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Virtual Private Networking Using IPSec, PPTP, or L2TP Connections
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ProSecure Unified Threat Management (UTM) Appliance
4. Click Apply to save your settings. The VPN policy is added to the List of VPN Policies table.
Auto Policy Parameters
Note: These fields apply only when you select Auto Policy as the policy type.
SA Lifetime The lifetime of the security association (SA) is the period or the amount of
transmitted data after which the SA becomes invalid and needs to 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.
Encryption Algorithm 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-bit key size.
• AES-192. AES with a 192-bit key size.
• AES-256. AES with a 256-bit key size.
Integrity Algorithm From the drop-down list, select one of the following 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.
• AES-256. Hash algorithm that produces a 256-bit digest.
• AES-512. Hash algorithm that produces a 512-bit digest.
PFS Key Group 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 strengths:
• Group 1 (768 bit).
• Group 2 (1024 bit). This is the default setting.
• Group 5 (1536 bit).
• Group 14 (2048 bit).
• Group 15 (3072 bit).
• Group 16 (4096 bit).
Select IKE Policy Select an existing IKE policy that defines the characteristics of the Phase-1
negotiation. To display the selected IKE policy, click the View Selected button.
Table 74. Add New VPN Policy screen settings (continued)
Setting Description