RS sending in draft-ietf-v6ops-ipv6-cpe-router-04

[Wojciech Dec <wdec@cisco.com>]

Hi,

Given that RS triggered access appears to be gaining ground (based on the
latest  draft-krishnan-rs-mark) it would appear that the CPE router draft
specify a bit more tightly the form of RS messages a CPE sends when
connecting to a network.
RFC4861 section 6.3.7 states:
" A host sends Router Solicitations to the all-routers multicast
   address.  The IP source address is set to either one of the
   interface's unicast addresses or the unspecified address."

Now, since the source address is very likely to be one of the identifier
keys for a CPE used for authorization, I would like to propose that an RS
sending rule be added to the CPE spec which would ensure that the IP source
address is NEVER the unspecified address, eg:

The IPv6 CE router MUST use one of its WAN interface unicast addresses when
sending RS messages.

Comments?

-Woj.