[Bug 262316] em(4) does not autonegotiate when fixed media is set
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Date: Thu, 03 Mar 2022 16:28:13 UTC
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=262316
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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