From: David Morton (David.Morton@xxxxxxxxxxxxxxxxxxxxxxxxxx)
Date: Wed Sep 05 2001 - 15:24:50 GMT-3
A couple of thoughts:
1) NAT generally doesn't work with H.323. The problem is that NAT generally
only translates the layer 3 and 4 addresses. The H.323 RAS messages that are
part of the gatekeeper registration include the IP address way up in the
application layer. If you look at the registration debugs on the gatekeeper,
you will notice that it receives the registration request from the gateway's
original address (i.e. 10.1.1.1). The problem is that the RCF (registration
confirmation) is sent to the 10.1.1.1 address rather than the NATed address
and so it never makes it back to the gateway.
2) Newer versions of IOS contain a H.323 aware version of NAT. This version
will also change the application layer address so that it registers with the
gatekeeper with the desired address. I don't recall which IOS contains the
H.323 aware NAT, but a search on CCO should take care of it.
Take care
David
David Morton CCNP, CCDP
Principal Engineer
Open Telecommunications
davidm@ot-usa.com
Tel: 425.482.5122
www.opentelecommunications.com
-----Original Message-----
From: Neil Garcia Legada [mailto:nlegs@visto.com]
Sent: Wednesday, September 05, 2001 8:19 AM
To: ccielab@groupstudy.com
Subject: H323 Gateways and Gatekeepers
Hi Group,
Anybody tried configuring an H323 gateway and gatekeeper with NAT between
them ???
Couldn't seem have the gateway to properly register with the gatekeeper.
I've put in a static mapping of the H323 addresses in the NAT router still
no luck. Debug IP packets showed both are sending/receiving (UDP 1918/1919).
Not too sure what I missed. Worked fine when I removed the NAT router.
Appreciate any feedbacks.
Thanks and regards,
Neil
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