Varnish and multiple interfaces

[David Birdsong]

Are the remote backends by chance looking at either the layer 4 (ip
level) address OR if present, a value found in an http header such as
X-Forwarded-For?

On Mon, Oct 3, 2011 at 7:31 PM, Henry M. Umansky <humansky at princeton.edu> wrote:
> That's what I thought too, but I'm also running nginx on the same machine. I
> set up nginx to listen to eth0:0,  and all traffic to the remote backend
> sees the IP address of eth0:0. However, when I try to do the same with
> Varnish, the backends sees the IP address of eth0.
>
> Henry Umansky
> Web Development Services
> Princeton University
> humansky at princeton.edu
> 609-258-1674
>
> On Oct 3, 2011, at 10:02 PM, David Birdsong wrote:
>
> Varnish doesn't send traffic out of interfaces, the OS does. Your
> kernel routing table will determine which device is part of a
> particular route. For most traffic, the 'default' route is the route
> that matches outbound traffic.  You can change your default route to
> exit a particular interface--though I'm not sure if an ethernet alias
> will work. Try it out.
>
> On Mon, Oct 3, 2011 at 6:26 PM, Henry M. Umansky <humansky at princeton.edu>
> wrote:
>
> Hello,
>
> I'm running Varnish 2.1.5 on Red Hat Enterprise Linux Server release 6.1.
> Currently I have two interfaces: eth0 and an alias eth0:0. I need Varnish to
> bind to eth0:0, which it does perfectly, however, outgoing traffic is going
> through eth0. Is there anyway to tell Varnish to send outgoing traffic
> through the same IP address I tell varnish to "listen" to? I guess I can
> route the traffic accordingly via iptables, but I'd prefer to do it at the
> application layer if possible.
>
> Any help would be much appreciated, varnish is an amazing product!!!
>
> Henry Umansky
>
> Web Development Services
>
> Princeton University
>
> humansky at princeton.edu
>
> 609-258-1674
>
>
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