How to add additional IPs and subnets to your dedicated server

To use any additional IPs or subnets you have purchased you may need to configure additional interfaces for them to function. The process of adding interfaces is similar to all Linux distributions and users should follow this post taking note of the steps required for your specific OS.

Always take a backup of your network configuration settings before making any changes to the network configuration. If you make a mistake its possible you will lose the connection to your server and you will have to boot the server in rescue mode to revert any changes you have made.

This guide is specifically written for use with First2Host dedicated servers. If you follow this guide and you do not have a First2Host dedicated server you could break the connection to your server. 

Log in as the root user and the enter the commands listed under your specific OS

CentOS / Red Hat / Fedora / Scientific Linux

Take a copy of the eth0 interface and rename it eth0:0

cp /etc/sysconfig/network-scripts/ifcfg-eth0 /etc/sysconfig/network-scripts/ifcfg-eth0:0

Now open up the new eth device you just created

cd /etc/sysconfig/network-scripts/ ; nano /etc/sysconfig/network-scripts/ifcfg-eth0:0

Remove everything from the file and replace it with the below. Add your additional IP where required

DEVICE="eth0:0"
ONBOOT="yes"
BOOTPROTO="static"
IPADDR="ADDITIONAL_IP"
NETMASK="255.255.255.255"
BROADCAST="ADDITIONAL_IP "

Save and close the file then bring up the new eth device by running

ifup eth0:0

Dedicated Server Hosting

 

The IP should now be usable. If this does not bring up the IP reboot the server, repeat the process to add more IPs using UNIQUE devices like eth0:1, eth0:2

DEVICE="eth0:1"
ONBOOT="yes"
BOOTPROTO="static"
IPADDR="ADDITIONAL_IP"
NETMASK="255.255.255.255"
BROADCAST="ADDITIONAL_IP "

Remember to bring each interface up after you create it

ifup eth0:1

Debian / Ubuntu 

Taker a copy of the interfaces file in case of any errors

cp /etc/network/interfaces /etc/network/interfaces.backup

Next, open up the interfaces file using your favorite editor

nano /etc/network/interfaces

Server-IP-minus-last-octet = your server IP minus the last .X

You interface file will look like this

# The loopback network interface
auto lo
iface lo inet loopback
auto eth0
iface eth0 inet static
        address Server-IP
        netmask 255.255.255.0
        network Server-IP-minus-last-octet.0
        broadcast 193.70.92.255
        gateway Server-IP-minus-last-octet.254
iface eth0 inet6 static
        address 2001:41d0:0303:085e::
        netmask 64
        dns-nameservers 2001:41d0:3:163::1
        post-up sleep 5; /sbin/ip -family inet6 route add 2001:41d0:0303:08ff:ff:ff:ff:ff dev eth0
        post-up sleep 5; /sbin/ip -family inet6 route add default via 2001:41d0:0303:08ff:ff:ff:ff:ff
        pre-down /sbin/ip -family inet6 route del default via 2001:41d0:0303:08ff:ff:ff:ff:ff
        pre-down /sbin/ip -family inet6 route del 2001:41d0:0303:08ff:ff:ff:ff:ff dev eth0

To add additional IPs just create secondary interfaces for each IP

auto eth0:1
iface eth0:1 inet static
address IP_HERE
netmask 255.255.255.255
broadcast IP_HERE
auto eth0:2
iface eth0:2 inet static
address IP_HERE
netmask 255.255.255.255
broadcast IP_HERE

So your interfaces file would look like this if you had two additional IPs routed to the server

auto eth0
iface eth0 inet static
        address 192.168.2.1
        netmask 255.255.255.0
        network 192.168.2.0
        broadcast 193.70.92.255
        gateway 192.168.2.254
iface eth0 inet6 static
        address 2001:44d3:0403:085e::
        netmask 64
        dns-nameservers 2001:41d0:3:163::1
        post-up sleep 5; /sbin/ip -family inet6 route add 2001:41d0:0303:08ff:ff:ff:ff:ff dev eth0
        post-up sleep 5; /sbin/ip -family inet6 route add default via 2001:41d0:0303:08ff:ff:ff:ff:ff
        pre-down /sbin/ip -family inet6 route del default via 2001:41d0:0303:08ff:ff:ff:ff:ff
        pre-down /sbin/ip -family inet6 route del 2001:41d0:0303:08ff:ff:ff:ff:ff dev eth0
auto eth0:1
iface eth0:1 inet static
address 192.168.2.2
netmask 255.255.255.255
broadcast 192.168.2.2
auto eth0:2
iface eth0:2 inet static
address 192.168.2.3
netmask 255.255.255.255
broadcast 192.168.2.3

Save and close the file then reboot the server. The IPs should not be usable. Remember to use UNIQUE  eth0:X interfaces. If after following this guide you can not ping your IPs please contact support who will advise further.

How to add additional IPs and subnets to your dedicated server
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