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Re: 6MAN Adoption call on raft-chakrabarti-nordmark-6man-efficient-nd-04

Mark ZZZ Smith <markzzzsmith@yahoo.com.au> Tue, 19 November 2013 19:23 UTC

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Date: Tue, 19 Nov 2013 11:23:13 -0800
From: Mark ZZZ Smith <markzzzsmith@yahoo.com.au>
Subject: Re: 6MAN Adoption call on raft-chakrabarti-nordmark-6man-efficient-nd-04
To: Erik Nordmark <nordmark@acm.org>, Dan Luedtke <maildanrl@gmail.com>, Ole Troan <otroan@employees.org>
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Cc: 6man Chairs <6man-chairs@tools.ietf.org>, 6man WG <ipv6@ietf.org>
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----- Original Message -----
> From: Erik Nordmark <nordmark@acm.org>
> To: Dan Luedtke <maildanrl@gmail.com>; Ole Troan <otroan@employees.org>
> Cc: 6man Chairs <6man-chairs@tools.ietf.org>; 6man WG <ipv6@ietf.org>
> Sent: Wednesday, 20 November 2013 5:59 AM
> Subject: Re: 6MAN Adoption call on raft-chakrabarti-nordmark-6man-efficient-nd-04
> 
> [Sorry about responding to the wrong thread.]
> 
> 
> Dan,
> 
> Thanks for your review comments.
> 
> If MLD-snooping was implemented in every L2 device (not just switches,
> but also wireless access points, etc) then the impact of multicast NSs
> sent for the purposes of address resolution would be reduced.
> 
> But the draft is also addressing the other cases of multicast:
>   - periodic RAs
>   - multicast NS/NA for the purposes of duplicate address detection
>   - a host sending a multicast NS to its peer when the routers already
> know the MAC address of the peer; redirect messages solve that without
> any multicasts
> 
> All of those current uses of multicast are part of the motivation for
> the draft. The other part of the motivation is to facilitate sleeping
> hosts. If you follow the letter in RFC 4861/62 hosts have to be always
> be awake to respond to any DAD probe that might arrive, or the hosts
> have to redo multicast DAD each time they wake up. Finally having
> registrations in the routers provides a standardized approach of
> avoiding ND DoS attacks.
> 

It is also a method of preventing source address spoofing towards off-link victims. The router could refuse to forward packets for which the source address isn't registered and therefore validated as present.


Regards,
Mark.

<snip>

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