How to Setup IPv6 address on a Dedicated Server?

HostSailor

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We are providing /48 IPv6 subnets with dedicated servers. Here we have described how to set up an IPv6 address on a Linux server.
Centos Server
  1. Make sure that IPv6 is not disabled in the server configuration. So you need to check the sysctl file and add the entries below:

    # vi /etc/sysctl.conf

    net.ipv6.conf.default.disable_ipv6 = 0
    net.ipv6.conf.all.disable_ipv6 = 0
  2. Then we need to enable the IPv6 in the network file as well:

    # vi /etc/sysconfig/network

    NETWORKING_IPV6=yes
  3. Add the entries in the active ethernet file, here I am doing it on eth0:

    # vi /etc/sysconfig/network-scripts/ifcfg-eth0

    Append the following lines in that file, make sure that IPv4 entries are not getting removed:
    IPV6INIT=yes
    IPV6ADDR=IPv6 IP-Address
    IPV6_DEFAULTGW=IPv6 Gateway Address
  4. Restart the network service:

    # /etc/init.d/network/restart

    Debian/Ubuntu Server

    1. Access the Network interfaces file and add the following entries:

    # sudo nano /etc/network/interfaces
    auto eth0
    iface eth0 inet6 static
    address <IPv6 IP-Address>
    netmask 48
    gateway <IPv6 Gateway Address>
    2. Restart the networking service:

    # sudo /etc/init.d/networking restart
    or
    # sudo systemctl restart networking
 

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