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Configuring IPv6 on your VPS

28 Aug 2018 0 7  0

Each of these examples assumes an IPv6 subnet of ‘2001:db8:1000::/64’. You will need to update them with the subnet that you have been assigned.

We will be using ‘2001:db8:1000::100’ as the main IPv6 address to assign. We will also be configuring ‘2001:db8:1000::200’ as a secondary IPv6 address. Adding a secondary IPv6 is not necessary, however, it shows the process you would use if you wanted multiple IPv6 addresses.

Important Note: If you add an IPv6 subnet to an existing machine, you must restart the server via the ‘DreamVPS’ control panel before IPv6 will work. Restarting via SSH or similar is not sufficient. IPv6 would not work at all until the server has been restarted. This does not apply if you have selected IPv6 during the initial server deployment.

In the ‘DreamVPS’ control panel, there are configuration examples generated for each of your VMs. These are located under the VM’s IPv6 settings, labeled ‘See configuration examples or documentation.’.

CentOS 6, CentOS 7

Add the following lines to the ‘/etc/sysconfig/network-scripts/ifcfg-eth0’ file.

IPV6INIT="yes"

IPV6ADDR="2001:db8:1000::100/64"

IPV6_AUTOCONF="yes"

IPV6ADDR_SECONDARIES=“2001:db8:1000::200/64"

 

 

Restart networking or reboot.

service network restart

 

If you have IP forwarding enabled (using your server as a VPN or similar), you will also need to add the following lines to the ‘/etc/sysctl.conf’ file. The default settings for these variables (which is 1), prevents IPv6 from working properly when IP forwarding is enabled. You can check if IP forwarding is enabled by running ‘sysctl net.ipv4.ip_forward’.

net.ipv6.conf.all.accept_ra=2

net.ipv6.conf.eth0.accept_ra=2

 

 

Debian 8

Dynamic configuration

For dynamic configuration, add the following lines to the ‘/etc/network/interfaces’ file.

iface eth0 inet6 auto

 

Restart networking or reboot.

systemctl restart networking.service

 

Static configuration

For static configuration, add the following lines to the ‘/etc/network/interfaces’ file.

iface eth0 inet6 static

address 2001:db8:1000::100

netmask 64

up /sbin/ip -6 addr add dev eth0 2001:db8:1000::200

 

 

Restart networking or reboot.

systemctl restart networking.service

 

Debian 9

Dynamic configuration

For dynamic configuration, add the following lines to the ‘/etc/network/interfaces’ file.

iface ens3 inet6 auto

 

Restart networking or reboot.

systemctl restart networking.service

 

Static configuration

For static configuration, add the following lines to the ‘/etc/network/interfaces’ file.

iface ens3 inet6 static

address 2001:db8:1000::100

netmask 64

up /sbin/ip -6 addr add dev ens3 2001:db8:1000::200




Restart networking or reboot.

systemctl restart networking.service

 

Fedora 26 – Fedora 28

Add the following lines to the ‘/etc/sysconfig/network-scripts/ifcfg-ens3’ file.

IPV6INIT="yes"

IPV6ADDR="2001:db8:1000::100/64"

IPV6_AUTOCONF="yes"

IPV6ADDR_SECONDARIES=“2001:db8:1000::200/64"

 

 

Restart networking or reboot.

systemctl restart network.service

 

FreeBSD 10.x, FreeBSD 11.x

Dynamic configuration

For dynamic configuration, add the following lines to the ‘/etc/rc.conf’ file.

ifconfig_vtnet0_ipv6="inet6 accept_rtadv"

ipv6_activate_all_interfaces="YES"

rtsold_enable="YES"

rtsold_flags=“-aF"

 

Start the router solicitation daemon or reboot.

service rtsold start

 

Static configuration

For static configuration, add the following lines to the ‘/etc/rc.conf’ file.

rtsold_enable="YES"

ipv6_activate_all_interfaces="YES"

rtsold_flags="-aF"

ifconfig_vtnet0_ipv6="inet6 2001:db8:1000::100 prefixlen 64"

ifconfig_vtnet0_alias0="inet6 2001:db8:1000::200 prefixlen 64”

 

Start the router solicitation daemon or reboot.

service rtsold start

 

OpenBSD 6.0 – OpenBSD 6.2

Add the following lines to the ‘/etc/hostname.vio0’ file.

inet6 autoconf -autoconfprivacy

inet6 alias 20012001:db8:1000::200 64

 

 

Restart the interface or reboot.

sh /etc/netstart vio0

 

OpenBSD 6.3

Add the following lines to the ‘/etc/hostname.vio0’ file.

inet6 autoconf -autoconfprivacy -soii

inet6 alias 20012001:db8:1000::200 64

 

Restart the interface or reboot.

sh /etc/netstart vio0

 

Ubuntu 14.04

Dynamic configuration

For dynamic configuration, add the following lines to the /etc/network/interfaces file.

iface eth0 inet6 auto

Reboot the instance.

 

Static configuration

For static configuration, add the following lines to the ‘/etc/network/interfaces’ file.

iface eth0 inet6 static

address 2001:db8:1000::100

netmask 64

up /sbin/ip -6 addr add dev eth0 2001:db8:1000::200

 

IP forwarding

If you have IP forwarding enabled (using your server as a VPN or similar), you will also need to add the following lines to the ‘/etc/sysctl.conf’ file. The default settings for these variables (which is 1), prevents IPv6 from working properly when IP forwarding is enabled. You can check if IP forwarding is enabled by running ‘sysctl net.ipv4.ip_forward’.

net.ipv6.conf.all.accept_ra=2

net.ipv6.conf.eth0.accept_ra=2


Ubuntu 16.04

Dynamic configuration

For dynamic configuration, add the following lines to the ‘/etc/network/interfaces’ file.

iface ens3 inet6 auto

 

Restart networking or reboot.

systemctl restart networking.service

 

Static configuration

For static configuration, add the following lines to the ‘/etc/network/interfaces’ file.

iface ens3 inet6 static

address 2001:db8:1000::100

netmask 64

up /sbin/ip -6 addr add dev ens3 2001:db8:1000::200

 

 

Restart networking or reboot.

systemctl restart networking.service

 

Ubuntu 18.04

Populate the ‘/etc/netplan/10-ens3.yaml’ file with the following text.

network:

version: 2

renderer: networkd

ethernets:

ens3:

dhcp4: yes

addresses:

‘2001:db8:1000::200/64'

 

Update networking or reboot.

netplan apply

 

Windows Server 2012 R2, Windows Server 2016

Find the public interface name on your system. You can use ‘ipconfig /all’ or navigate through the Windows Control Panel.

Replace ‘Ethernet’ with the public interface name that Windows has chosen and run the following commands.

netsh interface ipv6 set global randomizeidentifiers=disabled

netsh interface ipv6 add address interface="Ethernet" address="2001:db8:1000::100/64"

netsh interface ipv6 add address interface="Ethernet" address="2001:db8:1000::200/64"

 

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