vpn connection on a server

Hello and thank you for looking. This is what we need. 1, A vpn server setting up on a linux server that will allow 100+ users to connet to it to use a pool of our ip addresses 2.A easy to use web based control panel that we use to add or remove clients [login to view URL] is a must that only one client can use each account at any given time. but can select up to 5 4.A easy to install (by Client) Windows VPN Dialer that supports the vpn network. It must work on Windows 2000, Windows XP SP1, SP2, SP3, Windows Vista SP1 if there are more service packs on Windows Vista it must be compatible with them. This Dialer must have this options included a logo can be inetegrated, because this Dialer will be used by 3rd party companies that will rebrand the Dialer when they become our resellers. 5. automatic account setup intergrated with paypal and our website 6. someone that can add more servers every week Once again thank you for looking any questions please pm us.