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Re: Compatibility with SRH requirement (was Re: Adoption Call for "The IPv6 Compact Routing Header (CRH)")

John Scudder <jgs@juniper.net> Sat, 30 May 2020 20:29 UTC

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From: John Scudder <jgs@juniper.net>
To: James Guichard <james.n.guichard@futurewei.com>
CC: Tom Herbert <tom@herbertland.com>, Bob Hinden <bob.hinden@gmail.com>, IPv6 List <ipv6@ietf.org>
Subject: Re: Compatibility with SRH requirement (was Re: Adoption Call for "The IPv6 Compact Routing Header (CRH)")
Thread-Topic: Compatibility with SRH requirement (was Re: Adoption Call for "The IPv6 Compact Routing Header (CRH)")
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Jim,

On May 30, 2020, at 3:46 PM, James Guichard <james.n.guichard@futurewei.com<mailto:james.n.guichard@futurewei.com>> wrote:

Further, in normal operation of any source routed solution you will need to make sure that packets end up at the right nodes as nasty things might happen if you don’t - this is actually especially bad with CRH as far as I can tell as if you send a packet to the wrong node and it happens to have a local identifier the same as the incoming packet its going to use that local CRH-FIB entry and send the packet to some IPv6 destination that was not the intended recipient.

I think you’re mistaken, or at least the situation you describe is far more pathological than the one Tom described and you’re dismissing. Consider that in order for what you say to happen, the incoming packet would have to have, as its destination address, an address of the “wrong node”. You can’t just send the packet out the wrong interface and have its CRH identifier misconstrued by any old router that touches it, the DA has to identify the node that receives it.

So now, by definition, you’re saying that two different nodes in the same network have the same (non link-local, also by definition) address. That’s a broken network, of course it’s doing broken things. Alternately, you didn’t mean to say that, and are mistaken about CRH processing.

—John

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