ZyXEL ZyWALL USG 2000 User Guide - Page 449
Note: Clear this to use the IPSec SA in a VPN concentrator., Configuration > VPN > IPSec VPN &
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Chapter 25 IPSec VPN Table 118 Configuration > VPN > IPSec VPN > VPN Connection > Edit (continued) LABEL DESCRIPTION Policy Local Policy Select the address corresponding to the local network. Use Create new Object if you need to configure a new one. Remote Policy Select the address corresponding to the remote network. Use Create new Object if you need to configure a new one. Policy Enforcement Clear this to allow traffic with source and destination IP addresses that do not match the local and remote policy to use the VPN tunnel. Leave this cleared for free access between the local and remote networks. Note: Clear this to use the IPSec SA in a VPN concentrator. Selecting this restricts who can use the VPN tunnel. The ZyWALL drops traffic with source and destination IP addresses that do not match the local and remote policy. Phase 2 Settings SA Life Time Type the maximum number of seconds the IPSec SA can last. Shorter life times provide better security. The ZyWALL automatically negotiates a new IPSec SA before the current one expires, if there are users who are accessing remote resources. Active Protocol Select which protocol you want to use in the IPSec SA. Choices are: AH (RFC 2402) - provides integrity, authentication, sequence integrity (replay resistance), and non-repudiation but not encryption. If you select AH, you must select an Authentication algorithm. ESP (RFC 2406) - provides encryption and the same services offered by AH, but its authentication is weaker. If you select ESP, you must select an Encryption algorithm and Authentication algorithm. Both AH and ESP increase processing requirements and latency (delay). Encapsulation The ZyWALL and remote IPSec router must use the same active protocol. Select which type of encapsulation the IPSec SA uses. Choices are Tunnel - this mode encrypts the IP header information and the data. Transport - this mode only encrypts the data. Proposal Add Edit Remove # The ZyWALL and remote IPSec router must use the same encapsulation. Click this to create a new entry. Select an entry and click this to be able to modify it. Select an entry and click this to delete it. This field is a sequential value, and it is not associated with a specific proposal. The sequence of proposals should not affect performance significantly. ZyWALL USG 2000 User's Guide 449
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