FreeBSD Handbuch: LAN-Kopplung mit einer Bridge

# ifconfig bridge create
bridge0

# ifconfig bridge0
bridge0: flags=8802<BROADCAST,SIMPLEX,MULTICAST> metric 0 mtu 1500
        ether 96:3d:4b:f1:79:7a
        id 00:00:00:00:00:00 priority 32768 hellotime 2 fwddelay 15
        maxage 20 holdcnt 6 proto rstp maxaddr 100 timeout 1200
        root id 00:00:00:00:00:00 priority 0 ifcost 0 port 0

# ifconfig bridge0 addm fxp0 addm fxp1 up
# ifconfig fxp0 up
# ifconfig fxp1 up

# ifconfig bridge0 deletem fxp0
# ifconfig bridge0 destroy

Remove IPv4 10.16.4.200 from Interface re2
# ifconfig re2 inet 10.16.4.200 -alias

cloned_interfaces="bridge0"
ifconfig_bridge0="addm fxp0 addm fxp1 up"
ifconfig_fxp0="up"
ifconfig_fxp1="up"

Port Mirroring / Span Ports

FreeBSD Network Tap
What is port mirroring?
OpenBSD Network Tap

           ------------------
       re1 |     FreeBSD    | re2
     ------|  (Network Tap) |------
           ------------------
                   | vr0
                   |
                --------  
                |      |
                |  PC  |
                |      |
                --------
           (Traffic Collector)

# ifconfig bridge0 create
# ifconfig bridge0 addm rl0 addm rl1 up
# ifconfig bridge0 span vr0