Re: [NDP] Router autoconfiguration with RS/RA

2008/6/6 Alexandru Petrescu <alexandru.petrescu@gmail.com>:
> Hemant Singh (shemant) wrote:
>> Silviu,
>>
>> A router can receive an RA on the router's upstream
>
> Yes it can.  It uses it to report whether some things went wrong, log
> stuff, but don't act.
>
>> and use this RA to autoconfigure the ipv6 address on interface(s) of
>>  the router.
>
> Usually no, it can not.  A particular case of a Mobile Router away from
> home can auto-configure an address on its egress interface with
> stateless autoconf.  But a non-mobile router (not implementing rfc3963)
> can't and it shouldn't.
>
> A router is something that forwards packets.  A linux router can't
> auto-configure an address once one sets the forwarding=1.  A Cisco
> router I have doubts, but it doesn't mean it follows rfc.

a router can very well have an interface configured in host mode where
it uses normal host configuration mechanisms. it obviously can't
advertise any learnt information back out the same interface. I don't
see any reason why it couldn't also do forwarding on this interface.

router/host mode is a per interface property.

and has been said before the RS/RA mechanism for router
discovery/prefix discovery does not support prefix delegation. of
course you can invent a new protocol using RS/RA messages to do it,
but I haven't seen any convincing reason why we should. note that the
DHCP PD was triggered by a draft proposing using ICMP for PD. we
suggested using DHCP instead, since one eventually would have
reinvented lots of the DHCP machinery to make it work.

/ot
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