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Date:      Wed, 23 Jun 2010 02:30:03 +0400
From:      Michael Monashev <softsearch@gmail.com>
To:        FreeBSD Net <freebsd-net@freebsd.org>
Subject:   can't disable VLAN_MTU and VLAN_HWCSUM
Message-ID:  <1476665685.20100623023003@gmail.com>
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Hi

FreeBSD 8.0-RELEASE-p3

$ ifconfig
em0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 9216
        options=18b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWCSUM,TSO4>
        ether 00:15:17:35:1c:76
        media: Ethernet autoselect (1000baseT <full-duplex>)
        status: active
em1: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 9216
        options=18b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWCSUM,TSO4>
        ether 00:15:17:35:1c:76
        media: Ethernet autoselect (1000baseT <full-duplex>)
        status: active
lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> metric 0 mtu 16384
        options=3<RXCSUM,TXCSUM>
        inet6 fe80::1%lo0 prefixlen 64 scopeid 0x3
        inet6 ::1 prefixlen 128
        inet 127.0.0.1 netmask 0xff000000
lagg0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 9216
        options=18b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWCSUM,TSO4>
        ether 00:15:17:35:1c:76
        inet 89.208.146.215 netmask 0xffffff00 broadcast 89.208.146.255
        inet 192.168.2.5 netmask 0xffffff00 broadcast 192.168.2.255
        inet 89.208.145.139 netmask 0xffffff00 broadcast 89.208.145.255
        media: Ethernet autoselect
        status: active
        laggproto lacp
        laggport: em1 flags=1c<ACTIVE,COLLECTING,DISTRIBUTING>
        laggport: em0 flags=1c<ACTIVE,COLLECTING,DISTRIBUTING>
vlan2: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 9216
        ether 00:15:17:35:1c:76
        inet 10.0.143.5 netmask 0xffffff00 broadcast 10.0.143.255
        media: Ethernet autoselect
        status: active
        vlan: 2 parent interface: lagg0
lo1: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> metric 0 mtu 16384
        options=3<RXCSUM,TXCSUM>
        inet 127.0.1.1 netmask 0xffffff00
        inet 127.0.1.2 netmask 0xffffffff
        inet 127.0.1.3 netmask 0xffffffff
        inet 127.0.1.4 netmask 0xffffffff
        inet 127.0.1.5 netmask 0xffffffff
        inet 127.0.1.6 netmask 0xffffffff
        inet 127.0.1.7 netmask 0xffffffff
        inet 127.0.1.8 netmask 0xffffffff
        inet 127.0.1.9 netmask 0xffffffff
        inet 127.0.1.10 netmask 0xffffffff
        inet 127.0.1.11 netmask 0xffffffff
        inet 127.0.1.12 netmask 0xffffffff
        inet 127.0.1.13 netmask 0xffffffff
        inet 127.0.1.14 netmask 0xffffffff
        inet 127.0.1.15 netmask 0xffffffff
        inet 127.0.1.16 netmask 0xffffffff
        inet 127.0.1.17 netmask 0xffffffff
        inet 127.0.1.18 netmask 0xffffffff
        inet 127.0.1.19 netmask 0xffffffff
        inet 127.0.1.20 netmask 0xffffffff

$ sudo ifconfig em0 -vlanmtu
$ sudo ifconfig em1 -vlanmtu
$ sudo ifconfig em0 -vlanhwfilter
$ sudo ifconfig em1 -vlanhwfilter

$ ifconfig
em0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 9216
        options=18b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWCSUM,TSO4>
        ether 00:15:17:35:1c:76
        media: Ethernet autoselect (1000baseT <full-duplex>)
        status: active
em1: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 9216
        options=18b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWCSUM,TSO4>
        ether 00:15:17:35:1c:76
        media: Ethernet autoselect (1000baseT <full-duplex>)
        status: active
lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> metric 0 mtu 16384
        options=3<RXCSUM,TXCSUM>
        inet6 fe80::1%lo0 prefixlen 64 scopeid 0x3
        inet6 ::1 prefixlen 128
        inet 127.0.0.1 netmask 0xff000000
lagg0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 9216
        options=18b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWCSUM,TSO4>
        ether 00:15:17:35:1c:76
        inet 89.208.146.215 netmask 0xffffff00 broadcast 89.208.146.255
        inet 192.168.2.5 netmask 0xffffff00 broadcast 192.168.2.255
        inet 89.208.145.139 netmask 0xffffff00 broadcast 89.208.145.255
        media: Ethernet autoselect
        status: active
        laggproto lacp
        laggport: em1 flags=1c<ACTIVE,COLLECTING,DISTRIBUTING>
        laggport: em0 flags=1c<ACTIVE,COLLECTING,DISTRIBUTING>
vlan2: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 9216
        ether 00:15:17:35:1c:76
        inet 10.0.143.5 netmask 0xffffff00 broadcast 10.0.143.255
        media: Ethernet autoselect
        status: active
        vlan: 2 parent interface: lagg0
lo1: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> metric 0 mtu 16384
        options=3<RXCSUM,TXCSUM>
        inet 127.0.1.1 netmask 0xffffff00
        inet 127.0.1.2 netmask 0xffffffff
        inet 127.0.1.3 netmask 0xffffffff
        inet 127.0.1.4 netmask 0xffffffff
        inet 127.0.1.5 netmask 0xffffffff
        inet 127.0.1.6 netmask 0xffffffff
        inet 127.0.1.7 netmask 0xffffffff
        inet 127.0.1.8 netmask 0xffffffff
        inet 127.0.1.9 netmask 0xffffffff
        inet 127.0.1.10 netmask 0xffffffff
        inet 127.0.1.11 netmask 0xffffffff
        inet 127.0.1.12 netmask 0xffffffff
        inet 127.0.1.13 netmask 0xffffffff
        inet 127.0.1.14 netmask 0xffffffff
        inet 127.0.1.15 netmask 0xffffffff
        inet 127.0.1.16 netmask 0xffffffff
        inet 127.0.1.17 netmask 0xffffffff
        inet 127.0.1.18 netmask 0xffffffff
        inet 127.0.1.19 netmask 0xffffffff
        inet 127.0.1.20 netmask 0xffffffff
        
As you can see, ifconfig didn`t change anything.
How to disable VLAN_MTU and VLAN_HWCSUM flags?
        
-- 
Michael

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