RE: [cobalt-users] Qube3 and MSN Messenger

[BSmith@xxxxxxxxxxx]

-----Original Message-----
From: James Nesbitt (IHQ Network) 
Subject: [cobalt-users] Qube3 and MSN Messenger


We are using the Web Caching on our Qube3 to give access to give internet
access to the people on the internal lan.  I haave got the DHCP Service to
give the internal IP address of the Qube3 as the Gateway so programs that
don't have the option of using proxy settings can also gain access if need
be.

I have not enabled the Firewall on the Qube3.

Any ideas on how to tell the Qube3 to allow MSN Messenger's Webcam and Audio
features to work?

Regards,

James Nesbitt
_____________________________________


This is an extremely common problem when doing Voice Over & Video 
Over IP, when you introduce NAT into the picture.

What is wrong is this:

When you go to connect, or someone connects to you, your IP address 
(in this case, it is private), gets wrapped up in the data portion 
of the IP packet.

When you send it through a NAT interface, 99.9% of the times NAT 
will only fix the outside IP header, and ignores the payload of the 
packet.  That is why they created application proxy modules to 
handle this problem.  The module, which runs in the Kernel Level, 
actually checks the payload and if there is an IP address in the 
payload, it will encapsulate that as well.

As far as using IPMASQADMIN to forward ports back in, that will 
work for just 1 user.  What happens if you want 10 users?  It no 
workie joe!

Take a look at:
http://rpmfind.net/linux/RPM/PLD/dists/ra/PLD/i386/PLD/RPMS/kernel-net-ip_ma
sq_h323-2.2.20-10@xxxxxxxxxxxxxxxxxx

I was trying to find a better doc, but I can not.  Search for H323 
& ipchains or include Netmeeting.  You will have good luck searching 
with that info, I hope :)  But, it will take you down the road you 
want to go down!

Thanks,
Brian