>
>     /usr/lib/heartbeat/send_arp -i 1010 -r 5 -p 
> /var/lib/heartbeat/rsctmp/send_arp/send_arp-xx.xx.xx.xx eth0 xx.xx.xx.xx auto 
> xx.xx.xx.xx ffffffffffff
>
> This is the same command that heartbeat runs when it does a failover
> and/or initially starts up.  When I run this command manually, the
> router and firewall properly replace the mac of the IP with the
> loadbalancer's mac.
>
> I would like to see a "noisy gratuitous arp" setting where you can tell
> heartbeat to occassional resend the gratuitous arp.  Something like:
>     noisy_arp 720  # 720 minutes = 12 hours
>
> I can write a script to manually do this if I need to.
>
> Yes, yes, I know that installing the proper kernel on the two real boxen
> would be the ideal choice.  We're talking legacy hardware/software
> though, which ties my hands.  I'm just curious if anybody thinks this is
> a good idea, or if I need to go ahead and just script it myself.