Planet Technology VRT-401G - Manual (Page 71)

Diffie Hellman You can choose which Diffie Hellman protocol you want
to use at the Phase 1.
Key Life Time
Enter the life time for the key. After this time, the key will
expire.
PFS
If you turn on this option, the keys that protect data
transmission are not used to derive additional keys. Also,
seeds used to create data transmission keys are not
reused.
Click <OK> at the bottom of the screen to save the above configurations.
2.8.2 L2TP Server
Layer Two Tunneling Protocol (L2TP) is an extension of the Point-to-Point Tunneling Protocol
(PPTP). By enable this server, we can enable the operation of a virtual private network (VPN)
over the Internet.
71