hasso@hasso:~$ sudo ifconfig fxp1 192.168.11.1/32
hasso@hasso:~$ sudo ifconfig fxp1 192.168.11.2/32 alias
hasso@hasso:~$ sudo ifconfig fxp1 192.168.11.3/32 alias
hasso@hasso:~$ ifconfig fxp1
fxp1: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
        inet 192.168.11.1 netmask 0xffffffff broadcast 192.168.11.1
        inet6 fe80::20c:f1ff:fe6c:6372%fxp1 prefixlen 64 scopeid 0x2
        inet 192.168.11.2 netmask 0xffffffff broadcast 192.168.11.2
        inet 192.168.11.3 netmask 0xffffffff broadcast 192.168.11.3
        ether 00:0c:f1:6c:63:72
        media: Ethernet autoselect (100baseTX <full-duplex>)
        status: active
hasso@hasso:~$ sudo ifconfig fxp1 192.168.11.1/32
hasso@hasso:~$ ifconfig fxp1
fxp1: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
        inet6 fe80::20c:f1ff:fe6c:6372%fxp1 prefixlen 64 scopeid 0x2
        inet 192.168.11.2 netmask 0xffffffff broadcast 192.168.11.2
        inet 192.168.11.3 netmask 0xffffffff broadcast 192.168.11.3
        inet 192.168.11.1 netmask 0xffffffff broadcast 192.168.11.1
        ether 00:0c:f1:6c:63:72
        media: Ethernet autoselect (100baseTX <full-duplex>)
        status: active
hasso@hasso:~$ sudo ifconfig fxp1 192.168.11.1/32
hasso@hasso:~$ ifconfig fxp1
fxp1: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
        inet6 fe80::20c:f1ff:fe6c:6372%fxp1 prefixlen 64 scopeid 0x2
        inet 192.168.11.3 netmask 0xffffffff broadcast 192.168.11.3
        inet 192.168.11.1 netmask 0xffffffff broadcast 192.168.11.1
        ether 00:0c:f1:6c:63:72
        media: Ethernet autoselect (100baseTX <full-duplex>)
        status: active
hasso@hasso:~$