Advanced IKE Settings

Table 5-12IKEv1/IKEv2 Phase 2 / Quick Mode Settings (IPsec Protocols) page

Item	Description

Encapsulation Type	Specify how the selected IPsec protocols (ESP or AH) are encapsulated:
	●	Transport (default) Protect only the user data in each IP packet. Do not protect
		the IP packet header.
	●	Tunnel Protect all packet fields, including the header.

Cryptographic Parameters	Set the encryption methods and strengths, and the authentication methods used:
	●	ESP IPsec encapsulating security payload (ESP) protocol for IP packets. ESP
		headers are inserted in packets to ensure privacy and integrity of packet
		contents. Select among the supported encryption methods and strengths and
		the authentication methods to use for data protection.
	●	AH IPsec authentication header (AH) protocol for IP packets. AH headers are
		inserted in packets to protect integrity of packet contents through cryptographic
		checksums. Select among the supported authentication methods.
		CAUTION: IPsec AH might not function properly in environments that use
		network address translation (NAT).
	NOTE: You cannot use ESP authentication if AH is enabled. If you enable ESP and
	AH, you must select AH authentication methods.

Security Association	SA Lifetime Security association lifetime in seconds (30 to 28800), the number of
	kilobytes (10 to 4294967295 Kb), or both. Within the limits specified, shorter lifetimes
	provide improved security depending on the frequency of SA use.
	Set to zero (0) to disable.

Advanced IKE Settings	Click to configure advanced IKE settings.

The Advanced IKE Settings page contains the configuration settings described in the following table.

Item	Description

Replay Detection	Set the IPsec anti-replay algorithm. IPsec protocols support anti-replay services to
	prevent message interception for later use, such as attempting to gain access to
	resources.

Key Perfect Forward Secrecy	Set session perfect forward secrecy (PFS) for key protection. When secret keys are
(Session PFS)	periodically replaced, PFS indicates that the new keys are independently derived and
	unrelated to the prior keys. This can ensure that data protected by the new keys is
	secure. While PFS provides additional security, it requires additional processing
	overhead.

Sequence Number	Set the sequence number at 32 bit, 64 bit, or both 32 and 64 bit.

Diffie-Hellman Groups	Diffie-Hellman Groups (For Session PFS only) Multiple well-known Diffie-Hellman
	groups that can be used are listed. To change the entries in the list, click Edit.

Items on the IPsec Protocols page are described in the following table.

118 Chapter 5 IPsec/Firewall configuration (V.45.xx.nn.xx)