Moving from ipv4 to ipv6

I am confused as to your objective.

IP is a routing protocol and serves no purpose beyond allowing it to communicate with other devices. As a routing protocol, it really isn't "necessary" on a single collission domain.

IPv6 adds a number of additional features within the routing protocol, but these only have value when the other devices are also running IPv6. Microsoft has a "workaround" that allows IPv6 to be tunneled through an IPv4 packet for IPv6 peer-to-peer communications. See article at -http://tinyurl.com/ywbow
This seems like a lot of extra overhead unless you really have an IPv6 peer-to-peer need, especially considering that all the feature offered by IPv6 will only apply at the two ends.

The short response is that you need a NAT device. You may have a device that supports Universal Plug and Play (UPnP). UPnP is a configuration protocol that many devices support. The Teredo client tries to automatically configure NAT devices that support UPnP but otherwise do not allow Teredo traffic. This process occurs automatically. You do not have to configure any additional settings. However, each NAT device is different and may support UPnP but may also require the user to enable it. To determine whether your device supports UPnP, see the documentation that is included with your NAT device.

In Windows XP SP1, the IPv6 protocol is listed as Microsoft IPv6 Developer Edition in the This connection uses the following items list on the General tab of the ConnectionName Properties dialog box. (To view the General tab, click Start, point to Connect to, click Show All Connections, right-click the network connection, click Properties, and then click the General tab).

Although the name that is listed for the IPv6 protocol suggests that Windows XP SP1 does not support it, Windows XP SP1 does in fact support it in the same way that the Microsoft Windows Server 2003 family supports it. Microsoft did not change the name of the protocol was because of the effect of the change for localized versions of Windows

To install the IPv6 protocol on a Windows XP SP1-based computer, follow these steps:
Click Start, and then click Control Panel.
Click Network and Internet Connections, and then click Network Connections.
Right-click the appropriate network connection, and then click Properties.
Click Install.
In the Select Network Component Type dialog box, click Protocol, and then click Add.
In the Select Network Protocol dialog box, click Microsoft IPv6 Developer Edition, and then click OK.
Click Close.

For more information about Microsoft IPv6 for Windows XP, visit the following Microsoft Web site:
http://tinyurl.com/2gn5m

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