[Bug 262316] em(4) does not autonegotiate when fixed media is set

From: <bugzilla-noreply_at_freebsd.org>
Date: Thu, 03 Mar 2022 16:28:13 UTC

Stefan Eßer <se@FreeBSD.org> changed:

           What    |Removed                     |Added
         Resolution|---                         |Not A Bug
             Status|New                         |Closed
                 CC|                            |se@FreeBSD.org

--- Comment #1 from Stefan Eßer <se@FreeBSD.org> ---
The behavior is correct according to the standard!

See: https://en.wikipedia.org/wiki/Duplex_mismatch

If a device is set to a fixed speed and media setting, a connecting device
configured to perform auto-negotion may detect the speed, but must assume
half-duplex mode.

This may not be the expected behavior today, but is what the standard demands.

Either use auto-negotiation on both interfaces or set both to matching modes.

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