Varnish and multiple interfaces

[David Birdsong]

Henry sort of implied that the for the purposes of the test, nginx and
varnish were configured similarly in the HTTP chain--that they
theoretically sat in the same ip space and should, therefore, connect
to the backend as from the same source ip.

Right Henry?

On Tue, Oct 4, 2011 at 1:01 AM, Mattias Geniar <mattias at nucleus.be> wrote:
>> According to tcpdump, traffic from varnish is coming from eth0
> (incorrect IP)
>> and traffic coming from nginx is coming from eth0:0 (correct IP).
> Apache logs
>> are also confirming the IP information.
>
> That's possible, if both eth0 and eth0:0 are in different subnets. If
> your backend for nginx is in the same subnet as eth0:0 but in a
> different subnet as eth0, it'll go via the eth0:0 alias.
>
> So my guess would be that your varnish backend is in a different subnet
> than your eth0:0 so it takes the default route via eth0?
>
> Regards,
> Mattias
>
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