Netopia 3346N-ENT User Guide (en)

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6-14  Firmware User Guide
This screen allows you to specify the lifetime associated with each IPsec Security Association (SA) and control 
when the SA will expire and become invalid.
SA Lifetime (seconds) specifies the duration in seconds for which the SA will remain valid. The range of 
permissible values is the set of non-negative integer values between 0 and 2^32-1. The default value is 
28,800 seconds (1 hour). The value zero specifies the absence of an elapsed time lifetime.
SA Lifetime (Kilobytes) specifies the maximum number of kilobytes of data that may be secured 
(encr ypted/decr ypted or authenticated) using the SA before it expires and becomes invalid. The range of 
permissible values is the set of non-negative integer values between 0 and 2^32-1. The default value is 0 
Kilobytes. The value zero specifies the absence of a secured data lifetime. 
Note:
It is invalid to set both lifetime values to zero! This condition is not enforced by the console (in order to 
avoid order dependencies when configuring the items), but rather is enforced at runtime and will cause the 
IPsec profile to assume the defaults. In such a case, the SA Lifetime (seconds) will default to 300 seconds.
Perfect Forward Secrecy toggles whether or not Per fect For ward Secrecy will be used. Enabling Per fect 
For ward Secrecy (the default) causes IKE to per form a new Diffie-Hellman exchange with each Phase 2 
re-key. Because the additional Diffie-Hellman exchanges required for Per fect For ward Secrecy introduce 
additional overhead, it may be good to disable Per fect For ward Secrecy when security does not require it.
Dead Peer Detection toggles whether or not the Router will detect a remote peer being offline.
Enhanced Dead Peer Detection
Netopia Firmware Version 8.6.1 adds a new Dead Peer Detection mechanism.
In previous firmware versions, when Dead Peer Detection was enabled, a counter would begin in the router 
when any traffic was sent through the tunnel. Determination of a dead peer could take up to eight minutes.
                             Advanced IPsec Options
         SA Lifetime seconds:               28800
         SA Lifetime Kbytes:                0
         Perfect Forward Secrecy:           Yes
         Dead Peer Detection:               No