[Users] Re: Hosts not responding, kinda urgent

Toby Burress tdb at dimins.com
Sat Feb 20 13:46:59 EST 2010


On Sat, Feb 20, 2010 at 09:24:09AM -0800, Gregor at HostGIS wrote:
>> It sounds like the switches they're attached to don't have the right
>> arp information.
>
> Kinda what I thought, but why?

Actually yeah, when I read your other messages in the thread and realized
it was only on some hosts, this seemed less likely.  I've had this happen
before when I forgot to enable proxy arp on one of my hardware nodes.
In that case, it was like 4am and I didn't have the energy to debug it,
so I just left an arpsend job running in cron every 5 minutes.

I've also had something like this happen when the firewall (wrongly)
had an alias that was the same as the IP of a virtual node.  In that
case of course tcpdump showed the cause immediately.


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