Assign Additional IP Addresses in RedHat/CentOS

If you are using cPanel, you should add the IP addresses through WHM.  Do not follow these instructions if you are using CPanel.

1. Determine what existing range files exist:

# cd /etc/sysconfig/network-scripts/
# ls ifcfg-eth1-range*

You will see at least one file, possibly several. Find the highest number following the "range" and add one to it. This will be the new range number.

For example, if you see ifcfg-eth1-range0 and ifcfg-eth1-range1, your new range number will be "2".

2. Determine the next available interface number (clone number).

# ifconfig | grep eth1

You will see a list of interfaces that looks like this
eth1 Link encap:Ethernet HWaddr 00:08:74:A3:29:70
eth1:0 Link encap:Ethernet HWaddr 00:08:74:A3:29:70
eth1:1 Link encap:Ethernet HWaddr 00:08:74:A3:29:70
eth1:8 Link encap:Ethernet HWaddr 00:08:74:A3:29:70

Find the highest number after the "eth1:". Add one to it and this your new clone number. In this case it would be 9.

3. create a range file for the new range number. (for this example, we will use range2)

# nano ifcfg-eth1-range2

4. Write the following lines to the range file. (replace the dummy ip information with your desired ip range and the CLONENUM_START value with the one calculated above)


5. Write and quit the range file, and restart your network.

# /etc/init.d/network restart

6. Your new ips should now be visible by running:

# ifconfig

Was this answer helpful?

 Print this Article

Also Read

Install vnStat Network Traffic Monitor To Keep a Log Of Daily Traffic on CentOS / RHEL

How do I install vnstat software - a console-based network traffic monitor under CentOS or RHEL...

Change hostname CentOS 7.x

[1]. Change hostname. (but if rebooting, it will be back). # show current hostname...

Setting up IPtables

1. Introduction CentOS has an extremely powerful firewall built in, commonly referred to as...

I Need the Kernel Source

1. Maybe you do not need the full kernel source If you need to compile a...

Resetting a lost MySQL root password

The MySQL root password allows full access to the MySQL database and allows for all actions to be...