Date: Mon, 03 Mar 2008 21:44:13 -0800 From: "Kevin Oberman" <oberman@es.net> To: net@freebsd.org Subject: IPv6 addresses not released when routes change Message-ID: <20080304054413.0BB5F45045@ptavv.es.net>
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--==_Exmh_1204609453_79349P Content-Type: text/plain; charset=us-ascii Content-Disposition: inline At a recent networking conference an IPv6 hour took place where IPv6 only was available. It was an interesting experience. On the whole, things worked well, but I hit one problem. When I brought up my system, I associated with the main conference SSID and received an IPv6 address prior to the IPv6 hour. Everything was working fine. At the appointed time, all of the SSIDs for IPv4/IPv6 were disabled. (No, I was not expecting that) and I re-associated with the IPv6 only SSID, the interface retained the old address in a different /64. It added the new address in a different /64, but did not remove the old address, even though there was no router to it. Worse, it continued to originate connections with the old address as the source. I had to manually delete the old address before I could open a connection. I've been thinking about what software should handle this. It needs to be some software that is aware that the router that assigned the the prefix is no longer available. There is nothing wrong with an IPv6 interfaces having several active addresses, so you can't delete one just because another is assigned. -- R. Kevin Oberman, Network Engineer Energy Sciences Network (ESnet) Ernest O. Lawrence Berkeley National Laboratory (Berkeley Lab) E-mail: oberman@es.net Phone: +1 510 486-8634 Key fingerprint:059B 2DDF 031C 9BA3 14A4 EADA 927D EBB3 987B 3751 --==_Exmh_1204609453_79349P Content-Type: application/pgp-signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.8 (FreeBSD) Comment: Exmh version 2.5 06/03/2002 iD8DBQFHzOGtkn3rs5h7N1ERAmZtAJ4/6KkyMwDYv7aZ8DdcX46oVzmEyQCgl8v8 EKv5p84uppGroMraCWQ+4L4= =afaV -----END PGP SIGNATURE----- --==_Exmh_1204609453_79349P--
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