Varnish and multiple interfaces

David Birdsong david.birdsong at
Tue Oct 4 10:11:07 CEST 2011

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> 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
> _______________________________________________
> varnish-misc mailing list
> varnish-misc at

More information about the varnish-misc mailing list