Draytek 2800 Series - Manual (Page 91)

Vigor2800 Series User’s Guide 87
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.
Callback Function
(for I models only) The callback function provides a callback service as a part of
PPP suite only for the ISDN dial-in user. The router owner
will be charged the connection fee by the telecom.
Require Remote to Callback-Enable this to let the router to
require the remote peer to callback for the connection
afterwards.
Provide ISDN Number to Remote-In the case that the
remote peer requires the Vigor router to callback, the local
ISDN number will be provided to the remote peer. Check
here to allow the Vigor router to send the ISDN number to
the remote router. This feature is useful for i model only.
Allowed Dial-In Type Determine the dial-in connection with different types.
ISDN Allow the remote ISDN LAN-to-LAN connection. You
should set the User Name and Password of remote dial-in user
below. This feature is useful for i model only. In addition, you
can further set up Callback function below.