To add virtual interface
1. Add entry in /etc/hosts
# ifconfig eri0 addif 10.100.10.20/24 broadcast 10.100.10.255 up
3. Create /etc/hostname.eri0:xx with domain name as its content (where xx is next available no for virtual NIC, verify that using ifconfig -a command)
or
1. Add statement to /etc/hostname.ce5 file
2. # ifconfig hme0 addif ip_address netmask + broadcast + up
To remove virtual interface
1. # ifconfig hme0 removeif ip_address_of_virtual_interface
2. # edit /etc/hostname.<driver> file to remove the entry
To remove virtual interface which is not up or have been used with same IP address
e.g.:
ge0:1: flags=1000843<UP,BROADCAST,RUNNING,MULTICAST,IPv4> mtu 1500 index 2
inet 3.177.70.113 netmask ffffff00 broadcast 3.177.70.255
ge0:77: flags=1000842<BROADCAST,RUNNING,MULTICAST,IPv4< mtu 1500 index 2
inet 3.177.70.113 netmask ffffff00 broadcast 3.177.70.255
To remove interface ge0:77 which is not up
ifconfig ge0:77 unplumb