[Bug 264883] ena and epair interfaces cannot be members of the same bridge

From: <bugzilla-noreply_at_freebsd.org>
Date: Sat, 25 Jun 2022 07:44:13 UTC

Kristof Provost <kp@freebsd.org> changed:

           What    |Removed                     |Added
                 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) !=
1500' or something like it.

You should be able to fix that by changing the ena or epair MTU prior to adding
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

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