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

["Templin, Fred L" <Fred.L.Templin@boeing.com>]

>-----Original Message-----
>From: Francois-Xavier Le Bail [mailto:fx.lebail@yahoo.com] 
>Sent: Thursday, July 31, 2008 8:12 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.

But is this so surprising? Any requesting router that is
delegated a prefix is implicitly responsible for proper
stewardship of the prefix; this is not specific to just
the CPE router case.

So, is any additional specification needed and (if so)
should it be done here or within a broader context?
  
Fred
fred.l.templin@boeing.com

>
>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
>
>
>      
>
>