Re: [v6ops] Extension Headers / Impact on Security Devices

Joe Touch <touch@isi.edu> Wed, 27 May 2015 00:33 UTC

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Date: Tue, 26 May 2015 17:32:28 -0700
From: Joe Touch <touch@isi.edu>
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To: Brian E Carpenter <brian.e.carpenter@gmail.com>, v6ops@ietf.org
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Subject: Re: [v6ops] Extension Headers / Impact on Security Devices
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On 5/26/2015 5:23 PM, Brian E Carpenter wrote:
> On 27/05/2015 11:56, Joe Touch wrote:
...
>> FWIW, I don't see anything that prohibits adding headers either.
> 
> "With one exception, extension headers are not examined or processed
> by any node along a packet's delivery path, until the packet reaches
> the node (or each of the set of nodes, in the case of multicast)
> identified in the Destination Address field of the IPv6 header."
> 
> To me that clearly implies not adding (which is a form of processing).

The "one exception" are HBH headers - as a class.

I.e., this is just restating that non-HBH header classes don't change
en-route. It doesn't prohibit adding/removing HBH headers, but gives no
examples because the only HBH header types defined by 2460 are NOP fillers.

Joe