root@warp:~# ifconfig -a
lo0: flags=849<UP,LOOPBACK,RUNNING,MULTICAST> mtu 8232
        inet 127.0.0.1 netmask ff000000 
hme0: flags=863<UP,BROADCAST,NOTRAILERS,RUNNING,MULTICAST> mtu 1500
        inet 170.200.10.9 netmask ffff0000 broadcast 170.200.255.255
        ether 8:0:20:b0:64:55 
root@warp:~# ifconfig hme0
hme0: flags=863<UP,BROADCAST,NOTRAILERS,RUNNING,MULTICAST> mtu 1500
        inet 170.200.10.9 netmask ffff0000 broadcast 170.200.255.255
        ether 8:0:20:b0:64:55 
root@warp:~# ifconfig hme0:1 plumb
root@warp:~# ifconfig -a
lo0: flags=849<UP,LOOPBACK,RUNNING,MULTICAST> mtu 8232
        inet 127.0.0.1 netmask ff000000 
hme0: flags=863<UP,BROADCAST,NOTRAILERS,RUNNING,MULTICAST> mtu 1500
        inet 170.200.10.9 netmask ffff0000 broadcast 170.200.255.255
        ether 8:0:20:b0:64:55 
root@warp:~# ifconfig hme0:1 up
root@warp:~# ifconfig -a
lo0: flags=849<UP,LOOPBACK,RUNNING,MULTICAST> mtu 8232
        inet 127.0.0.1 netmask ff000000 
hme0: flags=863<UP,BROADCAST,NOTRAILERS,RUNNING,MULTICAST> mtu 1500
        inet 170.200.10.9 netmask ffff0000 broadcast 170.200.255.255
        ether 8:0:20:b0:64:55 
hme0:1: flags=843<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
        inet 0.0.0.0 netmask 0 

root@warp:~# ifconfig hme0:1 170.200.10.10
root@warp:~# ifconfig -a
lo0: flags=849<UP,LOOPBACK,RUNNING,MULTICAST> mtu 8232
        inet 127.0.0.1 netmask ff000000 
hme0: flags=863<UP,BROADCAST,NOTRAILERS,RUNNING,MULTICAST> mtu 1500
        inet 170.200.10.9 netmask ffff0000 broadcast 170.200.255.255
        ether 8:0:20:b0:64:55 
hme0:1: flags=843<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
        inet 170.200.10.10 netmask ffff0000 broadcast 170.200.255.255


root@warp:~# ifconfig -a
lo0: flags=849<UP,LOOPBACK,RUNNING,MULTICAST> mtu 8232
        inet 127.0.0.1 netmask ff000000 
hme0: flags=863<UP,BROADCAST,NOTRAILERS,RUNNING,MULTICAST> mtu 1500
        inet 170.200.10.9 netmask ffff0000 broadcast 170.200.255.255
        ether 8:0:20:b0:64:55 
hme0:1: flags=843<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
        inet 170.200.10.10 netmask ffff0000 broadcast 170.200.255.255
root@warp:~# ifconfig hme0:1 unplumb (this is not a good idea to do)