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List:       freebsd-current
Subject:    Re: CARP will not relinquish master state on one interface
From:       Freddie Cash <fjwcash () gmail ! com>
Date:       2013-03-27 21:23:58
Message-ID: CAOjFWZ6iV2iPyMMbY3iRPvbCcwQWT-Svd1z++cP1nFzd3pTyWA () mail ! gmail ! com
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Figure it out.  :(

Was an IPFW rule.  Seems the following two rules block CARP traffic:

# Check for spoofed packets
# Anti-spoof rules
# These do roughly the same things:
#   verrevpath checks all incoming packets to see if the source IP matches
any route on that interface
#   antispoof  checks all incoming packets to make sure the source IP is
not listed in a network of another interface
$ipfw add 30 deny log ip from any to any not verrevpath in recv $if_public
$ipfw add 40 deny log ip from any to any not antispoof  in recv $if_public

Removing those two rules on both boxes makes em0 fail-over correctly
between the two.



On Wed, Mar 27, 2013 at 2:02 PM, Freddie Cash <fjwcash@gmail.com> wrote:

> Two systems running identical hardware and software (one system actually
> rsync'd from the other).  Running 10-CURRENT just after the new CARP
> implementation went in:
>
> FreeBSD nexus2.sd73.bc.ca 10.0-CURRENT FreeBSD 10.0-CURRENT #1 r245195:
> Thu Jan 10 10:29:16 PST 2013     root@nexus2.sd73.bc.ca:/usr/obj/usr/src/sys/NEXUS
> i386
>
> Each box has 2 interfaces configured:
>   em0 is part of an untagged vlan
>   em1 is part of 8 tagged vlans
>
> The tagged vlan interfaces work correctly on both boxes, and CARP switches
> back and forth between MASTER and BACKUP correctly, whether it be via
> unplugging the network cable or via "ifconfig ... state" changes.
>
> The untagged vlan on both boxes will not relinquish MASTER status.  If
> both boxes are up, both em0 interfaces are up, then both boxes configure
> the vhid as MASTER and nasty things happen to our traffic.
>
> The network configuration is:
>
> [remote site]------fibre link--------[fibre switch]----------[carp
> box1]--------[internet]
> [remote site]------fibre link----------/            \------------[carp box
> 2]-------/
> [remote site]------fibre link---------/
>
> The fibre links to the fibre switch are on untagged vlans; the link from
> the switch to each carp box is a tagged vlan trunk.  And the link from each
> carp box to the Internet router is an untagged vlan.
>
> If only box1 is online, everything works correctly.
>
> If only box2 is online, everything works correctly.
>
> If both boxes are online, everything on em1 works correctly, and em0 shows
> MASTER on both boxes.
>
> If both boxes are online but em0 is down on 1 (either) box, everything
> works correctly.
>
> Running "tcpdump -n -i em0 -T carp | grep CARP" on both boxes shows the
> CARPv2 traffic from both boxes, with the correct vhid, advbase, advskew for
> each box.  But the logs on box2 show "master down".
>
> I'm at a loss as to what to try next.  Everything works for all the vlan
> interfaces on em1.  But nothing I've tried works for em0.  Within 2 seconds
> of the link showing UP, it becomes MASTER.  On both boxes.
>
> --
> Freddie Cash
> fjwcash@gmail.com
>



-- 
Freddie Cash
fjwcash@gmail.com
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