v6 subnet size for DSL & leased line customers

Mikael Abrahamsson swmike at swm.pp.se
Sun Dec 23 06:59:02 UTC 2007

On Sat, 22 Dec 2007, Joel Jaeggli wrote:

> Leave enough address space for pd to occur? We know that if I hand you
> the end-user a /64 that the first device that you connect to the network

What about the "wan" side of that connection? I want the customer to only 
source traffic from the /56 being assigned and I don't want ISP router to 
have any IPs in that space. Does IPv6 capable CPEs have the possibility to 
source packets from local network (received via pd) and only have FE80: IP 
for upstream routing which is never used as an SRC address for 
communication with the outside world (apart from upstream router)?

If not, is this something that we should ask the CPE vendors for? It would 
be extremely nice for CoPP etc for ISP routers to have no IP in customer 
space, and CPEs to have no IP in ISP link-network space. Would make for 
very effective infrastructure ACLs.

Mikael Abrahamsson    email: swmike at swm.pp.se

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