Re: [CGA-EXT] Review of draft-ietf-csi-proxy-send

"Laganier, Julien" <julienl@qualcomm.com> Thu, 04 March 2010 16:12 UTC

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From: "Laganier, Julien" <julienl@qualcomm.com>
To: Jari Arkko <jari.arkko@piuha.net>, "draft-ietf-csi-proxy-send@tools.ietf.org" <draft-ietf-csi-proxy-send@tools.ietf.org>, "cga-ext@ietf.org" <cga-ext@ietf.org>
Date: Thu, 4 Mar 2010 08:12:21 -0800
Thread-Topic: [CGA-EXT] Review of draft-ietf-csi-proxy-send
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Subject: Re: [CGA-EXT] Review of draft-ietf-csi-proxy-send
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Jari,

> [...]
> 
> >
> >   Sharing the same link-local address on different MAGs would
> >   require all MAGs of a PMIPv6 domain to construct the CGA and the
> >   RSA Signature option with the same public-private key pair, which
> >   is not acceptable from a security point of view.
> >
> 
> AFAIK there is no requirement that routers construct CGAs.

If the router does not construct a CGA it will not be able to send secure Neighbor Advertisement messages for its own address, as per RFC3971: 

   Neighbor Solicitation and Advertisement messages without the CGA
   option MUST be treated as unsecured

Since the router does need to send Neighbor Advertisements for its own address whenever a host on the link initiates Neighbor Unreachability Detection, it seems to me that there is indeed a requirement that a router constructs a CGA as per RFC3971. I am missing something?

--julien