RE: Another requirement [Re: New (-02) version of IPv6 CPE Router draft is available for review]

["Wes Beebee (wbeebee)" <wbeebee@cisco.com>]

There may be problem with precedence if the PD is a /64 and there is one
LAN port that's a /64,
you'd have to make sure that the null route was lower precedence than
the LAN port otherwise
you might not have connectivity.  So yes, we do need to specify that the
null route is lower 
precedence than other routes except for the default route.

- Wes

-----Original Message-----
From: Francois-Xavier Le Bail [mailto:fx.lebail@yahoo.com] 
Sent: Thursday, July 31, 2008 11:33 AM
To: v6ops@ops.ietf.org; Wes Beebee (wbeebee)
Subject: RE: Another requirement [Re: New (-02) version of IPv6 CPE
Router draft is available for review]

--- On Thu, 7/31/08, Wes Beebee (wbeebee) <wbeebee@cisco.com> wrote:
> Agreed.  Perhaps a low precedence route (when all else but the default

> route fails to match) that's a null route would be desirable..

Yes, and with the Good Old "Longest prefix match", no problem of
precedence.

Francois-Xavier

> -----Original Message-----
> From: Francois-Xavier Le Bail [mailto:fx.lebail@yahoo.com]
> Sent: Thursday, July 31, 2008 11:12 AM
> To: v6ops@ops.ietf.org; Wes Beebee (wbeebee)
> Subject: RE: Another requirement [Re: New (-02) version of
> IPv6 CPE
> Router draft is available for review]
> 
> --- On Thu, 7/31/08, Wes Beebee (wbeebee) <wbeebee@cisco.com> wrote:
> > The route should go to the LAN ports (for the delegate
> prefix).  If
> > the LAN ports happen to not be up, doesn't this
> cause the packet to be
> 
> > > dropped?  If the destination matches a loopback,
> then the packets
> > can be serviced by the loopback.  If there is no LAN
> port (# of LAN
> > ports = 0), and if the device still does DHCPv6 PD
> (for other
> > addresses), then a null route may be appropriate as
> long as the other
> > addresses get serviced at a higher priority.
> 
> For example, if the delegated prefix is a /56 and the CPE use a /64 
> prefix for a subnet on a LAN Bridge and another /64 for a subnet on 
> another LAN interface outside the bridge, there are many prefix/subnet

> not used.
> 
> Packet to theses unused prefix/subnet will loop without a discard or 
> unreachable route.
> 
> Francois-Xavier
> 
> > -----Original Message-----
> > From: owner-v6ops@ops.ietf.org
> > [mailto:owner-v6ops@ops.ietf.org] On Behalf Of Francois-Xavier Le 
> > Bail
> > Sent: Thursday, July 31, 2008 10:17 AM
> > To: v6ops@ops.ietf.org
> > Subject: Another requirement [Re: New (-02) version of
> IPv6 CPE Router
> 
> > draft is available for review]
> > 
> > Another requirement:
> > 
> > The CPE should install a discard (null) or unreachable
> route for the
> > delegated prefix.
> > 
> > Without, a packet to an unused subnet (belonging to
> the delegated
> > prefix) will loop between the CPE (default route to
> the Edge Router)
> > and the Edge Router (route for the delegated prefix to
> the CPE).
> > 
> > The only difference between the two options is: with
> unreachable route
> 
> > the CPE return ICMPv6 "Destination Unreachable/no
> route to
> > destination"
> > message to the source address instead of only silently
> discard the
> > packet.
> > 
> > Francois-Xavier