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

Lorenzo Colitti <lorenzo@google.com> Wed, 03 July 2019 22:40 UTC

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From: Lorenzo Colitti <lorenzo@google.com>
Date: Thu, 04 Jul 2019 07:40:16 +0900
Message-ID: <CAKD1Yr1ZKYQ6ZtDZj-uiQg9RTzZzqnKxn=iXGoqDKTs7FRHObQ@mail.gmail.com>
To: Michael Richardson <mcr+ietf@sandelman.ca>
Cc: Jen Linkova <furry13@gmail.com>, 6lo@ietf.org, 6tisch@ietf.org, V6 Ops List <v6ops@ietf.org>, 6man <6man@ietf.org>
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Subject: Re: [6lo] ND cache entries creation on first-hop routers
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On Thu, 4 Jul 2019, 04:00 Michael Richardson, <mcr+ietf@sandelman.ca> wrote:

> Let me suggest a different hack: use stateful DHCPv6.
>

DHCPv6 doesn't fix this because a) DHCP goes to a server, not the router,
b) DHCPv6 uses link-local addresses and not the global addresses, c) there
is nothing in the DHCPv6 specs about explicitly populating ND caches.

For off-link servers, the router can perform layering violations such as
"snoop DHCPv6 replies and add them to the neighbour cache". But such
layering violations don't require DHCPv6. For example, the router can also
snoop DAD packets, or glean ND cache entries from forwarded packets.

>

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