vpn connection shareing with xp in work group envorinment.

hi.
we r working in a work group envoirment, we had some 2000 servers for sap/r3.and all other r win xp.we had connented one vpn connention on one system i.e win2000.but we need 10 more system to connect to vpn.how can we share the vpn connention with other win xp systems.we want all users should connect from there systems also,

i am geting error 721.server not responding.

we had 1 lease line through which we all r connecting to internet.at a time we r able to connect only one vpn connecting.but we need 10 at once.

pls help me on this issue,
thank u in advanse.