{"id":75,"date":"2018-11-26T14:15:52","date_gmt":"2018-11-26T14:15:52","guid":{"rendered":"http:\/\/tamer-az.com\/?p=75"},"modified":"2018-11-26T18:19:52","modified_gmt":"2018-11-26T18:19:52","slug":"adding-secondary-ip-addresses-centos-rhel%ef%bb%bf","status":"publish","type":"post","link":"https:\/\/tamer-az.com\/?p=75","title":{"rendered":"Adding Secondary IP Addresses (CentOS\/RHEL)\ufeff"},"content":{"rendered":"\n

There are plenty of reasons you would need to add secondary IP addresses (and everyone agrees that SEO<\/strong>is not one of them). Getting a secondary IP address is a simple process if it is done for the right reasons and done correctly. You do NOT need additional NIC cards but you will be creating virtual adapters as the secondary IP will be routing through the primary IP.<\/p>\n\n\n\n

 Also, this is a great thing to do athome as I’ve done it to run multiple internal IP addresses on one server to run multiple applications across the same ports (for KISS** sake). Please note that I am doing this is in a virtual testing environment so your settings will definitely be different.<\/p>\n\n\n\n

** KISS = Keep It Stupid Simple **<\/p>\n\n\n\n

You will need to be the root user and navigate to your \/etc\/sysconfig\/network-scripts<\/p>\n\n\n\n

#\ncd \/etc\/sysconfig\/network-scripts<\/p>\n\n\n\n

When getting a list of files in the directory you will see “ifcfg-eth0” (or eth1 if you’re doing it for a different adapter)<\/p>\n\n\n\n

#\nls -l | grep ifcfg-eth<\/p>\n\n\n\n

-rw-r–r–\n1 root root   119 Jan 11 19:16 ifcfg-eth0<\/p>\n\n\n\n

-rw-r–r–\n1 root root   119 Jan  3 08:45 ifcfg-eth0.bak<\/p>\n\n\n\n

-rw-r–r–\n1 root root   119 Feb 24 04:34 ifcfg-eth1<\/p>\n\n\n\n

-rw-r–r–\n1 root root   128 Jan 19 18:20\nifcfg-eth1.bak<\/p>\n\n\n\n

Now adding the virtual adapters is easy. Basically if the main adapter is called “eth0” you have to call the next (virtual) adapter in a sequential order like so:<\/p>\n\n\n\n