Extra ip address configuration

For extra IPs to work, you must configure them inside the operating system of the server you use.

To temporarily configure an IPv4 “1.2.3.4”, you can run:

ip addr add 1.2.3.4/32 dev eth0

Please note that this configuration will not survive a reboot.

To configure the first IPv6 address of an IPv6 netblock 2a01:4f8:2c17:2c::/64, you should run:

ip addr add 2a01:4f8:2c17:2c::1/128 dev eth0

How do i permanently configure an extra IP?

 touch /etc/network/interfaces.d/60-my-extra-ip.cfg
 nano /etc/network/interfaces.d/60-my-extra-ip.cfg

Paste the following configuration into the editor and replace your.Extra.IP with your extra IP:

IPv4:

 auto eth0:1
 iface eth0:1 inet static
     address your.Extra.IP
     netmask 32

IPv6:

 auto eth0:1
 iface eth0:1 inet6 static
     address one IPv6 address of the subnet, e.g. 2a01:4f9:0:2a1::2
     netmask 64

Now you should restart your network. Caution: This will reset your network connection:

 sudo service networking restart

 touch /etc/netplan/60-extra-ip.yaml
 nano /etc/netplan/60-extra-ip.yaml

Paste the following configuration into the editor and replace your.Extra.IP with your extra IP:

IPv4:

network:
   version: 2
   renderer: networkd
   ethernets:
     eth0:
       addresses:
       - your.extra.ip/32

IPv6:

network:
   version: 2
   renderer: networkd
   ethernets:
     eth0:
       addresses:
       - your.extra.ip/64

Now you should restart your network. Caution: This will reset your network connection:

 sudo netplan apply

 touch /etc/sysconfig/network-scripts/ifcfg-eth0:1
 vi /etc/sysconfig/network-scripts/ifcfg-eth0:1

Paste the following configuration into the editor and replace your.Extra.IP with your extra IP:

IPv4:

 BOOTPROTO=static
 DEVICE=eth0:1
 IPADDR=your.Extra.IP
 PREFIX=32
 TYPE=Ethernet
 USERCTL=no
 ONBOOT=yes

IPv6:

 BOOTPROTO=none
 DEVICE=eth0:1
 ONBOOT=yes
 IPV6ADDR=one IPv6 address of the subnet, e.g. 2a01:4f9:0:2a1::2/64
 IPV6INIT=yes

Now you should restart your network. Caution: This will reset your network connection:

 systemctl restart network