# ifconfig lnc0 192.168.1.5 netmask 255.255.255.255 alias
B) You can setup this alias in /etc/rc.conf file by appending following text, so that next time FreeBSD comes up (after restart/shutdown) it will create alias for you:
ifconfig_lnc0_alias0=”192.168.1.5 netmask 255.255.255.255″
C)Restart FreeBSD network service using following script:
# /etc/netstart
D) Display alias and real ip using ifconfig lnc0 command:
# ifconfig lnc0
lnc0: flags=8843
inet6 fe80::20c:29ff:fe01:ddbd%lnc0 prefixlen 64 scopeid 0×1
inet 192.168.1.2 netmask 0xffffff00 broadcast 192.168.1.255
inet 192.168.1.5 netmask 0xffff
Read ifconfig man page.