Draytek Vigor 2110 User Manual page 217

Available settings are explained as follows:
Item
Allowed Dial-In
Type
Vigor2110 Series User's Guide
find a match. Three combinations are available for both
modes. We suggest you select the combination that
covers the most algorithms.
IKE phase 1 key lifetime-For security reason, the
lifetime of key should be defined. The default value is
28800 seconds. You may specify a value in between
900 and 86400 seconds.
IKE phase 2 key lifetime-For security reason, the
lifetime of key should be defined. The default value is
3600 seconds. You may specify a value in between
600 and 86400 seconds.
Perfect Forward Secret (PFS)-The IKE Phase 1 key
will be reused to avoid the computation complexity in
phase 2. The default value is inactive this function.
Local ID-In Aggressive mode, Local ID is on behalf of
the IP address while identity authenticating with remote
VPN server. The length of the ID is limited to 47
characters.
Description
Determine the dial-in connection with different types.
PPTP - Allow the remote dial-in user to make a PPTP VPN
connection through the Internet. You should set the User Name
209