Poptop is an open source implementation of a PPTP server. Running under x86 or embedded Motorola ColdFire architectures Poptop provides full interoperability with the Microsoft PPTP VPN client.
very good project
Using it with RHEL5.5. Very simple to set-up. Very efficient too. I wonder why it is not included in RHEL distribution ?
Cost effective and robust VPN solution.