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Date:      Mon, 06 May 2019 13:56:37 +0000
From:      bugzilla-noreply@freebsd.org
To:        net@FreeBSD.org
Subject:   [Bug 234472] Missing outgoing CARP traffic on interface
Message-ID:  <bug-234472-7501-uNStKPOkqH@https.bugs.freebsd.org/bugzilla/>
In-Reply-To: <bug-234472-7501@https.bugs.freebsd.org/bugzilla/>
References:  <bug-234472-7501@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D234472

Andreas Pflug <pgadmin@pse-consulting.de> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Severity|Affects Only Me             |Affects Some People

--- Comment #4 from Andreas Pflug <pgadmin@pse-consulting.de> ---
After debugging a while, I found out that outgoing CARP packets are sent to=
 the
expected MAC address 01:00:5e:00:00:12 with pf disabled, on some interfaces
(those with gateways) instead of coding the lower 23bits of 224.0.0.18 into=
 the
address some gateway on that local network is used. This is not conforming =
to
RFC1112 6.4, and apparently some IGMP aware switches will filter those
malformed packets.

In some case, flipping some IGMP instructions on switches affected may fix =
CARP
functionality, but the basic problem is in the freebsd kernel.

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