In message <[email protected]>, Mark Andrews writes: > > In message <ca5dea74.158185%[email protected]>, "Brzozowski, > Jo > hn" writes: > > This is something that should be today as part of broadband IPv6 > > deployments to prevent conflict at the service provider edge. I cannot > > think of a good reason why I would want to accept IPv6 router > > advertisements, at this time from residential gateways. > > If they advertise the /64's of the /56 they are using you can filter > the unrequested traffic and also prevent looping packets when they > send the rest of the /56 back to you. If we don't do something > like this the border CPE router has to have a null route covering > the /56 (or whatever upstream has delegated to it) which would be > a good thing to do regardless. > > Seeing the /64's also gives you a insight into whether you can > allocate on the /60 boundary or not. Similarly if you need to > start planning for /52's rather than /56's. > > Mark
Additionally, the advertised prefixes could be used to make BCP 38 filters better for homes that are multi-homed (or even single homed). You don't need to propogate the routes but you could accept traffic sourced from the advertised ranges. Yes, I'm aware there are lots of issues involved here like not accepting overly broad routes and rapidly changing routes to prevent/reduce the abuse potential. Mark > > John > > > > On 8/2/11 1:47 AM, "Michael Newbery" <[email protected]> wrote: > > > > >It's outside the CPE spec, but I can see that the document could state, > > >as an assumption, that the ISP will filter routing advertisements from > > >the CPE and will only pass those that it has determined (via some > > >external mechanism, undefined in this document) belong to the CPE. > > > > _______________________________________________ > > homenet mailing list > > [email protected] > > https://www.ietf.org/mailman/listinfo/homenet > -- > Mark Andrews, ISC > 1 Seymour St., Dundas Valley, NSW 2117, Australia > PHONE: +61 2 9871 4742 INTERNET: [email protected] > _______________________________________________ > homenet mailing list > [email protected] > https://www.ietf.org/mailman/listinfo/homenet -- Mark Andrews, ISC 1 Seymour St., Dundas Valley, NSW 2117, Australia PHONE: +61 2 9871 4742 INTERNET: [email protected] _______________________________________________ homenet mailing list [email protected] https://www.ietf.org/mailman/listinfo/homenet
