Microsoft Windows [Version 6.1.7000] (C) Copyright 2009 Microsoft Corp. C:\Windows>netsh interface portproxy add v6tov6 ?
Usage: add v6tov6 [listenport=]|[connectaddress=]|[[connectport=]|][[listenaddress=]|][[protocol=]tcp]
listenport - IPv6 port on which to listen.
connectaddress - IPv6 address to which to connect.
connectport - IPv6 port to which to connect.
listenaddress - IPv6 address on which to listen.
protocol - Protocol to use. Currently only TCP is supported.
Remarks: Adds an entry to listen on for IPv6 and proxy connect to via IPv6.