Port preservation

"Yutaka Takeda" <[email protected]>
Newsgroups gmane.ietf.midcom
Message-ID <[email protected]>
Does anyone know what the real motivation for NAT designers to 
implement the port preservation[1] is? Is there an actual service 
or application that depends on this behavior? I just realized that 
I know such NATs exist but why...

[1] http://www.ietf.org/internet-drafts/draft-jennings-midcom-stun-results-00.txt

Yutaka
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