{"id":10526,"date":"2021-10-09T08:53:34","date_gmt":"2021-10-09T05:53:34","guid":{"rendered":"https:\/\/kifarunix.com\/?p=10526"},"modified":"2024-03-18T13:47:58","modified_gmt":"2024-03-18T10:47:58","slug":"create-virtual-secondary-ip-addresses-on-an-interface-in-linux","status":"publish","type":"post","link":"https:\/\/kifarunix.com\/create-virtual-secondary-ip-addresses-on-an-interface-in-linux\/","title":{"rendered":"Create Virtual\/Secondary IP addresses on an Interface in Linux"},"content":{"rendered":"\n

Follow through this tutorial to learn how to create virtual\/secondary IP addresses on an interface in Linux. This enables you to assign multiple IP addresses to a single interface.<\/p>\n\n\n\n

Creatin Virtual IP addresses on a Linux Interface <\/h2>\n\n\n\n

You can create virtual IP addresses on an interface temporarily or permanently.<\/p>\n\n\n\n

Create Temporary Virtual IP addresse<\/h3>\n\n\n\n

To create temporary virtual\/secondary IP addresses on an interface in Linux, you can use commands such as ip<\/code><\/strong>, ifconfig<\/code><\/strong>.<\/p>\n\n\n\n

To use ip<\/code><\/strong> command to create\/add secondary IP addresses to an interface, see the examples below.<\/p>\n\n\n\n

In our example server, we have an interface called enp0s8<\/code>.<\/p>\n\n\n\n

Checking the current IP address of the interface;<\/p>\n\n\n\n

ip add show dev enp0s8<\/code><\/pre>\n\n\n\n
\n3: enp0s8:  mtu 1500 qdisc fq_codel state UP group default qlen 1000\n    link\/ether 08:00:27:c4:23:c9 brd ff:ff:ff:ff:ff:ff\n    inet 192.168.56.108\/24 brd 192.168.56.255 scope global noprefixroute enp0s8\n       valid_lft forever preferred_lft forever\n    inet6 fe80::d524:3777:b321:5ed\/64 scope link noprefixroute \n       valid_lft forever preferred_lft forever\n<\/code><\/pre>\n\n\n\n
The primary IP address assigned to the interface is 192.168.56.108<\/strong><\/code>.<\/p>\n\n\n\n
Assuming we want to temporarily assign a secondary IP address, 192.168.56.10<\/strong>9<\/code>, to the interface using the ip<\/code><\/strong> command;<\/p>\n\n\n\n
ip addr add 192.168.56.109\/24 br 192.168.56.255 dev enp0s8<\/code><\/pre>\n\n\n\n
The addr<\/code><\/strong> and br<\/code><\/strong> are abbreviations for address<\/code><\/strong> and broadcast<\/code><\/strong> respectively.<\/p>\n\n\n\n
Confirming the secondary IP address assignment;<\/p>\n\n\n\n
ip add show dev enp0s8<\/code><\/pre>\n\n\n\n
\n3: enp0s8:  mtu 1500 qdisc fq_codel state UP group default qlen 1000\n    link\/ether 08:00:27:c4:23:c9 brd ff:ff:ff:ff:ff:ff\n    inet 192.168.56.108\/24 brd 192.168.56.255 scope global dynamic noprefixroute enp0s8\n       valid_lft 394sec preferred_lft 394sec\n    inet 192.168.56.109\/24 brd 192.168.56.255 scope global secondary enp0s8 <\/strong>\n       valid_lft forever preferred_lft forever\n    inet6 fe80::d524:3777:b321:5ed\/64 scope link noprefixroute \n       valid_lft forever preferred_lft forever\n<\/code><\/pre>\n\n\n\n
If you restart the networking\/take the interface up and down or reboot your server, you will loose the assigned IP address.<\/p>\n\n\n\n
Create Permanent Virtual IP addresses<\/h3>\n\n\n\n
Create secondary IP addresses using nmcli command<\/h4>\n\n\n\n
On CentOS and Similar derivatives, you can use simply use the NetworkManager command line tool, nmcli<\/code><\/strong>.<\/p>\n\n\n\n
The command may not be available by default on Ubuntu\/Debian systems. If so and want to use it, then install the network manager package (network-manager<\/code><\/strong>).<\/p>\n\n\n\n
First confirm the interface connection name;<\/p>\n\n\n\n
nmcli con show<\/code><\/pre>\n\n\n\n
con<\/code> is an abbreviation for connection<\/code>.<\/p>\n\n\n\n
Sample output;<\/p>\n\n\n\n
NAME                UUID                                  TYPE      DEVICE \nenp0s8              e59e1c2f-bda2-4704-9f4a-67e8cce636d9  ethernet  enp0s8 \nWired connection 1  a7d294d4-05d9-3724-832e-6b80dc288a24  ethernet  enp0s3<\/code><\/pre>\n\n\n\n
In this case, we want to add virtual\/secondary IP to interface enp0s8<\/code><\/strong>, connection name enp0s8<\/code><\/strong>.<\/p>\n\n\n\n
This can be done using nmcli<\/strong><\/code> command as follows. Pay attention to plus(+)ipv4.addresses<\/code>.<\/p>\n\n\n\n
nmcli con mod enp0s8 +ipv4.addresses 192.168.56.109\/24<\/code><\/pre>\n\n\n\n
mod<\/code> is an abbreviation for modify<\/code>.<\/p>\n\n\n\n
Take down and bring up the interface. I Assume you are directly logged in via console<\/strong> and not via ssh.<\/p>\n\n\n\n
nmcli con down enp0s8 && nmcli con up enp0s8<\/code><\/pre>\n\n\n\n
Confirm the secondary IP address assignment.<\/p>\n\n\n\n
ip add show dev enp0s8<\/code><\/pre>\n\n\n\n
\n3: enp0s8:  mtu 1500 qdisc fq_codel state UP group default qlen 1000\n    link\/ether 08:00:27:c4:23:c9 brd ff:ff:ff:ff:ff:ff\n    inet 192.168.56.108\/24 brd 192.168.56.255 scope global noprefixroute enp0s8\n       valid_lft forever preferred_lft forever\n    inet 192.168.56.109\/24 brd 192.168.56.255 scope global secondary noprefixroute enp0s8\n       valid_lft forever preferred_lft forever\n    inet6 fe80::d524:3777:b321:5ed\/64 scope link noprefixroute \n       valid_lft forever preferred_lft forever\n<\/code><\/pre>\n\n\n\n
To remove the secondary IP address using nmcli command, just use minus(-)ipv4.addresses<\/code><\/strong>.<\/p>\n\n\n\n
nmcli con mod enp0s8 -ipv4.addresses 192.168.56.109\/24<\/code><\/pre>\n\n\n\n
nmcli con down enp0s8 && nmcli con up enp0s8<\/code><\/pre>\n\n\n\n
Create Secondary IP addresses using nmtui (Network Manager  GUI)<\/h4>\n\n\n\n
nmtui<\/code><\/strong> is available if you have installed Network manager package.<\/p>\n\n\n\n
Launch nmtui<\/code><\/strong> from the terminal (you can use tab key to navigate through the settings);<\/p>\n\n\n\n
nmtui<\/code><\/pre>\n\n\n\n
Select Edit a connection<\/strong> and click Ok<\/strong>.<\/p>\n\n\n
\n
\"Create<\/figure><\/div>\n\n\n
Select the Interface to edit, which in this example is enp0s8<\/code><\/strong> and click Edit<\/strong>;<\/p>\n\n\n
\n
\"\"<\/figure><\/div>\n\n\n
Scroll down to IPV4 configuration and click Add<\/strong> and enter your IP address.<\/p>\n\n\n
\n
\"\"<\/figure><\/div>\n\n\n
Next, click Ok<\/strong> at the bottom > Back<\/strong> > Activate a connection<\/strong> > Ok<\/strong>.<\/p>\n\n\n\n
Select and deactivate the interface.<\/p>\n\n\n
\n
\"\"<\/figure><\/div>\n\n\n
Select the interface and activate it again.<\/p>\n\n\n
\n
\"\"<\/figure><\/div>\n\n\n
Select Back<\/strong> > Quit<\/strong>.<\/p>\n\n\n\n
Confirm the IP address assignment.<\/p>\n\n\n\n
ip add show dev enp0s8<\/code><\/pre>\n\n\n\n
ip add show dev enp0s8<\/code><\/pre>\n\n\n\n
\n3: enp0s8:  mtu 1500 qdisc fq_codel state UP group default qlen 1000\n    link\/ether 08:00:27:c4:23:c9 brd ff:ff:ff:ff:ff:ff\n    inet 192.168.56.108\/24 brd 192.168.56.255 scope global noprefixroute enp0s8\n       valid_lft forever preferred_lft forever\n    inet 192.168.56.109\/24 brd 192.168.56.255 scope global secondary noprefixroute enp0s8\n       valid_lft forever preferred_lft forever\n    inet6 fe80::d524:3777:b321:5ed\/64 scope link noprefixroute \n       valid_lft forever preferred_lft forever\n<\/code><\/pre>\n\n\n\n
You can similarly remove this using nmcli command or right from the nmtui tool.<\/strong><\/p>\n\n\n\n
Create Secondary IP address on Ubuntu<\/h3>\n\n\n\n
To create a permanent IP address on Ubuntu 18.04\/Ubuntu 20.04 systems, which uses netplan to manage the network interfaces, then you can proceed as follows;<\/p>\n\n\n\n
Check the current IP address for the interface;<\/p>\n\n\n\n
ip add show dev enp0s8<\/code><\/pre>\n\n\n\n
\n3: enp0s8:  mtu 1500 qdisc fq_codel state UP group default qlen 1000\n    link\/ether 08:00:27:56:39:94 brd ff:ff:ff:ff:ff:ff\n    inet 192.168.59.14\/24 brd 192.168.59.255 scope global enp0s8\n       valid_lft forever preferred_lft forever\n    inet6 fe80::a00:27ff:fe56:3994\/64 scope link \n       valid_lft forever preferred_lft forever\n<\/code><\/pre>\n\n\n\n
The current netplan configuration for my interfaces;<\/p>\n\n\n\n
cat \/etc\/netplan\/00-installer-config.yaml<\/code><\/pre>\n\n\n\n
\nnetwork:\n  ethernets:\n    enp0s3:\n      dhcp4: true\n    enp0s8:\n      dhcp4: no\n      addresses: [192.168.59.14\/24]\n      routes:\n              - to: 0.0.0.0\/0\n                via: 192.168.59.1\n                metric: 101\n      nameservers:\n              addresses: [8.8.8.8]<\/strong>\n  version: 2\n<\/code><\/pre>\n\n\n\n
To add a secondary IP address to the interface, edit the configuration file<\/p>\n\n\n\n
cp \/etc\/netplan\/00-installer-config.yaml{,.old}<\/code><\/pre>\n\n\n\n
vim \/etc\/netplan\/00-installer-config.yaml<\/code><\/pre>\n\n\n\n
and update the line;<\/p>\n\n\n\n
addresses: [192.168.59.14\/24]<\/code><\/pre>\n\n\n\n
Such that it may look like;<\/p>\n\n\n\n
addresses: [192.168.59.14\/24, 192.168.59.15\/24]<\/code><\/pre>\n\n\n\n
The config now looks like;<\/p>\n\n\n\n
\nnetwork:\n  ethernets:\n    enp0s3:\n      dhcp4: true\n    enp0s8:\n      dhcp4: no\n      addresses: [192.168.59.14\/24, 192.168.59.15\/24]\n      routes:\n              - to: 0.0.0.0\/0\n                via: 192.168.59.1\n                metric: 101\n      nameservers:\n              addresses: [8.8.8.8]<\/strong>\n  version: 2\n<\/code><\/pre>\n\n\n\n
Apply the configuration changes;<\/p>\n\n\n\n
netplan apply<\/code><\/pre>\n\n\n\n
The confirm the IP address assignment<\/p>\n\n\n\n
ip add show dev enp0s8<\/code><\/pre>\n\n\n\n
Create Secondary IP address on Debian systems<\/h3>\n\n\n\n
Similarly, update the interfaces as follows, to add the secondary IP address.<\/p>\n\n\n\n
Sample interface configurations;<\/p>\n\n\n\n
cat \/etc\/network\/interfaces<\/code><\/pre>\n\n\n\n
\nsource \/etc\/network\/interfaces.d\/*\n\n# The loopback network interface\nauto lo\niface lo inet loopback\n\n# The primary network interface\nallow-hotplug enp0s3\niface enp0s3 inet dhcp\n\nauto enp0s8\niface enp0s8 inet static\n\taddress 192.168.58.22\n\tnetmask 255.255.255.0\n\tgateway 192.168.58.1\n\tbroadcast 192.168.58.255\n\tdns-nameservers 8.8.8.8\n<\/code><\/pre>\n\n\n\n
To add a secondary IP address;<\/p>\n\n\n\n
cp \/etc\/network\/interfaces{,.old}<\/code><\/pre>\n\n\n\n
update the config as follows<\/p>\n\n\n\n
vim \/etc\/network\/interfaces<\/code><\/pre>\n\n\n\n
\nsource \/etc\/network\/interfaces.d\/*\n\n# The loopback network interface\nauto lo\niface lo inet loopback\n\n# The primary network interface\nallow-hotplug enp0s3\niface enp0s3 inet dhcp\n\nauto enp0s8\niface enp0s8 inet static\n\taddress 192.168.58.22\n\tnetmask 255.255.255.0\n\tgateway 192.168.58.1\n\tbroadcast 192.168.58.255\n\tdns-nameservers 8.8.8.8\nauto enp0s8:0\niface enp0s8:0 inet static\n\taddress 192.168.58.23\n\tnetmask 255.255.255.0<\/strong>\n<\/code><\/pre>\n\n\n\n
see the added configs;<\/p>\n\n\n\n
auto enp0s8:0\niface enp0s8:0 inet static\n\taddress 192.168.58.23\n\tnetmask 255.255.255.0<\/code><\/pre>\n\n\n\n
Save and exit the config and restart the networking;<\/p>\n\n\n\n
systemctl restart networking<\/code><\/pre>\n\n\n\n
Confirm IP address;<\/p>\n\n\n\n
ip add show dev enp0s8<\/code><\/pre>\n\n\n\n
\n3: enp0s8:  mtu 1500 qdisc pfifo_fast state UP group default qlen 1000\n    link\/ether 08:00:27:2b:b4:61 brd ff:ff:ff:ff:ff:ff\n    inet 192.168.58.22\/24 brd 192.168.58.255 scope global enp0s8\n       valid_lft forever preferred_lft forever\n    inet 192.168.58.23\/24 brd 192.168.58.255 scope global secondary enp0s8:0\n       valid_lft forever preferred_lft forever\n    inet6 fe80::a00:27ff:fe2b:b461\/64 scope link \n       valid_lft forever preferred_lft forever\n<\/code><\/pre>\n\n\n\n
Other Tutorials<\/h2>\n\n\n\n
Connect to WiFi in Linux Using NMCLI command<\/a><\/p>\n\n\n\n
Assign Static IP Addresses for OpenVPN Clients<\/a><\/p>\n\n\n\n
Configure Static IP Addresses using Netplan on Ubuntu 20.04\/18.04<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"
Follow through this tutorial to learn how to create virtual\/secondary IP addresses on an interface in Linux. This enables you to assign multiple IP addresses<\/p>\n","protected":false},"author":1,"featured_media":10623,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"rank_math_lock_modified_date":false,"footnotes":""},"categories":[63,121,68],"tags":[4150,4149,4153,4158,673,4155,4157,4156,4151],"class_list":["post-10526","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-networking","category-howtos","category-netplan","tag-create-secondary-ip-linux","tag-create-virtual-ip-address-in-linux-interface","tag-create-virtual-ip-in-linux-using-nmtui","tag-debian","tag-nmcli","tag-nmtui","tag-secondary-ip-centos","tag-virtual-ip","tag-virtual-ip-nmcli-command","generate-columns","tablet-grid-50","mobile-grid-100","grid-parent","grid-50","resize-featured-image"],"_links":{"self":[{"href":"https:\/\/kifarunix.com\/wp-json\/wp\/v2\/posts\/10526"}],"collection":[{"href":"https:\/\/kifarunix.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/kifarunix.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/kifarunix.com\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/kifarunix.com\/wp-json\/wp\/v2\/comments?post=10526"}],"version-history":[{"count":6,"href":"https:\/\/kifarunix.com\/wp-json\/wp\/v2\/posts\/10526\/revisions"}],"predecessor-version":[{"id":21648,"href":"https:\/\/kifarunix.com\/wp-json\/wp\/v2\/posts\/10526\/revisions\/21648"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/kifarunix.com\/wp-json\/wp\/v2\/media\/10623"}],"wp:attachment":[{"href":"https:\/\/kifarunix.com\/wp-json\/wp\/v2\/media?parent=10526"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kifarunix.com\/wp-json\/wp\/v2\/categories?post=10526"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kifarunix.com\/wp-json\/wp\/v2\/tags?post=10526"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}