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Re: [v6ops] WG Doc? draft-gont-v6ops-ipv6-ehs-packet-drops

Brian E Carpenter <brian.e.carpenter@gmail.com> Mon, 28 March 2016 22:21 UTC

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To: "Fred Baker (fred)" <fred@cisco.com>, "touch@isi.edu" <touch@isi.edu>
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From: Brian E Carpenter <brian.e.carpenter@gmail.com>
Organization: University of Auckland
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Date: Tue, 29 Mar 2016 11:21:07 +1300
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Subject: Re: [v6ops] WG Doc? draft-gont-v6ops-ipv6-ehs-packet-drops
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On 29/03/2016 10:36, Fred Baker (fred) wrote:
> 
> On Mar 28, 2016, at 2:29 PM, touch@isi.edu wrote:
>> Note, however, that the idea of an offset to "jump" to the transport
>> header makes no sense. There's no rule that HBH header lengths never
>> change in transit, which means you just end up with another field that
>> might be inconsistent with the actual header.
> 
> Don't tell the 6man chairs. They think that changing the length of a HBH header (or any header) in transit would be a problem, and I can confirm that in the event that there is an AH header in the packet. We had that discussion in 6man at IETF 94.

In any case, that issue is foreseen in
https://tools.ietf.org/html/draft-zhang-6man-offset-option-01#section-6

By the way, would an incorrect offset option be any more harmful
than an incorrect IHL (with a correponding checksum) in IPv4?

  Brian

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