Adding IP aliases in FreeBSD - Freebsd ifconfig add Remove Alias IPv4 / IPv6 / inet6

FreeBSD Assign IPv4 address

: # ifconfig em0 inet 192.168.10.5 netmask 255.255.255.0

FreeBSD ifconfig add alias for IPv4

: # ifconfig em0 inet 192.168.10.10/24 add

FreeBSD ifconfig remove alias for IPv4

: # ifconfig em0 inet 192.168.10.10/24 -alias

For IPv6
FreeBSD Enable IPv6 functionality of the interface:

: # ifconfig em0 inet6 -ifdisabled

FreeBSD Add the IPv6 address 2001:DB8:DBDB::123/48 to the interface em0:

: # ifconfig em0 inet6 2001:db8:bdbd::123 prefixlen 48 alias

FreeBSD ifconfig remove/delete Alias for IPv6 inet6

: # ifconfig em0 inet6 2001:db8:bdbd::123/48 delete