{"id":10780,"date":"2024-12-10T06:38:09","date_gmt":"2024-12-10T06:38:09","guid":{"rendered":"https:\/\/blog.webystrata.co.uk\/?p=10780"},"modified":"2026-04-14T13:07:03","modified_gmt":"2026-04-14T13:07:03","slug":"how-to-add-an-ip-address-in-linux","status":"publish","type":"post","link":"https:\/\/www.webystrata.co.uk\/blog\/how-to-add-an-ip-address-in-linux\/","title":{"rendered":"How to Add an IP Address in Linux"},"content":{"rendered":"

<\/h1>\n

\"How<\/a>
\nHow to Add an IP Address in Linux<\/h1>\n
\n

You should speak with your account manager to have an IP address assigned to you before adding IPs to your server<\/a>.<\/p><\/blockquote>\n<\/div>\n

The quickest way to add an IP on either CentOS or Ubuntu would be to use the\u00a0ip<\/span><\/code>\u00a0command as follows:<\/p>\n

\n
\n
\n
   ip addr add 10<\/span>.10.10.10\/28 brd + dev eth0\r\n<\/pre>\n<\/blockquote>\n<\/div>\n<\/div>\n
That example would add an IP of\u00a010.10.10.10<\/span><\/code>\u00a0with a netmask of\u00a0255.255.255.240<\/span><\/code>\u00a0(CIDR\u00a0\/28<\/span><\/code>) onto the interface\u00a0eth0<\/span><\/code>.<\/p>\n
Although there\u2019s nothing wrong with that command, the IP won\u2019t persist beyond a reboot.<\/p>\n
For that, we\u2019ll need to add it the respective network configuration file for our operating system.<\/p>\n
\n
CentOS<\/h2>\n
On CentOS 5, 6 and 7, IP addresses are added in files in the following directory:<\/p>\n
\n
\n
\n
   \/etc\/sysconfig\/network-scripts<\/span>\r\n<\/pre>\n<\/blockquote>\n<\/div>\n<\/div>\n
Files should be created with the name\u00a0ifcfg-ethX<\/span><\/code>\u00a0and have the following content:<\/p>\n
\n
\n
\n
   DEVICE=eth0:1<\/span>\r\n   ONBOOT=yes<\/span>\r\n   BOOTPROTO=static<\/span>\r\n   IPADDR=192.168.0.1<\/span>\r\n   NETMASK=255.255.255.0<\/span>\r\n<\/pre>\n<\/blockquote>\n<\/div>\n<\/div>\n
Once you\u2019ve added the your configuration file, bring the interface up with the\u00a0ifup<\/span><\/code>\u00a0command:<\/p>\n
\n
\n
\n
ifup eth0:1\r\n<\/pre>\n<\/blockquote>\n<\/div>\n<\/div>\n<\/section>\n
\n
Ubuntu<\/h2>\n
On Ubuntu, all the network config is typically stored in one file:\u00a0\/etc\/network\/interfaces<\/span><\/code><\/p>\n
This file should already exist as it\u2019ll have your existing network configuration in place.<\/p>\n
Additional IP addresses should be added underneath the existing configuration with the following syntax:<\/p>\n
\n
\n
\n
   auto eth0:1<\/span>\r\n   iface eth0:1 inet static<\/span>\r\n      address 192.168.0.1<\/span>\r\n      netmask 255.255.255.0<\/span>\r\n<\/pre>\n<\/blockquote>\n<\/div>\n<\/div>\n
Again, the interface can be brought up with\u00a0ifup<\/span><\/code>, as so:<\/p>\n
\n
\n
\n
   ifup eth0:1<\/pre>\n<\/blockquote>\n<\/div>\n<\/div>\n<\/section>\n","protected":false},"excerpt":{"rendered":"
How to Add an IP Address in Linux You should speak with your account manager to have an IP address assigned to you before adding IPs to your server. The quickest way to add an IP on either CentOS or Ubuntu would be to use the\u00a0ip\u00a0command as follows: ip addr add 10.10.10.10\/28 brd + dev […]<\/p>\n","protected":false},"author":1,"featured_media":11501,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[9],"tags":[],"class_list":["post-10780","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-linux"],"_links":{"self":[{"href":"https:\/\/www.webystrata.co.uk\/blog\/wp-json\/wp\/v2\/posts\/10780","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.webystrata.co.uk\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.webystrata.co.uk\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.webystrata.co.uk\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.webystrata.co.uk\/blog\/wp-json\/wp\/v2\/comments?post=10780"}],"version-history":[{"count":2,"href":"https:\/\/www.webystrata.co.uk\/blog\/wp-json\/wp\/v2\/posts\/10780\/revisions"}],"predecessor-version":[{"id":11502,"href":"https:\/\/www.webystrata.co.uk\/blog\/wp-json\/wp\/v2\/posts\/10780\/revisions\/11502"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.webystrata.co.uk\/blog\/wp-json\/wp\/v2\/media\/11501"}],"wp:attachment":[{"href":"https:\/\/www.webystrata.co.uk\/blog\/wp-json\/wp\/v2\/media?parent=10780"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.webystrata.co.uk\/blog\/wp-json\/wp\/v2\/categories?post=10780"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.webystrata.co.uk\/blog\/wp-json\/wp\/v2\/tags?post=10780"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}