IPv4 and IPv6

Theory
Here are some pages on which you can get information about IPv6:

• http://en.wikipedia.org/wiki/IPv6
• http://www.olympus-zone.net/page_1033_en_Blue.html

IPv6 at Xoftmade

For our facilities, we have the following /32 Netz: 2001:41D0::/32

For the routing we use Cisco routers 6k (6509 SUP720 card with the native IPv6 packets to route).

Every customer with a dedicated server at Xoftmade has a fixed IPv4, one or more IpFailover and 18,446,744,073,709,551,616 IPv6 addresses (ie a /64) are attached to the IPv4 server.

So you can with a dedicated server:

• Use multiple SSL certificates
• Several anonymous FTP operations
• Web-hosting service run (IP-based)
• A public VPN set up based on the dedicated server
• Etc. ..

Preparation

• The server must be running with a IPv6 kernel. This kernel is available by netboot Netboot
• Find your own IPv6 address in manager v3 Manager

An IPv6 example
An IPv4:

IPv6 will be the following:

Here are examples from which you can configure IPv6 on your dedicated server:

The following notations are the same:

But you can :: place only once.

An example ifconfig
Once you’ve switched the server to IPv6 kernel, after the reboot ifconfig already has IPv6 info:

This shows that IPv6 works on the network.Route: IPv6 Gateway

The router (default gateway) for each IPv6 is always on IP: v:6:FF:FF:FF:FF:FF

For example:

The IPv6 server: 2001:41D0:1:46e::/64 to 2001:41D0:1:4 + 5x FF.
IPv6 Gateway: 2001:41D0:1:4FF:FF:FF:FF:FF

The IPv6 server: 2001:41d0:1:209::/64 to 2001:41d0:1:2 + 5x FF.
IPv6 Gateway: 2001:41d0:1:2FF:FF:FF:FF:FF

IPv6 Installation

To be used for all Linux distributions in the examples below, the server has IPv6, the IPv6 kernel and it is has the address from the manager. A uname-a indicates that an IPv6 kernel, and the command shows us that ifconfig The Router IPv6 already have a local link.

Redhat, CentOS, Fedora

The dedicated server we are running configure with the IPv4: 213.186.35.9/24, this will lead to the following IPv6: 2001:41d0:1:209::/64.
The following examples are identical for Redhat 7.2, Fedora and CentOS. You can therefore also use it for Xoftmade Release Plesk, (based on CentOS).

We do 2001:41D0:1:209::1/64 and 2001:41D0:1:209::5/64 Add to eth0 :

So IPv6 does not disappear at the next reboot it must be added in the configuration file of the eth0 interface. We will create a copy of the file and then edit it:

Here are the contents of the file after the change. The red options were added:

All of the following IPv6 must be located in the line IPV6ADDR_SECONDARIES
It has the file /etc/sysconfig/network edited this line and add NETWORKING_IPV6=yes

It must be restarted with /etc/init.d/network restart
Note: It is possible that Redhat displays an error: “modprobe: Can not open dependencies file …” You can ignore this, it does not affect the result.

ifconfig ?

You may be able to ping the gateway but can not use your ipv6, in this case add a default route:

For example:

Verification

Ping6 Test

We ping6 to the router:

Traceroute6 Test

Do traceroute6 to IPv6 DNS Servers by Afnic:

It is working.
There are websites that can offer a traceroute6 ping6 or tests online. You can use these function to check with the added IPs.