IKEv2

IKEv2
http://technet.microsoft.com/en-us/library/ff687723(v=ws.10).aspx

IKEv2 allows multiprotocol traffic to be encrypted and then encapsulated in an IPsec header to be sent across a private IP network or a public IP network, such as the Internet. IKEv2 can be used for remote access VPN connections. IKEv2 supports automatic VPN reconnect that allows the security association to survive changes in the underlying connection. This enables a VPN connection to continue working with no user interaction when the network connection changes from wired to wireless, or if the IP address changes. When using the Internet as the public network for VPN, the IKEv2 server is an IKEv2-enabled VPN server with one interface on the Internet and a second interface on the intranet.

Both IKEv2 and IPsec must be supported by both the VPN client and the VPN server. IKEv2 is supported by remote access clients running Windows 7, and by VPN servers running Windows Server 2008 R2.

ummm..... w-xp not supported?