Re: [v6ops] new draft: draft-yc-v6ops-solicited-ra-unicast

Erik Kline <ek@google.com> Mon, 20 July 2015 17:04 UTC

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From: Erik Kline <ek@google.com>
Date: Mon, 20 Jul 2015 19:04:14 +0200
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To: Lorenzo Colitti <lorenzo@google.com>
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Cc: "draft-yc-v6ops-solicited-ra-unicast@tools.ietf.org" <draft-yc-v6ops-solicited-ra-unicast@tools.ietf.org>, v6ops list <v6ops@ietf.org>
Subject: Re: [v6ops] new draft: draft-yc-v6ops-solicited-ra-unicast
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>>     - unicast RAs MAY be sent at any time, whether solicited or not
>
>
> What's the use case for a unicast unsolicited RA? They can only reach nodes
> for which the router knows the IPv6 addresses, and so pretty much require
> that routers keep a lot of state.

Yes, and these routers exist.  The M2M stuff I scanned in 3GPP has
nodes that sleep on a schedule and the network knows when they're
supposed to wake up (and they have to wake up periodically if only to
sync their clocks with the network).