The L2TP feature is recommended over PPTP access being that it is more secure. Simply enable the L2TP server as well as the IPsec server. Create a user on the L2TP page, and configure the L2TP settings. It is recommended to configure with the highest options for both Encryption and Hash algorithms. MAC's have a built in client that needs no configuration changes. If you are using a Windows computer there is a registry change that will need to be applied prior to connecting.