PPTP VPN setup

I have a PPTP VPN tunnel set between two NT4 SP6a machines. There is SERVER1 a dual-homed RAS server (it is also a printer server) on Network1. There is SERVER2 a dial-up PPTP client on NETWORK2.

1. My VPN tunnel connections always time out in15 minutes of innactivity but I need it to stay alive all the time regardless on activities on the line.

2. SERVER2 can print to all printers on SERVER1 but all other machines on NETWORK2 do not see the printers defined on SERVER2. Even though Ican ping and tracert SERVER1 from all machines on NETWORK2.

3.How can I direct the network traffic from NETWORK2 to SERVER1 into the PPTP tunnel on SERVER2?