Re: I-D Action:draft-ietf-6man-exthdr-02.txt

Suresh Krishnan <suresh.krishnan@ericsson.com> Tue, 15 March 2011 00:16 UTC

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Date: Mon, 14 Mar 2011 20:14:47 -0400
From: Suresh Krishnan <suresh.krishnan@ericsson.com>
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To: John Leslie <john@jlc.net>
Subject: Re: I-D Action:draft-ietf-6man-exthdr-02.txt
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Hi John,

On 11-03-14 06:55 PM, John Leslie wrote:
> Internet-Drafts@ietf.org <Internet-Drafts@ietf.org> wrote:
>> 	Title           : An uniform format for IPv6 extension headers
>> 	Author(s)       : S. Krishnan, et al.
>> 	Filename        : draft-ietf-6man-exthdr-02.txt
>> 	Pages           : 6
>> 	Date            : 2011-03-14
>>
>> In IPv6, optional internet-layer information is encoded in separate
>> headers that may be placed between the IPv6 header and the transport
>> layer header.  There are a small number of such extension headers
>> currently defined.  This document defines a format for defining new
>> IPv6 extension headers.
> 
>    I notice that Section 4 calls for TLV:
> ] 
> ] 4. Proposed IPv6 Extension Header format
> ] 
> ]  This document proposes that all IPv6 extension headers be encoded in
> ]  a consistent TLV format so that it is possible for nodes to skip over
> ]  unknown extension headers and continue to further process the header
> ]  chain.
> 
>    But I don't see the equivalent of Section 4.2 of RFC 2460, specifying
> the TLV format.

The T is the "Next Header", the L is the "Hdr Ext Len" and V is the 
"Header Specific Data" as specified in the figure in Section 4 of the draft.

Thanks
Suresh