Clear OS - PPTP VPN Connects but can't access PC's inside LAN

Issue :

Can't access / ping client in same network when connected thru PPTP VPN from public only can ping firewall IP.

Solved :

On the XP machine (works on Vista and 7 also) go to the properties of the VPN connection.

• Click on the Networking tab and double click Internet Protocol Version 4 (TCP/IPv4).


• Click Advanced and uncheck the box for "Use default gateway on remote network." 

This will route all of your local traffic through whatever network you're locally connected to, and any remote traffic through the VPN connection. This also assumes that you're not trying to route your internet traffic through the VPN. If you leave this option set, then you will not be able to access any local network resources without manually specifiying routes to get to them