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Date:      Sat, 25 Jun 2022 07:44:13 +0000
From:      bugzilla-noreply@freebsd.org
To:        bugs@FreeBSD.org
Subject:   [Bug 264883] ena and epair interfaces cannot be members of the same bridge
Message-ID:  <bug-264883-227-0fLmTQPOoX@https.bugs.freebsd.org/bugzilla/>
In-Reply-To: <bug-264883-227@https.bugs.freebsd.org/bugzilla/>
References:  <bug-264883-227@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D264883

Kristof Provost <kp@freebsd.org> changed:

           What    |Removed                     |Added
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                 CC|                            |kp@freebsd.org

--- Comment #1 from Kristof Provost <kp@freebsd.org> ---
I suspect the problem here is one of MTU.

if_bridge sets its MTU to that of the first interface added to it. That's
either 9001 (ena) or 1500 (epair). When you try to add the second interface=
 it
the MTU does not match and the interface is not added.

There should be a log in `dmesg` saying 'bridge0: invalid MTU: 9001(ena0) !=
=3D
1500' or something like it.

You should be able to fix that by changing the ena or epair MTU prior to ad=
ding
it to the bridge.

You should also know that the behaviour of if_bridge has been changed in 14,
where it will change the MTU of newly added members, rather than rejecting
them.

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