From owner-freebsd-net@FreeBSD.ORG Tue Jul 5 05:32:36 2011 Return-Path: Delivered-To: freebsd-net@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 8FAE1106566B; Tue, 5 Jul 2011 05:32:36 +0000 (UTC) (envelope-from michael@rancid.berkeley.edu) Received: from malcolm.berkeley.edu (malcolm.Berkeley.EDU [IPv6:2607:f140:ffff:ffff::239]) by mx1.freebsd.org (Postfix) with ESMTP id 774E48FC0A; Tue, 5 Jul 2011 05:32:36 +0000 (UTC) Received: from towanda.burnttofu.net ([IPv6:2001:470:1f05:17a6:219:d1ff:fe26:5246]) (authenticated bits=0) by malcolm.berkeley.edu (8.14.4/8.13.8m1) with ESMTP id p655WZ0w045141 (version=TLSv1/SSLv3 cipher=AES256-SHA bits=256 verify=NO); Mon, 4 Jul 2011 22:32:36 -0700 (PDT) (envelope-from michael@rancid.berkeley.edu) X-Virus-Status: Clean X-Virus-Scanned: clamav-milter 0.96.2 at malcolm.berkeley.edu Message-ID: <4E12A1F3.1040302@rancid.berkeley.edu> Date: Mon, 04 Jul 2011 22:32:35 -0700 From: Michael Sinatra User-Agent: Mozilla/5.0 (X11; U; FreeBSD amd64; en-US; rv:1.9.2.18) Gecko/20110622 Thunderbird/3.1.11 MIME-Version: 1.0 To: Doug Barton References: <4E127E18.6090509@FreeBSD.org> <4E128477.6030108@rancid.berkeley.edu> <4E12911D.2060604@FreeBSD.org> <4E129312.4000709@FreeBSD.org> In-Reply-To: <4E129312.4000709@FreeBSD.org> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Cc: freebsd-net@freebsd.org Subject: Re: carp for IPv6? X-BeenThere: freebsd-net@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Networking and TCP/IP with FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 05 Jul 2011 05:32:36 -0000 On 07/04/11 21:29, Doug Barton wrote: > On 07/04/2011 21:20, Doug Barton wrote: >> On 07/04/2011 20:26, Michael Sinatra wrote: >>> On 07/04/11 19:59, Doug Barton wrote: >>>> If I try to set up a carp interface for IPv6 on a recent 8.2-STABLE I >>>> get an error using either /64 or /128 as the mask: >>>> >>>> ifconfig carp2 vhid 4 advskew 0 pass mycleverpass 2001:a:b:c::2/64 >>>> >>>> ifconfig 2001:a:b:c::2/64: bad value (width too large) >>>> >>>> There are no examples for IPv6 in the man page, or the handbook; and I >>>> can't find any on line. I'm interested in configuration for the command >>>> line, and rc.conf. >>> >>> ifconfig_carp0="vhid 80 advskew 120 pass yomama 128.32.206.100/32" >>> ipv6_ifconfig_carp0="2607:f140:ffff:ffff::80/128" >>> >>> Works on 8.2-STABLE (June 7, 2011). >>> >>> Note that I cannot get carp to work properly without configuring an IPv4 >>> address. > > I should point out that I was able to do the following: > > ifconfig carp2 *inet6* vhid 4 .... > > as above, and it "worked" in the sense that it configured the carp > interface, but subsequently my IPv6 network went straight into the > crapper. Hence, the statement that it won't work without an IPv4 address > seems to be correct. This seems pretty sub-optimal given the world we > currently live in ... Sorry, I was watching fireworks or I would have tipped you off on that one earlier. I was setting that config up as part of a talk I gave on building a redundant IPv6 web reverse-proxy for World IPv6 Day, which has some of the config snippets I just gave you. This was at the Internet2/ESCC Joint Techs meeting: http://www.internet2.edu/presentations/jt2011winter/20110202-sinatra-world-IPv6-day-LT.pdf The video for the talk can be seen here: http://events.internet2.edu/2011/jt-clemson/agenda.cfm?go=session&id=10001572&event=1150 Anyway, I had some trouble getting carp to work correctly between 8.x hosts and 7.x hosts (both sides claimed to be master), in addition to the IPv6 issue. I had meant to do some more troubleshooting after I returned from the talk, but I was in the process of changing jobs and a couple of the test servers at UCB are currently down and I need to get them back up. In other words, I haven't had the chance to troubleshoot these issues further, but I do know that you definitely need to configure IPv4 on the interface. michael