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

"Eric Vyncke (evyncke)" <evyncke@cisco.com> Thu, 28 May 2015 15:26 UTC

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From: "Eric Vyncke (evyncke)" <evyncke@cisco.com>
To: Gert Doering <gert@space.net>, Brian E Carpenter <brian.e.carpenter@gmail.com>
Thread-Topic: [v6ops] Extension Headers / Impact on Security Devices
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Date: Thu, 28 May 2015 15:26:06 +0000
Message-ID: <D18CFF39.4C411%evyncke@cisco.com>
References: <555AB8FA.2080405@si6networks.com> <F6AA9AEA-49F0-488C-84EA-50BE103987C8@nominum.com> <555B8622.5000806@isi.edu> <555BA184.8080701@gmail.com> <555BA43F.8010303@isi.edu> <5564FB74.5020303@gmail.com> <5564FE3F.4050102@isi.edu> <556503CF.4030101@gmail.com> <55650821.4060907@isi.edu> <55650E82.3090407@gmail.com> <20150527073943.GA54385@Space.Net>
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Cc: "Mark Townsley (townsley)" <townsley@cisco.com>, "v6ops@ietf.org" <v6ops@ietf.org>, "Stefano Previdi (sprevidi)" <sprevidi@cisco.com>
Subject: Re: [v6ops] Extension Headers / Impact on Security Devices
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Segment Routing Header is currently drafted as another type of routing
header and are drafted to be inserted either by the source or by the
ingress router of a SR-configured domain (then being removed at the exit
of the SR-domain). Destination Option is not useful here as it is
inspected/processed only by the destination while the intent of SR is to
have this information processed by a couple of intermediate routers (which
have a specific configuration as SRH is not enabled by default).

Of course, this causes MTU issues (pretty much like MPLS but at a
different layer) within one domain which is solvable. The performance
issues need to be handled (as Joe wrote). But, as long as the pros/cons
balance is on the pro side, then it is valuable.

-éric


On 27/05/15 09:39, "Gert Doering" <gert@space.net> wrote:

>Hi,
>
>On Wed, May 27, 2015 at 12:23:30PM +1200, Brian E Carpenter 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).
>
>So how do the SR folks handle that?  From what I heard, the intended
>deployment really is "inside your administrative domain, SR headers get
>added, processed, and when the packet leaves your domain, they can be
>(optionally) removed again to not upset your neighbours"...
>
>Gert Doering
>        -- NetMaster
>-- 
>have you enabled IPv6 on something today...?
>
>SpaceNet AG                        Vorstand: Sebastian v. Bomhard
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