A number of documents are available on the VPN3K and the IPSec support pages. The VPN Concentrator support page is located at Cisco.com > Technical Support > Hardware Support > Security & VPN Devices > VPN 3000 Series Client/Concentrators. The IPsec support page is reachable via Cisco.com > Technical Support > Technology Support > Security & VPN > IPSec. One of the good documents for configuring PPTP is "How to Configure the VPN 3000 Concentrator PPTP with Local Authentication" (http://www.cisco.com/warp/public/471/altigapptp.html).
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