Adding and Configuring new network interface in Solaris 10

Query all interface information
ifconfig -a
lo0: flags=2001000849 mtu 8232 index 1
        inet 127.0.0.1 netmask ff000000
e1000g0: flags=1000843 mtu 1500 index 2
        inet 192.168.1.1 netmask ffffff00 broadcast 192.168.1.255
        ether 0:c:29:21:12:f5

Plumb all interfaces

bash-3.2# ifconfig -a plumb

ifconfig: SIOCSLIFNAME for ip: e1000g0: already exists
bash-3.2#

Query again and you will see newly added network interface

bash-3.2# ifconfig -a
lo0: flags=2001000849 mtu 8232 index 1
        inet 127.0.0.1 netmask ff000000
e1000g0: flags=1000843 mtu 1500 index 2
        inet 192.168.1.1 netmask ffffff00 broadcast 192.168.1.255
        ether 0:c:29:21:12:f5
e1000g1: flags=1000842 mtu 1500 index 3
        inet 0.0.0.0 netmask 0
        ether 0:c:29:21:12:ff
bash-3.2#

Configure new interface

bash-3.2# ifconfig e1000g1 10.10.10.1 netmask 255.255.255.0 up
bash-3.2# ifconfig -a
lo0: flags=2001000849 mtu 8232 index 1
        inet 127.0.0.1 netmask ff000000
e1000g0: flags=1000843 mtu 1500 index 2
        inet 192.168.1.1 netmask ffffff00 broadcast 192.168.1.255
        ether 0:c:29:21:12:f5
e1000g1: flags=1000843 mtu 1500 index 3
        inet 10.10.10.1 netmask ffffff00 broadcast 10.10.10.255
        ether 0:c:29:21:12:ff
==========================================================
Make changes permanent

bash-3.2# ls -ltr /etc/hostname*
-rw-r--r--   1 root     root           9 Jan 31 06:12 /etc/hostname.e1000g0

Create file for new interface e1000g1

bash-3.2# gedit /etc/hostname.e1000g1
bash-3.2# ls -ltr /etc/hostname*
-rw-r--r--   1 root     root           9 Jan 31 06:12 /etc/hostname.e1000g0
-rw-r--r--   1 root     root          14 Jan 31 06:46 /etc/hostname.e1000g1

reboot machine

bash-3.2# reboot