[Baylisa] DSR load balancer oddities with Ubuntu?

Fri May 10 12:53:54 PDT 2013

On Fri, May 10, 2013 at 12:24 PM, Ulf Zimmermann <ulf at alameda.net> wrote:

> Newer Linux kernel have a setting to disallow that. I am not at a computer
> to look up the sysctl variable but look for something starting with rt or
> rp.
>
> On May 10, 2013, at 12:12, Ray Wong <rayw at rayw.net> wrote:
>
> > Well, it sort of has to with DSR, right? :) the traffic hits the BigIP,
> forwards to the server, and the server replies directly out the router. I'm
> probably being thickheaded from a long week, do you mean some other sort of
> pathing?
>

I think Ulf is right, expect the other way around. You need different
return paths and Ubuntu disables them by default [1]. Try disabling return
path filtering [2].

[1] https://bugs.launchpad.net/ubuntu/+source/procps/+bug/201952
[2] http://serverfault.com/a/35769/148146