ZyXEL ISG50-PSTN User Guide - Page 374
Configuration > VPN > IPSec VPN > VPN Connection > Edit continued
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Chapter 24 IPSec VPN Table 123 Configuration > VPN > IPSec VPN > VPN Connection > Edit (continued) LABEL Policy Enforcement DESCRIPTION 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. Phase 2 Settings SA Life Time Active Protocol Selecting this restricts who can use the VPN tunnel. The ISG50 drops traffic with source and destination IP addresses that do not match the local and remote policy. Type the maximum number of seconds the IPSec SA can last. Shorter life times provide better security. The ISG50 automatically negotiates a new IPSec SA before the current one expires, if there are users who are accessing remote resources. 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 ISG50 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 # Encryption The ISG50 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. This field is applicable when the Active Protocol is ESP. Select which key size and encryption algorithm to use in the IPSec SA. Choices are: NULL - no encryption key or algorithm DES - a 56-bit key with the DES encryption algorithm 3DES - a 168-bit key with the DES encryption algorithm AES128 - a 128-bit key with the AES encryption algorithm AES192 - a 192-bit key with the AES encryption algorithm AES256 - a 256-bit key with the AES encryption algorithm The ISG50 and the remote IPSec router must both have at least one proposal that uses use the same encryption and the same key. Longer keys are more secure, but require more processing power, resulting in increased latency and decreased throughput. 374 ISG50 User's Guide