[Bug 230996] em/igb: Intel i210/i350: ifconfig: enabling "vlanhwtag" renders VLAN on i210/i350 NICs unusable

From: <bugzilla-noreply_at_freebsd.org>
Date: Sun, 30 May 2021 03:49:18 UTC

--- Comment #32 from Jason Tubnor <jason@tubnor.net> ---

Through further investigation on how interfaces behave in a VLAN/non-VLAN stage
where bridges are concerned, I have found the following interface adjustment in
rc.conf remediated the issue (however, the driver should automagically do this
for the user):

ifconfig_igb0="-txcsum -txcsum6 -lro -tso up"

Adjust for your specific interface.

Can you try that and report back?

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