Windows 7 VPN - problem in turning off "use default gateway on remote network"

[woody]

I wanted to use my local IPv4 default gateway, rather than route via HE, but if I turn off the "use default gateway on remote network" setting in the VPN config, the VPN drops after only a few seconds. Everything works fine when this is set to enabled, but I wanted to avoid all of my IPv4 traffic passing along the VPN, which I wanted to use for only the IPv6 traffic.

Please can someone advise if this is possible?

Thanks! :o)