RE: CPE router learning DNS servers - comment on draft-ietf-v6ops-ipv6-cpe-router-03

["Dan Wing" <dwing@cisco.com>]

> -----Original Message-----
> From: STARK, BARBARA H (ATTLABS) [mailto:bs7652@att.com] 
> Sent: Monday, January 11, 2010 11:37 AM
> To: Dan Wing; 
> draft-ietf-v6ops-ipv6-cpe-router@tools.ietf.org; v6ops@ops.ietf.org
> Subject: RE: CPE router learning DNS servers - comment on 
> draft-ietf-v6ops-ipv6-cpe-router-03
> 
> The L-6 requirement is a LAN-side (DHCPv6 Server) 
> requirement.

You're right; my misread.

> However, since SLAAC is the expected method for address config in 
> the LAN, and support for DHCPv6 DNS_SERVERS option is a MUST (and 
> other options is a SHOULD), I think that the MAY statement for 
> stateless DHCPv6 support might not be completely consistent.

Agreed - we certainly need a way for the hosts to learn their
IPv6 DNS servers.  And it should agree with RFC4339 and RFC5505
(neither of which are cited by draft-ietf-v6ops-ipv6-cpe-router-03).

> As for the WAN-side (DHCPv6 client), there's currently no mention of
> stateless DHCPv6. It does seem implied by other requirements that
> describe support for SLAAC + the ability to get other config info via
> DHCPv6. It might be good to be more explicit on this.

Thanks.
-d


> Barbara
> 
> > -----Original Message-----
> > From: Dan Wing [mailto:dwing@cisco.com]
> ...
> > and I see that draft-ietf-v6ops-ipv6-cpe-router-03 only says:
> > 
> >    L-6:   The IPv6 CE router MUST support a DHCP server [RFC3315] on
> > its
> >           LAN interfaces.  It MAY support Stateless Dynamic Host
> >                               ^^^
> >           Configuration Protocol (DHCP) Service for IPv6 [RFC3736].
> > 
> > 
> > Why is that only a MAY?  I mean, without the CE doing DHCPv6 towards
> > the Service Provider's network, is there some other way the 
> CE router
> > learns the IPv6 network's DNS servers so it can propagate those
> > DNS servers to hosts connecting to the CE router?  (I hope 
> the answer
> > is not 'manual configuration').
> > 
> > -d
> 
> 
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