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

On Thu, 31 Jul 2008, Francois-Xavier Le Bail wrote:


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.

This would definately be a good idea for the first CPE router that gets 
delegated the big block of /56 or /48 (whatever) from the ISP.  But what 
if it's one of the cascaded routers farther downstream?  Some intelligent 
decisions would need to be made by the router - particularly the amount of 
address space to re-sub-delegate (if that's the right term) to downstream 
routers.

Antonio Querubin
whois:  AQ7-ARIN