RE: [cobalt-users] Qube3 and MSN Messenger

["James Nesbitt \(IHQ Network\)" <ihq-network@xxxxxxx>]

This sounds crazy!  What a pity that I need to be able to make it work for
more than 1 user.....   *sigh*

Regards,

James Nesbitt


-----Original Message-----
From: cobalt-users-admin@xxxxxxxxxxxxxxx
[mailto:cobalt-users-admin@xxxxxxxxxxxxxxx]On Behalf Of
BSmith@xxxxxxxxxxx
Sent: Wednesday, July 23, 2003 01:18
To: cobalt-users@xxxxxxxxxxxxxxx
Subject: RE: [cobalt-users] Qube3 and MSN Messenger




-----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

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