VPN's clients can't access any resource from my network

Hi folks, 

I enabled VNP features on Forefront TMG and selected the IP address assignment method my DHCP Server.

The clients can connect but can't access any resourse of my network, ping, etc

The DHCP range is 172.16.16.100~172.16.17.254.

May be some configuration is missing, but I don't know what. 

Thanks,