Billion BiPAC 7800(N)X(L) User Manual page 203

authentication. Default is 60 minutes (3600 seconds). A short time increases security by forcing the
two parties to update the keys. However, every time when the VPN tunnel re- negotiates, access
through the tunnel will be temporarily disconnected.
DPD Setting
DPD Function: Check Enable to enable the function.
Detection Interval: The period cycle for dead peer detection. The interval can be 180~86400
seconds.
Idle Timeout: Auto-disconnect the IPSec connection after trying several consecutive times.
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