Administrator's Guide

Table 5-12 IKEv1/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.
Advanced IKE Settings
The Advanced IKE Settings page contains the configuration settings described in the following
table.
Table 5-13 Advanced IKE Settings page
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
(Session PFS)
Set session perfect forward secrecy (PFS) for key protection. When secret keys are
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.
IPsec Protocols (Manual Keys)
Items on the IPsec Protocols page are described in the following table.
118 Chapter 5 IPsec/Firewall configuration (V.45.xx.nn.xx) ENWW