load balancing H.323

Hi,

I'm trying to load-balance my H323 endpoint cluster
using LVS (ultramonkey). I'm using fwmark with
persistence in LVS-NAT configuration with two
interfaces (one facing the real servers the other
facing the public) at the director.

I use Netmeeting to make an H.323 call to the Virtual
Server and I see initial activity on h323 port (1720)
in one of the realservers, but then the protocol stops
advancing. I checked connectivity (pings and
traceroutes) between real servers and the client, and
everything checks out.

Has anyone tried load balancing H.323 real servers? Do
you have any idea what the problem might be? 

After so many tries, I have doubts about inherent
load-balancibility of a protocol like H.323.
load-balancing a protocol like HTTP is quite
straightforward. But I would like to know the
conditions, if there any,  for a protocol under which
LVS would not be able to load balance. It seems that
you should be able to load-balance *any* given
protocol with aid of persistence and fwmark. I'll put
in more time to get it to work, but I just need an
expert's blessing that it's doable.

I am familiar with the austintek FAQ, and have read it
thoroughly.

At this point any help/insight/example is appreciated.

Regards,
Cemil




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