Draytek 5500 Series Perfect Forward Secret PFS- The IKE Phase 1 key will be, For i models only

	authentication schemes and encryption algorithms to the VPN
	peers, and get its feedback to find a match. Two combinations
	are available for Aggressive mode and nine for Main mode.
	We suggest you select the combination that covers the most
	schemes.
	IKE phase 2 proposal-To propose the local available
	algorithms to the VPN peers, and get its feedback to 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.
Callback Function	The callback function provides a callback service as a part of
(for i models only)	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.

VigorPro5500 Series User’s Guide 115