Re: CARP-related error on 5.4RC3

From: Michael W. Lucas (mwlucas_at_blackhelicopters.org)
Date: 04/22/05

  • Next message: Andrey V. Elsukov: "Re: Good CD Burning Software" 
    Date: Fri, 22 Apr 2005 02:22:04 -0400
To: "Michael W. Lucas" <mwlucas@blackhelicopters.org>

    (copying mlaier@ because FreeBSD carp seems to be his baby, and we're
    trying to squeeze 5.3 out)

    Sorry to follow up on my own post, but more CARP weirdness on 5.4RC3.

    I have two traffic shapers, both i386 with fresh 5.4RC3 installs, one
    master and one backup.

    When I reboot the master, the backup quickly takes over -- just as you
    would expect.

    When the master finishes booting, however, the backup doesn't release
    one of the CARP interfaces. Even if I wait several minutes, the
    backup looks like this:

    pfsync0: flags=41<UP,RUNNING> mtu 1348
            pfsync: syncif: fxp0 maxupd: 128
    carp0: flags=41<UP,RUNNING> mtu 1500
            inet xxx.yy.zzz.20 netmask 0xffffffc0
            carp: MASTER vhid 1 advbase 1 advskew 100
    carp1: flags=41<UP,RUNNING> mtu 1500
            inet xxx.yy.zzz.129 netmask 0xffffff80
            carp: BACKUP vhid 2 advbase 1 advskew 100

    Note that carp0 is a master, while carp1 is a slave.
    Meanwhile, over on the master we have:

    pfsync0: flags=41<UP,RUNNING> mtu 1348
            pfsync: syncif: fxp0 maxupd: 128
    carp0: flags=41<UP,RUNNING> mtu 1500
            inet 198.88.118.20 netmask 0xffffffc0
            carp: MASTER vhid 1 advbase 1 advskew 0
    carp1: flags=41<UP,RUNNING> mtu 1500
            inet 198.88.118.129 netmask 0xffffff80
            carp: MASTER vhid 2 advbase 1 advskew 0

    So, two carp0 masters. This is not good.

    Both machines have the same sysctl settings:

    net.inet.carp.allow: 1
    net.inet.carp.preempt: 1
    net.inet.carp.log: 1
    net.inet.carp.arpbalance: 0

    ==ml

    On Fri, Apr 22, 2005 at 01:37:31AM -0400, Michael W. Lucas wrote:
    >
    > On a new backup traffic shaper I have the following routing table:
    >
    > Internet:
    > Destination Gateway Flags Refs Use Netif Expire
    > default xxx.yy.zzz.1 UGS 0 13708 carp0
    > 127.0.0.1 127.0.0.1 UH 0 0 lo0
    > ...
    >
    > Note the "netif" for my default route. When carp0 is in a backup
    > state, I cannot reach my default route from this machine! As you
    > might guess, this makes life difficult.
    >
    > On the master machine, though, the default route points at a real
    > interface and I can reach the Internet:
    >
    > Internet:
    > Destination Gateway Flags Refs Use Netif Expire
    > default xxx.yy.zzz.1 UGS 0 4563 em0
    > 127.0.0.1 127.0.0.1 UH 0 0 lo0
    > ...
    >
    > The machines have very different hardware: the master is a new Dell
    > 1650 with em cards, the backup is a desktop machine with xl cards.
    > The software is identical, however.
    >
    > In the interface list for the master machine, the em cards appear
    > above the carp interfaces. On the backup machine, the carp interfaces
    > appear before the xl interfaces. Might the default route simply be
    > attaching to the first appropriate interface it finds?
    >
    >
    > Since I have to get this machine in production tonight, I'm going to
    > try to hack around this, maybe with a shell script that creates and
    > ifconfigs the carp interfaces after the real interfaces are
    > configured. It's definitely odd, though, and figured it should be
    > reported.
    >
    >
    >
    >
    >
    >
    > --
    > Michael W. Lucas mwlucas@FreeBSD.org, mwlucas@BlackHelicopters.org
    > http://www.BlackHelicopters.org/~mwlucas/
    > Latest book: Cisco Routers for the Desperate
    > http://www.CiscoRoutersForTheDesperate.com 

    -- 
Michael W. Lucas	mwlucas@FreeBSD.org, mwlucas@BlackHelicopters.org
		http://www.BlackHelicopters.org/~mwlucas/
	       Latest book: Cisco Routers for the Desperate
	        http://www.CiscoRoutersForTheDesperate.com
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