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Date:      Tue, 07 Dec 2021 10:07:50 +0000
From:      bugzilla-noreply@freebsd.org
To:        bugs@FreeBSD.org
Subject:   [Bug 260260] igb(4) I35{0,4} parrent <--> vlan jumbo frame mtu mismatch
Message-ID:  <bug-260260-227-Kcw17skn7D@https.bugs.freebsd.org/bugzilla/>
In-Reply-To: <bug-260260-227@https.bugs.freebsd.org/bugzilla/>
References:  <bug-260260-227@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D260260

--- Comment #2 from Zhenlei Huang <zlei.huang@gmail.com> ---
So it is weird.

If VLANMTU is disabled on parent interface, MTU of VLAN interface will be
limited off by 4 automatically. The MTU of vlans should be 8996 in your cas=
e.

Try the following steps:

1. Disabling all vlan hardware offloading features in rc.conf:

ifconfig_igb0=3D"mtu 9000 -vlanmtu -vlanhwtag -vlanhwfilter -vlanhwtso
-vlanhwcsum up"
ifconfig_igb1=3D"mtu 9000 -vlanmtu -vlanhwtag -vlanhwfilter -vlanhwtso
-vlanhwcsum up"

2. reboot

For the 2nd step, you could also destroy cloned interfaces and restart netif
service.

# ifconfig vlan0 destroy
# ifconfig vlan1 destroy
# ifconfig ... destroy
# ifconfig lagg0 destroy
# service netif restart

--=20
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