Configure an additional IP address

Purchasing an additional IP address assigns it to the server, but it must still be configured in the operating system before it becomes usable.

1. In the Gcore Hosting control panel, open the Virtual private servers or Dedicated servers tab
2. Select the checkbox next to the server
3. View the IP addresses and note the netmask

   Click IP addresses in the toolbar. Note the IP address and its netmask — these are required for the configuration.

   

   
4. Configure the IP address in the OS

   Select the operating system and follow the steps.

   Debian and Ubuntu

   Edit the network interfaces file to add the IP address.

   1. Open /etc/network/interfaces.
   2. Add the configuration.

   For IPv4:

   auto eth0:N
   iface eth0:N inet static
       address X.X.X.X
       netmask 255.255.255.255
   

   For IPv6 (optional):

   iface eth0:N inet6 static
       address 2001:X:X:X::X
   

   Replace N with the sequential index of the additional IP address (starting at 0 for the first), X.X.X.X with the IP address, and 255.255.255.255 with the actual netmask.

   3. Save the file.
   4. Restart networking: run systemctl restart networking.

   After restarting, run ip addr show to verify the new address appears on the interface.

   CentOS

   Create a per-interface configuration file for each additional IP address.

   1. Create the file /etc/sysconfig/network-scripts/ifcfg-eth0:N.
   2. Add the configuration.

   For IPv4:

   DEVICE=eth0:N
   ONBOOT=yes
   BOOTPROTO=static
   IPADDR=X.X.X.X
   NETMASK=255.255.255.255
   

   For IPv6 (optional):

   IPV6ADDR_SECONDARIES="2001:X:X:X::X/64"
   

   Replace N with the sequential index of the additional IP address (starting at 0 for the first), X.X.X.X with the IP address, and 255.255.255.255 with the actual netmask.

   3. Save the file.
   4. Restart networking: run systemctl restart network.

   After restarting, run ip addr show to verify the new address appears on the interface.