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RE: [NAT] NAT with Windows2000

"Tim Dorcey" <Tim.Dorcey@eyematic.com> Fri, 10 August 2001 21:46 UTC

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Subject: RE: [NAT] NAT with Windows2000
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From: Tim Dorcey <Tim.Dorcey@eyematic.com>
To: Hal F Gottfried <hgottfried@protechpts.com>, nat@ietf.org
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> Now you're ready to configure additional options for NAT.
...

Ah, it sounds like you might be able to answer a question that is near
and dear to my heart.  If a host in the private address space, behind a
Microsoft NAT product, sends a packet from UDP port X to 2 different
hosts in the public address space, will the NAT forward them both from
the same port on the NAT?  Or, will it use a different public port port
for each (private addr,private port,remote addr,remote port)
combination?

I know that with Linux IP Masquerade it will do the latter by default,
or the former if you activate "LOOSE_UDP" option.  I wish I had an
inventory of all NAT product behavior in this regard.

The reason this is important is well explained in "Short term NAT
requirements for UDP based peer-to-peer applications"
<draft-huitema-natreq4udp-00.txt>.

Tim


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