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Re: Application protocols and Address Translation

From: Patrik Fältström <paf@cisco.com>
Date: Mon, 2 Dec 2002 18:14:35 +0100
Cc: Eliot Lear <lear@cisco.com>, discuss@apps.ietf.org
To: Brian E Carpenter <brian@hursley.ibm.com>
Message-Id: <87C296E4-0619-11D7-A024-0003934B2128@cisco.com>

On måndag, dec 2, 2002, at 16:06 Europe/Stockholm, Brian E Carpenter 
wrote:

> 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.

   paf
Received on Monday, 2 December 2002 12:15:41 EST

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