To configure an additional public IPv4 address in Ubuntu, proceed as follows:
In the Cloud Panel you have assigned an additional public IPv4 address to your server.
You have logged in to the server.
To configure the main IP address as static, you must change in /etc/network/interfaces the entry for eth0. To carry out this change, enter the following:
auto eth0 iface eth0 inet static address ABC.DEF.GHI.JKL netmask 255.255.255.255 network ABC.DEF.GHI.0 broadcast ABC.DEF.GHI.JKL gateway 10.255.255.1 # static routes up route add –net 10.255.255.1 netmask 255.255.255.255 dev eth0 up route add –net 0.0.0.0 netmask 0.0.0.0 gw 10.255.255.1 dev eth0
Enter your main IP address at IPADDR and BROADCAST. Enter your main IP address and the number 0 at NETWORK.
Apply the rest of the settings as indicated above.
To add your additional IP as an alias (eth0:0), enter the following:
auto eth0:0 iface eth0:0 inet static address ABC.DEF.GHI.JKL netmask 255.255.255.255 network ABC.DEF.GHI.0 broadcast ABC.DEF.GHI.JKL gateway 10.255.255.1
To restart the network, enter the following command: