Does the DIR-130 actually work when used as a L2TP Over IPSEC server?  I setup a PPTP server, and can connect with a Win XP client no problem.  So I setup a L2TP Over IPSEC server, and cannot get a Win XP client to connect.  I setup the same PSK on both the Windows client and the IPSEC server.  I also changed the type of VPN from Automatic to L2TP IPSEC VPN, and I get several different errors.  Since I rebooted the router, I've been getting an "Error 678: The remote computer failed to respond."  
Since the Dlink docs just say how to setup a PPTP server, I'm a little confused here.  Since there aren't many settings, I'm guessing that the L2TP IPSEC VPN doesn't work correctly (or reliably?) on the DIR-130.
Tylan