# sysctl -a | grep bridge
net.link.ether.bridge.version: 031224
net.link.ether.bridge.debug: 0
net.link.ether.bridge.ipf: 0
net.link.ether.bridge.ipfw: 1
net.link.ether.bridge.copy: 0
net.link.ether.bridge.ipfw_drop: 0
net.link.ether.bridge.ipfw_collisions: 0
net.link.ether.bridge.packets: 26004
net.link.ether.bridge.dropped: 0
net.link.ether.bridge.predict: 20586
net.link.ether.bridge.enable: 1
net.link.ether.bridge.config: fxp0:1 fxp1:1
net.link.ether.bridge_ipf: 0
net.link.ether.bridge_ipfw: 1
net.link.ether.bridge_cfg: fxp0:1 fxp1:1
dev.pcib.0.%desc: ACPI Host-PCI bridge
dev.hostb.0.%desc: Host to PCI bridge
dev.isab.0.%desc: PCI-ISA bridge