Varnish and multiple interfaces

[Henry M. Umansky]

That is correct, both applications are binding to the same IP from the same machine, just different port addresses.

Henry Umansky
Web Development Services
Princeton University
humansky at princeton.edu
609-258-1674

On Oct 4, 2011, at 4:11 AM, David Birdsong wrote:

> 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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