W3C home > Mailing lists > Public > ietf-discuss@w3.org > December 2002

Re: Application protocols and Address Translation

From: Keith Moore <moore@cs.utk.edu>
Date: Mon, 02 Dec 2002 14:44:34 -0500
Message-Id: <200212021944.gB2JiYj15278@astro.cs.utk.edu>
To: Patrik Fältström <paf@cisco.com>
cc: Brian E Carpenter <brian@hursley.ibm.com>, Eliot Lear <lear@cisco.com>, discuss@apps.ietf.org

> > The question is, what are the applications-specific arguments
> > against translated addresses? What are the brokenness conditions
> > caused by translated addresses (and the associated statefulness)?
> 
> FTP, SIP and DNS are three protocols which have problems. Or not really
> SIP but anything which uses RTP and is launched by an SDP specification.
> 
> Or, if you look at the situation when more than one host share one IP
> address (not really address translation, but anyway, the normal way NAT
> is implemented -- as 1:N mappings) and you have more than one host
> listening for incoming connections, like an SMTP server.

see:

http://www.cs.utk.edu/~moore/what-nats-break.html
and also section 1.1 of 
http://www.cs.utk.edu/~moore/I-D/draft-moore-nat-tolerance-recommendations-00.txt
Received on Monday, 2 December 2002 14:45:18 EST

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