Adding an extra or static IPv4 or IPv6 address in CentOS Stream 10, AlmaLinux 10 or RockyLinux 10

Step 1

Open the network configuration. This is usually located in /etc/sysconfig/network-scripts/ (replace eth0 with the adapter name you found in step 2).

sudo nano /etc/sysconfig/network-scripts/ifcfg-eth0

Step 2

Adjust the configuration so that it looks like the example below, replacing the IP addresses with those of your own VPS.

AUTOCONNECT_PRIORITY=120
BOOTPROTO=none
DEVICE=eth0
ONBOOT=yes
TYPE=ethernet
IPV4_FAILURE_FATAL=no
IPADDR=149.210.111.222
IPADDR1=149.210.222.111
NETMASK=255.255.255.0
NETMASK1=255.255.255.0
PREFIX=24
PREFIX1=24
GATEWAY=149.210.111.1
GATEWAY1=149.210.222.1

• IPADDR(x) is the IP address you want to configure and GATEWAY(x) is the gateway; you can find these for your IP address in the control panel.
• For each IP address you add, increase the number: IPADDR, IPADDR1, IPADDR2, IPADDR3, etc. The same applies to gateways where relevant. Leave the (sub)NETMASK at 255.255.255.0.
• It’s not mandatory to add the gateway when the extra IP address is in the same /24 range. If that’s not the case, you must add it, otherwise you’ll run into issues reaching other IPs within the TransIP network.

Save your changes and exit nano (ctrl + x > y > enter).

Step 3

Restart NetworkManager to apply the new IP configuration:

sudo systemctl restart NetworkManager

Step 1

CentOS 9, AlmaLinux 9 and Rocky Linux 9 use a ‘keyfile’ system instead of the NetworkManager configuration files you might be familiar with. You manage these in a different way, using a graphical command-line tool called ‘nmtui’. Start it with:

sudo nmtui

Step 2

You’ll see the menu below. The ‘Edit a connection’ option is selected by default. Press ‘Enter’ to continue.

Step 3

Next, select the adapter name from step 2 (you’ll usually only see a single adapter here) and press ‘Enter’.

Step 4

For ‘IPv4 CONFIGURATION’, select ‘Automatic’. Press ‘Enter’, then select ‘Manual’ and press ‘Enter’ again.

Now use the right arrow keys to select ‘Show’ and press ‘Enter’. Adjust the configuration as in the example below, with the following changes:

• Replace 136.144.131.92/24 with the primary IPv4 address of your VPS. Don’t forget to include the /24 subnet.
• Want to add more IP addresses? Select ‘Add’ and add the additional IPs.
• Set the gateway to the IPv4 gateway of your primary IPv4 address. You can find this in the control panel for your VPS under ‘Beheren’ > ‘Netwerkinformatie’.
• For the DNS servers, configure the available IPv4 addresses of the DNS servers, which you can also find in your control panel under ‘Netwerkinformatie’.
• Don’t forget to tick ‘Ignore automatically obtained routes’ and ‘Ignore automatically obtained DNS parameters’.

Finally, select ‘OK’ at the bottom and press ‘Enter’ to apply the changes.

Step 5

You’ll be taken back to the screen from step 5. Press ‘Esc’ to go back one screen, select ‘Quit’ and press ‘Enter’ to close nmtui.

Step 6

Finally, apply the changes with:

sudo nmcli networking off && sudo nmcli networking on

Step 1

Open the network configuration. This is usually located in /etc/sysconfig/network-scripts/ (replace eth0 with the adapter name you found in step 2).

sudo nano /etc/sysconfig/network-scripts/ifcfg-eth0

Step 2

In the opened configuration file, add the lines below if they’re not present yet. Use the primary IPv6 address and its corresponding gateway as shown in your control panel under ‘beheren’ > ‘netwerkinformatie’.

IPV6INIT=yes
IPV6_AUTOCONF=no
IPV6ADDR=2a01:7c8:aabb:111::1
IPV6_DEFAULTGW=2a01:7c8:aabb::1
IPV6_DEFROUTE=yes
IPV6_FAILURE_FATAL=no

Save your changes and exit nano (ctrl + x > y > enter). If you want to add more IPv6 addresses, add the following line (place all extra addresses between the quotation marks):

IPV6ADDR_SECONDARIES="2a01:7c8:aabb:111::2 2a01:7c8:aab:111::3"

Step 3

Restart NetworkManager to apply the new IP configuration:

sudo systemctl restart NetworkManager

Step 1

CentOS 9, AlmaLinux 9 and Rocky Linux 9 use a ‘keyfile’ system instead of the NetworkManager configuration files you might be familiar with. You manage these in a different way, using a graphical command-line tool called ‘nmtui’. Start it with:

sudo nmtui

You’ll see the menu below. The ‘Edit a connection’ option is selected by default. Press ‘Enter’ to continue.

Step 2

Next, select the adapter name from step 2 (you’ll usually only see a single adapter here) and press ‘Enter’.

Step 3

For ‘IPv6 CONFIGURATION’, select ‘Automatic’. Press ‘Enter’, then select ‘Manual’ and press ‘Enter’ again.

Now use the right arrow keys to select ‘Show’ and press ‘Enter’. Adjust the configuration as in the example below, with the following changes:

• Replace 2a01:7c8:fff9:34c::/48 with the primary IPv6 address of your VPS. Don’t forget to include the /48 subnet.
• Want to add more IP addresses? Select ‘Add’ and add the additional IPs.
• Set the gateway to the IPv6 gateway of your primary IPv6 address. You can find this in the control panel for your VPS under ‘Beheren’ > ‘Netwerkinformatie’.
• For the DNS servers, configure the available IPv6 addresses of the DNS servers, which you can also find in your control panel under ‘Netwerkinformatie’.
• Don’t forget to tick ‘Ignore automatically obtained routes’ and ‘Ignore automatically obtained DNS parameters’.

Finally, select ‘OK’ at the bottom and press ‘Enter’ to apply the changes.

Step 4

You’ll be taken back to the screen from step 5. Press ‘Esc’ to go back one screen, select ‘Quit’ and press ‘Enter’ to close nmtui.

Step 5

Finally, apply the changes with:

sudo nmcli networking off && sudo nmcli networking on