To me a flash renumbering = power failure and recovery or a power cycle. which is always quite annoying with different upses lasting different times.
Or are we relying on some device, somewhere, reliably keeping all state on flash? On Fri, Jul 31, 2015 at 8:12 AM, Steven Barth <cy...@openwrt.org> wrote: >>> Much will depend if the ISP is offering their customer a ‘graceful’ >>> renumbering event. If they do, then the principle applied in RFC4192 >>> could be applied, and you will have a period where both prefixes (old >>> and new) co-exist, before the old prefix is removed. In that case, the >>> older connections can be retained, at least until that removal. >> >> I don't think that HNCP announces the "deprecated" status of a delegated >> prefix, so there's no way for an HNCP node to propagate it from the >> delegated to the assigned prefix. Markus, Steven, Pierre? > > For all intents and purposes a "deprecated" prefix is one with a preferred > lifetime of 0 so that is supported (TLV has valid and preferred lifetimes). > If your ISP does a graceful renumbering than that is what happens, your > RA server just has to play ball here though. > > In an ungraceful case (flash renumbering) we stop announcing the prefix in > HNCP and the individual routers who have assigned it, MUST deprecate it > according to RFC 7084 (not just stop announcing it in RAs). This deprecation > sets preferred lifetime to 0 and valid lifetime to max (old valid lft, 2h). > > >> FORCERENEW with >> Nonce authentication might also be helpful, I'm not sure. > > Nobody (I know) implements that, though. Even for DHCPv6 it is rare (haven't > seen a host OS that does) and there its part of the main standard. > > _______________________________________________ > homenet mailing list > homenet@ietf.org > https://www.ietf.org/mailman/listinfo/homenet -- Dave Täht worldwide bufferbloat report: http://www.dslreports.com/speedtest/results/bufferbloat And: What will it take to vastly improve wifi for everyone? https://plus.google.com/u/0/explore/makewififast _______________________________________________ homenet mailing list homenet@ietf.org https://www.ietf.org/mailman/listinfo/homenet
