Hi All, I'd like to ask simple question. :-) Can IPv6 address restore to Preferred State from Deprecated state? I think it's possible to do. However, there is no clear description in RFC4861/4862. Is it written in other RFCs?
I know that one of the weird behavior. Please see the following links. issue with SLAAC and deprecated IPv6 addresses on recent windows versions http://lists.cluenet.de/pipermail/ipv6-ops/2009-December/002718.html Windows 7 does not restore autoconfigured IPv6 addresses to Preferred from Deprecated state (bug?) [originally from windows7 forum] http://social.technet.microsoft.com/Forums/en-US/ipv6/thread/2e97220e-af61-48da-b2d4-f1d4ba321b1a/ In addtion, a address can become valid address such as a preferred address even if its valid lifetime expires during above situation. If CPE implemented a requirement that is described L-13 in draft-ietf-v6ops-ipv6-cpe-router-09, it could happen. If the prefix is changed to such as "prefix A --> prefix B --> prefix A", CPE can't recognize as a same prefix. Therefore, IPv6 address should restore to Preferred State from Deprecated state. > L-13: If the delegated prefix changes, i.e. the current prefix is > replaced with a new prefix without any overlapping time > period, then the IPv6 CE router MUST immediately advertise the > old prefix with a preferred lifetime of 0 and a valid lifetime > of 2 hours (which must be decremented in real time) in a > Router Advertisement message. Sincerely, Masanobu ยข(._.) ======================================== NEC AccessTechnica, Ltd. Access Networks Engineering Department Masanobu Kawashima ======================================== -------------------------------------------------------------------- IETF IPv6 working group mailing list ipv6@ietf.org Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6 --------------------------------------------------------------------
