h323-conntrack-nat and NetMeeting - Question

Setup:

Windows2000 SP3 with NetMeeting 3.01 behind a RedHat 7.3 firewall with kernel 2.4.20 from kernel.org plus the newnat-udp-helper and h323-conntrack-nat patches from POM (z-newnat16 showed as 'already applied').

I am able to initiate outgoing NetMeeting connections. However, when I initiate such a connection, I do not receive video from the other party. I don't currently have a camera so I can't tell if outgoing video works.

Here are the symptoms:

1) No video window appears, even though "Video/Receive" and "Automatically receive video" are both enabled in NetMeeting. The other party has a proven working setup that is used regularly for audio/video with other people, so that's not in question.

2) Even when I have a good audio connection to the other party, and the main NetMeeting window displays "In a call", the sharing tools (share app, chat, whiteboard and file transfer) all display "Not in a call" in their title bars, and don't transmit or receive data.

In addition to installing the POM patches I have configured iptables to allow all traffic between my host and the specific remote IP address of the other party.

Anyone have suggestions on how to fix and/or debug this further?

I have ethereal on the firewall and am relatively adept at interpreting its output, though I don't know much about the specific protocols used in NetMeeting. I assume that both the audio and video streams are sent in UDP packets. What do I look for in the data stream to tell if I'm even receiving video? Is it possible to tell by examining the packets?

Jim Garrison ([email protected])
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