搞定了vista做nat网关
两个网卡，一个是openvpn作为内网，一个是local area connections作为外网
Step0. 以下各步都需要run as administrator
Step1. add dlls from 2k3/xp 我用的是2k3 sp1
ipmontr.dll
ippromon.dll
Step2. registry
HKEY_LOCAL_MACHINESYSTEMCurrentControlSetServicesTcpipParameters
IPEnableRouter = 1
Step3. netsh
add helper ipmontr.dll
add helper ippromon.dll
routing ip nat
add interface name="Local Area Connection" mode=FULL
add interface name="OpenVPN" mode=PRIVATE
interface ipv4
set interface "Local Area Connection" forwarding=enable
set interface "OpenVPN" forwarding=enable
Step4. start service
net start RemoteAccess