Sure, you can disable default gateway on remote network or manually modify
the routing table. These search results may help,
routing issues on vpnCan't access the internal server when remote client
establishes VPN Can't access the Internet while using VPN Can't access the
remote network after ... www.chicagotech.net/routingissuesonvpn.htm
RoutingNo internet access - Destination net unreachable One router
goes to the corporation email server and another one goes to the Internet
.... www.chicagotech.net/routing.htm