VPN connection

Our client has asked us to VPN to their system. They have a cisco VPN 3000 concentrator. We use the Cisco VPN 3000 client. We run NT 4.0 network with our desktops running win95/98. There is no problem connecting to our client network but once we areconnected, we loose the connection on our end. We can’t see our printers nor any desktops and servers. We seem to be totally connected to the client’s network and loose connection totally with our network.