[Asterisk-Dev] OT: R&D Loadbalancer SIP Questions

[Matt]

Check out http://www.xgforce.com/loadbalancer.html, it's providing virtual
ip and virtual domain balancing.

Best Regards

Matt
http://www.xgforce.com/product.html
____________________________________________
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http://www.xgforce.com/loadbalancer.html

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http://www.xgforce.com/eService.html

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http://www.xgforce.com/firewall.html

Gigabit 3U Tera Servers
http://www.xgforce.com/teraserver.html

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http://www.xgforce.com/server2u.html

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Gigabit Workstation HE
http://www.xgforce.com/workstation.html (Dual Xeon CPU Workstations)
__________________________________________________

----- Original Message ----- 
From: "Matthew Boehm" <mboehm at cytelcom.com>
To: <asterisk-dev at lists.digium.com>
Sent: Thursday, March 24, 2005 1:32 PM
Subject: [Asterisk-Dev] OT: R&D Loadbalancer SIP Questions


> I'm posting this here as the -dev people are most likely more intimate
with
> the SIP packet structure than -users are.
>
> I've been trying to find a pure SIP load balancer. We will soon be doing
> some major traffic and I feel that easiest growth is stacking * boxes
behind
> a load balancer. All calls will be SIP<->SIP or SIP -> PSTN; no PSTN->SIP
>
> Yes, I could use SER, but that is just another computer that could fail.
>
> I sent an email to Cisco. No response.
> I emailed Tasman Networks and they said to contact Kemp Tech.
>
> Just got off the phone with a technician at Kemp and he had the following
> questions for handling SIP load:
>
>     1. Which SIP header would be best to become the "session id"? He gave
> examples of Via header, callid header and From header. The header needs to
> be persistant across all packets per call and be unique between calls.
(not
> purely unique, meaning that the LB doesn't store id's past the termination
> of the call.)
>
>     2. Is the "session id" chosen in #1 also present in the audio payload
> packets?
>
>     3. I was under the impression that SIP over TCP was not yet an RFC
> standard but the tech seemed to think so. So his question was "at any time
> during a call, are there both tcp and udp packets refering to that same
> call? and with the same id as #1?"
>
>     4. Finally, he wanted to know what could he do to "query" each server
to
> determine if it should be in the pool of servers. For example, when doing
> HTTP requests, the LB examines the packet and if it finds any thing in the
> error 500 range, that server is marked as "down".  He said that he could
> send an INVITE to each server and as long as he recieved code XXX that
that
> server would remain in the pool. If no response recieved after XXms, or
the
> incorrect response code recieved, then the server is marked down and email
> fired off.
>
> Thoughts, questions, concerns are welcome.
>
> Thanks,
> Matthew
>
> -- 
> Matthew Boehm
>   There is no air in space.
>   If there was, we couldn't call it space.
>   It would be called atmosphere.
>
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