We have had the VPN up and functioning for some time now and everything is
running well with one exception. As we are moving data to a new server it
has turned out that the servers internal IP address is unreachable from the
VPN client. The symptom is after logging into th eVPN the client
computer(Vista) can ping the internal addresses 192.168.1.16 and
192.168.1.19, but cannot ping 192.168.1.17 or 192.168.1.18. The servers
using these addresses cannot be logged into nor will drive mappings to them
work.

What am I missing? Where do I look to correct this problem?