How to quickly bind a range of IPs on Centos based systems

In this short post I will show you how you can quickly add a range of IPs on any RedHat based system (Rhel, Centos, Fedora, etc). When you have to add many IPs to a system this can be quite handy and save a lot of time. Normally when you add a new IP to a network interface in a RedHat based system you create a file ifcfg-eth0:x in /etc/sysconfig/network-scripts/. For example:<blockquote><pre><code>/etc/sysconfig/network-scripts/ifcfg-eth0:0DEVICE=eth0:0ONBOOT=yesBOOTPROTO=staticIPADDR=192.168.0.100NETMASK=255.255.255.0NETWORK=192.168.0.0BROADCAST=192.168.0.255TYPE=Ethernet</code></pre></blockquote>Similar to the above example you can create several aliases. But what if you have to add a lot of IPs that are in a range like this? Let&rsquo;s say that I want to add 100 IPs this way&hellip; this is possible, but not very effective, right? RedHat based systems offer a method to bind a range of IPs in a quick way allowing us to eliminate the need to create a lot of files and saving us time doing this. Create a file /etc/sysconfig/network-scripts/ifcfg-eth0-range0 if this doesn&rsquo;t exist, or just add to it if you already have it, the following lines:<blockquote><pre><code>/etc/sysconfig/network-scripts/ifcfg-eth0-range0IPADDR_START=192.168.0.100IPADDR_END=192.168.0.200CLONENUM_START=0</code></pre></blockquote>where: IPADDR_START is the first IP and IPADDR_END is the last IP in the range. CLONENUM_START is the number that will be assigned to the first IP alias interface (eth0:0 in this example).If you need to add more ranges of IPs then just use a different file for ex. ifcfg-eth0-range1, for each one of the ranges. You need to be careful and use the proper CLONENUM_START to not overwrite other aliases. Once you have configured the range/s of IPs you just need to restart the network service in order to activate it:<blockquote><pre><code>service network restart</code></pre></blockquote>Note: don&rsquo;t use this method on a CPanel based system. Even though this will work fine, it is better to use CPanel/WHM in this case so CPanel can manage all the IPs properly. Here is a <a href="http://www.ducea.com/2006/07/15/cpanel-adding-a-range-of-ips-using-whm/" target="_blank">short post</a> on how you can do the same thing &lsquo;CPanel way&rsquo;.
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Last modification：July 14th, 2020 at 11:53 am

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