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Video-call session and NAT-router doesn't work

Posted on 2002-06-05
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Last Modified: 2012-08-13
Can someone help me? I'm trying to do an XP Messenger videocall session between a distant room and my home and it does not work - connection is not set up.
I think this is due to the fact that I have a router and NAT.

Does anyone have experience with this? Any suggestions to solve the problem? (no, getting rid of my router is not an option...)
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Question by:geertrobberechts
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Expert Comment

by:mbruner
ID: 7057578
You are right.  Streaming multimedia does have issues with NAT and PAT.  Many routers simply don't support multimedia apps (e.g. NetMeeting) with NAT or PAT involved.  

What kind of router are you using?  It may be possible to get it to work, but we can't tell until we know what we are dealing with.

If it is a Cisco router, you may want to try upgrading the IOS code to add the firewall feature set.  You could then use CBAC and the "ip inspect name <some_name> netshow" or "ip inspect name <some_name> h323" commands to help you to get this working.

Anyway, let us know about your router info.  Maybe there is a solution.

Good luck!!  =)
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Accepted Solution

by:
sherpajj earned 100 total points
ID: 7137163
One possible solution:

Use a Linksys router (any of them) and hard-code your IP numbers into each computer.

You'll need a linksys router, but they start at $75, and they are great becuase they support a DMZ and port forwarding.

Step 1:
Setup the linksys and go ahead and leave NAT on.
You can also (optional) setup port forwarding to make one of the computer available to the outside world for calls.

Hard code the IP address into each computer.  This way they do not change and one computer can reach anouther via it's IP.  I think the port you need for MSN Messenger Service is TCP Port 1863.  Also you need TCP and UDP port 6901 for voice.  Forward both these ports to ip 192.168.1.10

Check these links for more info:
http://www.chebucto.ns.ca/~rakerman/port-table.html#WinMess

http://support.microsoft.com/default.aspx?scid=kb;EN-US;q278887

Step 2:
Here is the setting for the first computer (the one that can be reached by the outside world):
192.168.1.10  IP address
192.168.1.1  Gateway/router
255.255.255.0 sub net mask
(you'll need to get your iSP's DNS numbers from the Status page of the Linksys router (you can log-in with htttp://192.168.1.1).

When trying to reach this computer from the outside world just use the IP of your router.  If your IP changes, download dynamic IP software from www.no-ip.com.

Step 3:
Set the rest of your computer to IP such as:
192.168.1.11  (.12, .13 , etc)


- Jay
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