Netgear SRX5308 SRX5308 Reference Manual - Page 178

ProSafe Gigabit Quad WAN SSL VPN Firewall SRX5308 Reference Manual Table 5-12. Add VPN Policy Settings (continued) Item Description (or Subfield and Description) Auto Policy Parameters Note: These fields apply only when you select Auto Policy as the policy type. SA Lifetime Encryption Algorithm Integrity Algorithm PFS Key Group Select IKE Policy The lifetime of the security association (SA) is the period or the amount of transmitted data after which the SA becomes invalid and must be renegotiated. From the drop-down list, select how the SA lifetime is specified: • Seconds. In the SA Lifetime field, enter a period in seconds. The minimum value is 300 seconds. The default value is 3600 seconds. • KBytes. In the SA Lifetime field, enter a number of kilobytes. The minimum value is 1920000 KB. From the drop-down list, select one of the following five algorithms to negotiate the security association (SA): • DES. Data Encryption Standard (DES). • 3DES. Triple DES. This is the default algorithm. • AES-128. Advanced Encryption Standard (AES) with a 128-bits key size. • AES-192. AES with a 192-bits key size. • AES-256. AES with a 256-bits key size. From the drop-down list, select one of the following two algorithms to be used in the VPN header for the authentication process: • SHA-1. Hash algorithm that produces a 160-bit digest. This is the default setting. • MD5. Hash algorithm that produces a 128-bit digest. Select this check box to enable Perfect Forward Secrecy (PFS), and then select a Diffie-Hellman (DH) group from the drop-down list. The DH Group sets the strength of the algorithm in bits. The higher the group, the more secure the exchange. From the drop-down list, select one of the following three strengths: • Group 1 (768 bit). • Group 2 (1024 bit). This is the default setting. • Group 5 (1536 bit). Select an existing IKE policy that defines the characteristics of the Phase-1 negotiation. Click the View Selected button to display the selected IKE policy. 5. Click Apply to save your settings. The VPN policy is added to the List of VPN Policies table. 5-36 Virtual Private Networking Using IPsec Connections v1.0, April 2010