freebsd-4/root# ifconfig em2
em2: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
        options=9b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM>
        ether 00:0c:29:eb:eb:a0
        inet6 fe80::20c:29ff:feeb:eba0%em2 prefixlen 64 scopeid 0x3
        nd6 options=3<PERFORMNUD,ACCEPT_RTADV>
        media: Ethernet autoselect (1000baseT <full-duplex>)
        status: active
freebsd-4/root# /usr/local/sbin/dhclient em2
em2: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
        options=9b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM>
        ether 00:0c:29:eb:eb:a0
        inet6 fe80::20c:29ff:feeb:eba0%em2 prefixlen 64 scopeid 0x3
        inet 0.0.0.0 netmask 0xff000000 broadcast 255.255.255.255
        nd6 options=3<PERFORMNUD,ACCEPT_RTADV>
        media: Ethernet autoselect (1000baseT <full-duplex>)
        status: active
em2: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
        options=9b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM>
        ether 00:0c:29:eb:eb:a0
        inet6 fe80::20c:29ff:feeb:eba0%em2 prefixlen 64 scopeid 0x3
        nd6 options=3<PERFORMNUD,ACCEPT_RTADV>
        media: Ethernet autoselect (1000baseT <full-duplex>)
        status: active
dhclient: New Network Number: 192.168.0.0
dhclient: New Broadcast Address: 192.168.0.255
dhclient: New IP Address (em2): 192.168.0.101
dhclient: New Subnet Mask (em2): 255.255.255.0
dhclient: New Broadcast Address (em2): 192.168.0.255
dhclient: New Routers: 192.168.0.1
freebsd-4/root#
freebsd-4/root# /usr/local/sbin/dhclient -6 em2
freebsd-4/root#
freebsd-4/root# ifconfig em2
em2: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
        options=9b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM>
        ether 00:0c:29:eb:eb:a0
        inet6 fe80::20c:29ff:feeb:eba0%em2 prefixlen 64 scopeid 0x3
        inet 192.168.0.101 netmask 0xffffff00 broadcast 192.168.0.255
        inet6 2001::4 prefixlen 64
        nd6 options=3<PERFORMNUD,ACCEPT_RTADV>
        media: Ethernet autoselect (1000baseT <full-duplex>)
        status: active
freebsd-4/root#
