Looking for ktcpvs but not quite

[Christen R. Pacheco]

SIP Express Router supports TCP SIP.

-----Original Message-----
From: lvs-users-bounces at LinuxVirtualServer.org
[mailto:lvs-users-bounces at LinuxVirtualServer.org] On Behalf Of Erik
Versaevel
Sent: Thursday, January 13, 2005 5:21 AM
To: lvs-users at linuxvirtualserver.org
Subject: Looking for ktcpvs but not quite

Hello,

I'm currently trying to create a loadbalacing SIP (voip protocol) 
cluster, however for this to work I need SIP messages from the same call

(identifiable by the sip callid field) to get to the same realserver 
over and over again. (so, I need persistence based on the contents of 
the SIP Call-ID field). This would call for ktcpvs as we need to process

packets at layer 7, however that poses 2 new problems, the first is that

SIP uses clear text  UDP messages, not tcp and the second is that there 
are no SIP modules for ktcpvs.

Another option would be to mark SIP packets with iptables/netfilter 
based on the callid, however i run into the same problem, there are no 
modules to accomplish this.

I know that there are commercial products available who are able to do 
SIP session persistence based on callid, the F5 Big-IP for example, the 
downside of that is it costs around $ 10.000 for a single loadbalancer 
(which is a SPOF so you need 2) and is a bit overkill as i don't need 
multi gigabit loadbalancing.

Any thoughts on this?

Kind regards,

E. Versaevel

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