Re: [v6ops] Security: Unique IPv6 Prefix per Host

Fernando Gont <fgont@si6networks.com> Tue, 31 October 2017 13:23 UTC

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To: Lorenzo Colitti <lorenzo@google.com>
Cc: Ted Lemon <mellon@fugue.com>, "v6ops@ietf.org WG" <v6ops@ietf.org>, draft-ietf-v6ops-unique-ipv6-prefix-per-host@tools.ietf.org
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From: Fernando Gont <fgont@si6networks.com>
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Date: Tue, 31 Oct 2017 10:20:04 -0300
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Subject: Re: [v6ops] Security: Unique IPv6 Prefix per Host
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On 10/30/2017 10:49 PM, Lorenzo Colitti wrote:
> On Tue, Oct 31, 2017 at 12:57 AM, Fernando Gont <fgont@si6networks.com
> <mailto:fgont@si6networks.com>> wrote:
> 
>     > I think the document is actually a bit vague in general, and I wish I'd
>     > given it a close review earlier.   One example of this vagueness is that
>     > the document seems to be saying that the router will spontaneously send
>     > RAs after the initial solicited RA,
> 
>     "Unicasted" per-pefix RAs? Does the router need to remember which
>     prefixes it has "handed"?
> 
> 
> Sending RAs is documented very clearly in the draft:
> 
>    When the First Hop Router sends a solicited RA response, or
>    periodically sends unsolicited RAs, the RA MUST be sent only to the
>    subscriber that has been assigned the Unique IPv6 prefix contained in
>    the RA.  This is achieved by sending a solicited RA response or
>    unsolicited RAs to the all-nodes group, as detailed in RFC4861
>    [RFC4861] section 6.2.4 and 6.2.6, but instead of using the link-
>    layer multicast address associated with the all-nodes group, the
>    link-layer unicast address of the subscriber that has been assigned
>    the Unique IPv6 prefix contained in the RA MUST be used as the link-
>    layer destination RFC6085 [RFC6085].  Or, optionally in some cases,
>  
> but the router always needs to remember this information anyway, because
> otherwise it doesn't know who to send packets to.

I have two questions:

1) Isn't this a protocol spec?

2) If a router needs to "remember" this... isn't this kind of stateful
slaac?

Thanks,
-- 
Fernando Gont
SI6 Networks
e-mail: fgont@si6networks.com
PGP Fingerprint: 6666 31C6 D484 63B2 8FB1 E3C4 AE25 0D55 1D4E 7492