When you order an extra IPv4 address or add an extra IPv6 address to your IP addresses via the hoganhost control panel, these cannot be automatically added to your VPS via DHCP. Additional IP addresses are added manually to the network interfaces.
In this article, we explain how you can statically add an extra IPv4 or IPv6 address to your AlmaLinux 8 VPS. For this, an extra IPv4 and/or IPv6 address is required (depending on which you’d like to add / configure). Don’t have an extra address yet?
Adding an IPv4 address in CentOS 8
Step 1
Connect to the VPS via the VPS console or via SSH.
Step 2
Once logged in you see the current network interfaces and the configured IPs by using the command:
ip a
For the next steps, it is especially important that you are aware of the correct adapter name. Which is eth0 in this example.
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000 link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 inet 127.0.0.1/8 scope host lo valid_lft forever preferred_lft forever inet6 ::1/128 scope host valid_lft forever preferred_lft forever 2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000 link/ether 52:54:00:f6:ae:54 brd ff:ff:ff:ff:ff:ff inet 149.210.111.222/24 brd 149.210.111.255 scope global noprefixroute eth0 valid_lft forever preferred_lft forever inet6 2a01:7c8:aabb:111::1/48 scope global noprefixroute valid_lft forever preferred_lft forever inet6 fe80::5054:ff:fef6:ae54/64 scope link noprefixroute valid_lft forever preferred_lft forever
Step 3
Do you use the fast installs feature for your VPS and have you chosen an installation using SSH-keys, one time password, or config user data? Then, disable the underlying CloudInit and optionally remove the existing configuration:
sudo touch /etc/cloud/cloud-init.disabled
sudo rm /etc/sysconfig/network-scripts/ifcfg-eth0Nowadd the extra IPv4 address in the network interfaces. First, open the network configuration file:
sudo nano /etc/sysconfig/network-scripts/ifcfg-eth0
Add/adjust the following to the existing configuration file:
BOOTPROTO=none IPV4_FAILURE_FATAL=no PROXY_METHOD=none DEFROUTE=yes 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=149.138.222.1
- IPADDR(x) is the IP address that you want to set and GATEWAY(x) the gateway, which for your IP address can be found in the control panel.
- For every IP address that you add, you use an ascending number, i.e. IPADDR, IPADDR1, IPADDR2, etc. The same applies to gateways if applicable. You need to leave the (sub)NETMASK at 255.255.255.0.
- You are not required to add a gateway if the IP is part of the same /24 range. If it isn’t, you are required to set the gaeway.
Save the changes and exit nano (ctrl + x > y > enter).
Step 4
Reset your network interfaces with the following command to use the new IP address:
ifdown eth0 && ifup eth0Step 5
If you run ip a again you will see the newly added IPv4 address. You can test this IP address by performing a ping test from another computer / IP.
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000 link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 inet 127.0.0.1/8 scope host lo valid_lft forever preferred_lft forever inet6 ::1/128 scope host valid_lft forever preferred_lft forever 2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000 link/ether 52:54:00:f6:ae:54 brd ff:ff:ff:ff:ff:ff inet 149.210.111.222/24 brd 149.210.111.255 scope global noprefixroute eth0 valid_lft forever preferred_lft forever inet 149.210.222.111/24 brd 149.210.222.255 scope global noprefixroute eth0 valid_lft forever preferred_lft forever inet6 2a01:7c8:aabb:111::1/48 scope global noprefixroute valid_lft forever preferred_lft forever inet6 fe80::5054:ff:fef6:ae54/64 scope link noprefixroute valid_lft forever preferred_lft forever
Repeat the above steps if you want to add more IP addresses.
Adding an IPv6 address in CentOS 8
Step 1
Connect to the VPS via the VPS console or via SSH.
Step 2
Once logged in you see the current network interfaces and the configured IPs by using the command:
ip aFor the next steps, it is especially important that you are aware of the correct adapter name. Which is ens3 in this example.
Step 3
Do you use the fast installs feature for your VPS and have you chosen an installation using SSH-keys, one time password, or config user data? Then, disable the underlying CloudInit and optionally remove the existing configuration:
sudo touch /etc/cloud/cloud-init.disabled
sudo rm /etc/sysconfig/network-scripts/ifcfg-eth0Nowadd the extra IPv6 address in the network interfaces. First, open the network configuration file:
sudo nano /etc/sysconfig/network-scripts/ifcfg-eth0
In the opened configuration file, add the following lines if they are missing (replacing the IPv6 address by your server’s primary IPv6 address):
IPV6INIT=yes IPV6_AUTOCONF=no IPV6_DEFROUTE=yes IPV6_FAILURE_FATAL=no IPV6ADDR=2a01:7c8:aabb:111::1 IPV6_DEFAULTGW=2a01:7c8:aabb:1
Save the changes and exit nano (ctrl + x > y > enter). If you want to add more IPv6 addresses, add the following line (placing all additional addresses between the brackets):
IPV6ADDR_SECONDARIES="2a01:7c8:aabb:111::2 2a01:7c8:aabb:111::3"
Step 4
Process the changes using the following command:
ifdown eth0 && ifup eth0Step 5
If you run ip a again you will see the newly added IPv6 address. You can test this IP address by performing a ping test from another computer / IP.
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
link/ether 52:54:00:f6:ae:54 brd ff:ff:ff:ff:ff:ff
inet 149.210.111.222/24 brd 149.210.111.255 scope global noprefixroute eth0
valid_lft forever preferred_lft forever
inet6 2a01:7c8:aabb:111::1/48 scope global noprefixroute
valid_lft forever preferred_lft forever
inet6 2a01:7c8:aabb:111::2/48 scope global noprefixroute
valid_lft forever preferred_lft forever
inet6 fe80::5054:ff:fef6:ae54/64 scope link noprefixroute
valid_lft forever preferred_lft forever
Repeat the above steps if you want to add more IP addresses.
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