Re: [v6ops] draft-ietf-6man-grand : saving lookups

"Templin (US), Fred L" <> Tue, 11 August 2020 17:20 UTC

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From: "Templin (US), Fred L" <>
To: Ted Lemon <>
CC: Bob Hinden <>, Nick Hilliard <>, "" <>, IPv6 List <>
Thread-Topic: [v6ops] draft-ietf-6man-grand : saving lookups
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Date: Tue, 11 Aug 2020 17:20:11 +0000
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Subject: Re: [v6ops] draft-ietf-6man-grand : saving lookups
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Hi Ted,

Indeed, I was not expressing this as a criticism. I wonder if there’s a way to get that kind of reduction for regular NS/NA pairs. I think for the “I want to send a packet to foo” case, this is easy; the question is, what about during SLAAC?

I have more or less punted on the subject of SLAAC and consider the NBMA links I am
dealing with as link-local-only. SLAAC brings the problem of what to do about DAD
and MLD. I think on-link prefixes on large NBMA links are an unnecessary burden
and should be avoided – do you see it differently?

Address resolution is a different question, though; if a node on the NBMA link wants
to resolve the address of a subnet router for a target destination it can send NS(AR)
to the solicited-node multicast address corresponding to the target. The “multicast”
will then go to exactly one node, which is the target subnet router, and the resultant
NA(AR) is unicast back to the (single) node that sent the NS. Very efficient, and
again without disturbing the massive numbers of other nodes on the link.

Thanks - Fred