Re: Hop-by-hop options [Re: Routing directorate review of draft-ietf-6man-rfc2460bis]

Tom Herbert <tom@herbertland.com> Thu, 02 March 2017 21:36 UTC

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From: Tom Herbert <tom@herbertland.com>
Date: Thu, 2 Mar 2017 13:36:36 -0800
Message-ID: <CALx6S35DPToXd1eSXckWDmA1tX-xRy_F_jiOcCV5jQw1vA57pA@mail.gmail.com>
Subject: Re: Hop-by-hop options [Re: Routing directorate review of draft-ietf-6man-rfc2460bis]
To: Brian E Carpenter <brian.e.carpenter@gmail.com>
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On Thu, Mar 2, 2017 at 1:25 PM, Brian E Carpenter
<brian.e.carpenter@gmail.com>; wrote:
> On 03/03/2017 10:02, Papadimitriou, Dimitri (Nokia - BE) wrote:
> ...
>> Section 4.8: states "New hop-by-hop options are not recommended because nodes may be configured to ignore the Hop-by-Hop Option header, drop packets containing a hop-by-hop header" does this configuration change because options are new or old ? there seems to be confusion here between "new vs. existing" options and "intermediate nodes MAY be configured to ignore/drop packets with these options included".
>
> Middleboxes *might* be configured to do something sensible with existing HbH options (such as ignoring them) and something annoying with unknown new ones (such as kicking them to the slow path or dropping the packet). So yes, the situation is worse for new options than for ones that have been defined years ago. But they are both risky.
>
Right, but in the current state of things any EH has proven hard to
successfully deploy in practice. IMO it's more of an implementation
problem that needs to be addressed rather than a protocol
specification problem. If the recommendation is to not create new HBH
options because of this it seems like this affirms protocol
ossification and maybe we've lost the battle!

Tom