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Re: [6lo] ND cache entries creation on first-hop routers

"Pascal Thubert (pthubert)" <pthubert@cisco.com> Wed, 03 July 2019 21:03 UTC

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From: "Pascal Thubert (pthubert)" <pthubert@cisco.com>
To: Brian E Carpenter <brian.e.carpenter@gmail.com>
CC: Michael Richardson <mcr+ietf@sandelman.ca>, "6lo@ietf.org" <6lo@ietf.org>, Jen Linkova <furry13@gmail.com>, "6tisch@ietf.org" <6tisch@ietf.org>, V6 Ops List <v6ops@ietf.org>, 6man <6man@ietf.org>
Thread-Topic: [6lo] ND cache entries creation on first-hop routers
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Date: Wed, 03 Jul 2019 21:03:15 +0000
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Subject: Re: [6lo] ND cache entries creation on first-hop routers
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Sorry Brian I miss your point.

The discussion here is to find a way for the node to autoconf an address and then notice the router(s) proactively so the ND NCE is ready when the first packet comes from the outside for this node.

I agree wholeheartedly with Jen’s requirement.

I agree less with the idea of overstretching ND as it stands to achieve this, for reasons I gave already. So prepopulate the NCE, yes, but do it right with protocol elements that guarantee a state that is accurate, secure, and persistent for a committed lifetime, not with yet another patch to the old structure.

I’m interested to have a parallel discussion on where RFC 8505 can not apply. In the products and use cases I’m aware of, it could, since we are actually faking it by snooping ND and DHCP to achieve similar but less accurate results.

Take care,

Pascal

> Le 3 juil. 2019 à 22:39, Brian E Carpenter <brian.e.carpenter@gmail.com> a écrit :
> 
> On 03-Jul-19 20:13, Pascal Thubert (pthubert) wrote:
> 
> ...
>> I'm baffled that the reactive ND is still the official technique for IPv6 lookup at 6MAN.
> 
> How can it be otherwise when a node can give itself a new address at any time without notice?
> 
> I'm not arguing with you about RFC 6775/8505 networks, but that doesn't apply everywhere.
> 
>    Brian

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