[CentOS] regarding vpn server for 1500 clients

> Just out of my own curriosity have you gave the thought of using
> deadicated
> or virtual circuits for the VPN implimentation? Like Frame Relay or ATM?
> Are
> you passing off the connections to a secondairy network access server? Or
> how do you plan on rolling this out, configuration wise?
>
user will connect vpn using isp leased line.
vpn server in dmz.
application server is in inside network.
no planing for atm / frame relay.