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On Mon, 2008-11-24 at 16:08 -0500, Eli Ben-Shoshan wrote:
> So after further investigation with tcpdump, I think I know what the problem
> is.
>
> When the realserver arps for the gateway's mac address, it does not get a
> response. The reason for this is that the realserver's IP address is not on
> the
> same network as the gateway. The realserver's IP address is 192.168.74.81 and
> the IP of the gateway is 128.227.74.126. Here is the relevant section of the
> tcpdump:
>
> 16:00:52.119149 arp who-has 128.227.74.126 tell 192.168.74.81
>
> After talking to my network people, they tell me that this is explicitly not
> allowed by their current configs. Has anyone run into this problem before?
Well... erm... change the gateway to be a device local to the
realserver.
I'm afraid this is a networking fundamental: the next-hop must be
reachable! In your case you're confusing "gateway" with "default route".
The realserver's default router to non-local networks must be reachable
from the realserver, and that router must itself then have a route to
"the internet" - 0.0.0.0/0 - which is itself reachable. And so on, and
so forth.
IP 101, I'm afraid.
Graeme
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