I'm not sure what I'm after is available, but I'll ask anyway.
I need a NAT filtering driver for Windows NT (NT, 2000, XP, 2003) that will allow me to redirect traffic in a rule-based scenario.
I have already found Pseud IP Masquerade (http://www.hh.iij4u.or.jp/~yukon/soft/pipmasq/
), however it appears that it is massively out of date and wont do exactly what I need.
If more points are needed, please say so.