weird netstat -i IF output in bridge configuration.

Stefan Lambrev stefan.lambrev at moneybookers.com
Mon Jan 28 06:47:07 PST 2008


Greetings,

While testing the bridge I noticed something interesting
netstat -w 1 -i em2 reports packets that are not passed through em2

em0: flags=8943<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST> metric 0 
mtu 1500
        options=198<VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM,TSO4>
        ether 00:15:17:58:10:99
        media: Ethernet autoselect (1000baseTX <full-duplex>)
        status: active
em1: flags=8943<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST> metric 0 
mtu 1500
        options=198<VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM,TSO4>
        ether 00:15:17:58:10:98
        media: Ethernet autoselect (1000baseTX <full-duplex>)
        status: active
em2: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
        options=19b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM,TSO4>
        ether 00:15:17:58:10:9b
        media: Ethernet autoselect (1000baseTX <full-duplex>)
        status: active

-em3, and em4 skipped-

bridge0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 
1500
        ether ea:b9:a3:31:7f:fb
        inet 10.3.3.3 netmask 0xffffff00 broadcast 10.3.3.255
        id 00:15:17:49:d5:3c priority 32768 hellotime 2 fwddelay 15
        maxage 20 holdcnt 6 proto rstp maxaddr 100 timeout 1200
        root id 00:15:17:49:d5:3c priority 32768 ifcost 0 port 0
        member: em1 
flags=1e7<LEARNING,DISCOVER,STP,EDGE,AUTOEDGE,PTP,AUTOPTP>
                port 2 priority 128 path cost 20000 proto rstp
                role designated state forwarding
        member: em0 
flags=1e7<LEARNING,DISCOVER,STP,EDGE,AUTOEDGE,PTP,AUTOPTP>
                port 1 priority 128 path cost 20000 proto rstp
                role designated state forwarding

netstat -w 1 -i interface reports incomming and outgoing traffic on all 
interfaces even the one that are without carrier.

It seems like netstat always reports statistics from bridge0 device.

Is this expected behavior or I just hit a bug? :)

FreeBSD 7.0-RC1 #18: Sun Jan 27 18:55:16 EET 2008 amd64

-- 

Best Wishes,
Stefan Lambrev
ICQ# 24134177



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