Date: Mon, 04 Jul 2011 22:32:35 -0700 From: Michael Sinatra <michael@rancid.berkeley.edu> To: Doug Barton <dougb@freebsd.org> Cc: freebsd-net@freebsd.org Subject: Re: carp for IPv6? Message-ID: <4E12A1F3.1040302@rancid.berkeley.edu> In-Reply-To: <4E129312.4000709@FreeBSD.org> References: <4E127E18.6090509@FreeBSD.org> <4E128477.6030108@rancid.berkeley.edu> <4E12911D.2060604@FreeBSD.org> <4E129312.4000709@FreeBSD.org>
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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
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