What is Symmetric NAT?

  • Thread starter Thread starter Paul Westwell
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Paul Westwell

Hi,

What is the difference between NAT and Symmetric NAT and how might this
effect MSN messenger?

Regards,

Paul
 
Greetings Paul,

There are several types of NATs, based upon how exactly the "NAT" operations are being
performed. A symmetric NAT is one in which all requests from the same internal IP and port
to a specific destination are mapped to the esame external IP address and port.

In MSN Messenger 6.1 and above (not sure if 7 changes any of this yet), for features that
require a direct connection (to either work or work well) Symmetric NATs are not supported
unless they support UPnP.
____________________________________________
Jonathan Kay
Microsoft MVP - Windows Messenger/MSN Messenger
Associate Expert
http://www.microsoft.com/windowsxp/expertzone/
Messenger Resources - http://messenger.jonathankay.com
All posts unless otherwise specified are (c) 2004 Jonathan Kay.
You *must* contact me for redistribution rights.
 
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