How to add secondary IP address using nmcli

On an AlmaLinux 9 server, I wanted to add secondary IPs to a server. First, I checked the network interface device name used in the server with the command

ip a

The current public IP address was assigned to the network interface with the name enp13s0. To see how it is configured, I run

cd /etc
grep -irl enp13s0

That showed the server am using Network Manager to configure the IP address

[root@node4 etc]# grep -irl enp13s0
NetworkManager/system-connections/enp13s0.nmconnection
[root@node4 etc]# 

You can add additional IP adding using nmcli command.

nmcli con mod DEVICE_NAME +ipv4.addresses "IP_ADDR/24"

Example

nmcli con mod enp13s0 +ipv4.addresses "67.222.158.35/24"
nmcli con mod enp13s0 +ipv4.addresses "67.222.158.36/24"
nmcli con mod enp13s0 +ipv4.addresses "67.222.158.37/24"
nmcli con mod enp13s0 +ipv4.addresses "67.222.158.38/24"
nmcli con mod enp13s0 +ipv4.addresses "67.222.158.39/24"
nmcli con mod enp13s0 +ipv4.addresses "67.222.158.40/24"
nmcli con mod enp13s0 +ipv4.addresses "67.222.158.41/24"

To make the IPs online, run

nmcli con up enp13s0

Now ip a command lists all secondary IP addresses

[root@node4 etc]# ip a show enp13s0
2: enp13s0:  mtu 1500 qdisc fq_codel state UP group default qlen 1000
    link/ether 74:56:3c:31:38:0a brd ff:ff:ff:ff:ff:ff
    inet 67.222.158.34/24 brd 67.222.158.255 scope global noprefixroute enp13s0
       valid_lft forever preferred_lft forever
    inet 67.222.158.35/24 brd 67.222.158.255 scope global secondary noprefixroute enp13s0
       valid_lft forever preferred_lft forever
    inet 67.222.158.36/24 brd 67.222.158.255 scope global secondary noprefixroute enp13s0
       valid_lft forever preferred_lft forever
    inet 67.222.158.37/24 brd 67.222.158.255 scope global secondary noprefixroute enp13s0
       valid_lft forever preferred_lft forever
    inet 67.222.158.38/24 brd 67.222.158.255 scope global secondary noprefixroute enp13s0
       valid_lft forever preferred_lft forever
    inet 67.222.158.39/24 brd 67.222.158.255 scope global secondary noprefixroute enp13s0
       valid_lft forever preferred_lft forever
    inet 67.222.158.40/24 brd 67.222.158.255 scope global secondary noprefixroute enp13s0
       valid_lft forever preferred_lft forever
    inet 67.222.158.41/24 brd 67.222.158.255 scope global secondary noprefixroute enp13s0
       valid_lft forever preferred_lft forever
    inet6 fe80::7656:3cff:fe31:380a/64 scope link noprefixroute 
       valid_lft forever preferred_lft forever
[root@node4 etc]# 

To list all network interface devices using nmcli, run

[root@node4 etc]# nmcli connection show
NAME          UUID                                  TYPE      DEVICE       
enp13s0       4ca2de2f-1f4d-38e2-84fc-4d17aafc2514  ethernet  enp13s0      
docker0       521f050e-7870-43b3-a6ca-618d45116b03  bridge    docker0      
[root@node4 etc]# 

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