[Baylisa] DSR load balancer oddities with Ubuntu?

Fri May 10 12:24:09 PDT 2013

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. 

Ulf Zimmermann | OPENLANE, Inc.
2200 Bridge Parkway, Suite 202
Redwood City, CA 94065, USA
Tel +1-650-412-4042 | ulf at Openlane.com

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?
> 
> 
> On Fri, May 10, 2013 at 12:08 PM, Ulf Zimmermann <ulf at alameda.net> wrote:
>> Check if you are running into return path issue. I.e. traffic comes in one path tries to leave another.
>> 
>> Ulf Zimmermann | OPENLANE, Inc.
>> 2200 Bridge Parkway, Suite 202
>> Redwood City, CA 94065, USA
>> Tel +1-650-412-4042 | ulf at Openlane.com
>> 
>> 
>> On May 10, 2013, at 11:57, Ray Wong <rayw at rayw.net> wrote:
>> 
>> > Hey, I know the list has been quiet on tech discussions lately, but I'm
>> > hoping someone can help as my google-fu is not strong on this, it seems.
>> >
>> > We've been trying to migrate some of our old Fedora Core machines to Ubuntu
>> > (12.04LTS), and have run into an annoying difference in network behavior,
>> > which I'm hoping someone else has encountered and figured out a fix.
>> >
>> > We split our CIDR allocation, and backhaul our office bandwidth through the
>> > colo a couple blocks away. The load balanced network and the office are
>> > routed and separate blocks/masks/vlans, but for some reason office traffic
>> > can't seem to talk to Ubuntu servers using DSR behind an F5 BigIP. The FC
>> > machines work fine, it's only Ubuntu that doesn't seem able to do this, and
>> > it works from anywhere outside. I'm using the dummy interface for the VIPs
>> > with the arp_ignore set to 1 and arp_announce set to 2, which seems to have
>> > everything working except for this one strange issue.
>> >
>> > Anyone else doing this successfully?
>> > _______________________________________________
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>> > Baylisa at baylisa.org
>> > http://www.baylisa.org/mailman/listinfo/baylisa
>> >
> 