Subject: (ngtrans) diff-serv comment 2 on transition mechanisms

From: Erik Nordmark <[email-masked]>
Date: Wed, 21 Apr 1999 13:37:51 -0700 (PDT)

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Date: Mon, 12 Apr 1999 09:29:46 +0100
From: "Brian E Carpenter" <[email-masked]>
Subject: Re: ECN: Tunnel/SA relationship
To: "Erik Nordmark" <[email-masked]>
Cc: "Black, David" <[email-masked]>, "'Jun-ichiro itojun Hagino'"
<[email-masked]>, [email-masked], [email-masked],
"[email-masked]'" <[email-masked]>

Aargh. Good catch. We have a problem.

The encapsulation/decapsulation text is wrong. It says the 
encapsulating IPv4 header has TOS=0 and that it is simply
is discarded upon decapsulation.

Suggestion:

> 3.5.  IPv4 Header Construction
..
>         Type of Service:
>                0

becomes
                0 unless otherwise required by Differentiated
                Services [RFC 2474, RFC 2475].

> 3.6.  Decapsulation
...
> The encapsulating IPv4 header is discarded. 

becomes
 The encapsulating IPv4 header is discarded unless otherwise 
 required by Differentiated Services [RFC 2474, RFC 2475].

I can't suggest anything for ECN since it isn't standards track
and you would have an ugly dependency problem.

   Brian

Erik Nordmark wrote:
> 
> The update to RFC 1933 (draft-ietf-ngtrans-mech-02.txt) is currently
> in IETF last call. So if there is a strong reason for changing the behavior
> for the DSCP or ECN bits now is the time to make your voices heard!
> 
>   Erik
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