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Re: [Softwires] draft-penno-softwire-sdnat vs. draft-cui-softwire-b4-translated-ds-lite

Alain Durand <adurand@juniper.net> Thu, 15 March 2012 16:49 UTC

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From: Alain Durand <adurand@juniper.net>
To: Francis Dupont <Francis.Dupont@fdupont.fr>
Date: Thu, 15 Mar 2012 09:48:20 -0700
Thread-Topic: [Softwires] draft-penno-softwire-sdnat vs. draft-cui-softwire-b4-translated-ds-lite
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Cc: Softwires WG <softwires@ietf.org>, draft-cui-softwire-b4-translated-ds-lite <draft-cui-softwire-b4-translated-ds-lite@tools.ietf.org>, "draft-penno-softwire-sdnat@tools.ietf.org" <draft-penno-softwire-sdnat@tools.ietf.org>
Subject: Re: [Softwires] draft-penno-softwire-sdnat vs. draft-cui-softwire-b4-translated-ds-lite
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On Mar 14, 2012, at 2:34 PM, Francis Dupont wrote:

> In your previous mail you wrote:
> 
>> However, the draft seems give people impression there is only one NAT
>> at CPE(i.e. 2.3.  Stateless DS-Lite CPE operation) and AFTR is
>> responsible for decapsulation and IPv4 package validation.  Did I miss
>> something?
> 
> => yes, the SD-CGN (the SD-AFTR with DS-Lite) runs a second NAT but
> only on port (vs. address and port) and following algorithm (aka stateless).

This 2nd NAT was the case in sdnat-01. This has changed in sdnat-02, where the SD-CPE
pre-shape IPv4 traffic with both address & port, so the SD-AFTR does only decapsulation
and ACL check. No NAT is done at all in the SD-AFTR.

   - Alain.

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