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Date:      Thu, 21 Sep 2017 08:01:09 +0200
From:      Gerhard Schmidt <schmidt@ze.tum.de>
To:        Freebsd Questions <freebsd-questions@freebsd.org>
Subject:   FreeBSD Bridging doesn't work on FreeBSD 11
Message-ID:  <e3a3f99a-a936-9a90-0a4f-4a8c1d9ad49b@ze.tum.de>
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Hi,

I'm doing some packetfiltering between two network segments. I've a
running bridge on FreeBSD 8.2

cloned_interfaces="bridge0"
autobridge_interfaces="bridge0"
autobridge_bridge0="fxp0 fxp1"
ifconfig_bridge0="inet 10.100.32.15/24 up"
ifconfig_fxp0="up"
ifconfig_fxp1="up"

this one running for years without a hitch. But it's quite old so I'm
building a replacement on FreeBSD 11.1

I've copied these setting and the firewall configs as well.

cloned_interfaces="bridge0"
autobridge_interfaces="bridge0"
autobridge_bridge0="em0 em1"
ifconfig_bridge0="inet 10.100.32.18/24 up"
ifconfig_em0="up"
ifconfig_em1="up"

The new bridge starting up does bridge the traffic but the bridge server
can't communicate.

here is the output from ifconfig


em0: flags=8943<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST> metric 0
mtu 1500
        options=9b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM>
        ether 08:00:27:53:57:a0
        hwaddr 08:00:27:53:57:a0
        nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
        media: Ethernet autoselect (1000baseT <full-duplex>)
        status: active
em1: flags=8943<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST> metric 0
mtu 1500
        options=9b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM>
        ether 08:00:27:12:e7:9e
        hwaddr 08:00:27:12:e7:9e
        nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
        media: Ethernet autoselect (1000baseT <full-duplex>)
        status: active
lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> metric 0 mtu 16384
        options=600003<RXCSUM,TXCSUM,RXCSUM_IPV6,TXCSUM_IPV6>
        inet6 ::1 prefixlen 128
        inet6 fe80::1%lo0 prefixlen 64 scopeid 0x3
        inet 127.0.0.1 netmask 0xff000000
        nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL>
        groups: lo
bridge0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu
1500
        ether 02:3d:73:0f:54:00
        inet 10.100.32.18 netmask 0xffffff00 broadcast 10.100.32.255
        nd6 options=9<PERFORMNUD,IFDISABLED>
        groups: bridge
        id 00:00:00:00:00:00 priority 32768 hellotime 2 fwddelay 15
        maxage 20 holdcnt 6 proto rstp maxaddr 2000 timeout 1200
        root id 00:00:00:00:00:00 priority 32768 ifcost 0 port 0
        member: em1 flags=143<LEARNING,DISCOVER,AUTOEDGE,AUTOPTP>
                ifmaxaddr 0 port 2 priority 128 path cost 2000000
        member: em0 flags=143<LEARNING,DISCOVER,AUTOEDGE,AUTOPTP>
                ifmaxaddr 0 port 1 priority 128 path cost 2000000

if delete the bridge and configure em0 directly ip works.

anyone a idea what I'm doing wrong.

Regards
    Estartu

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