Motorola WiNG 5 System Reference Manual page 170

5 - 110 WiNG 5 Access Point System Reference Guide
Figure 5-58 Profile Security - Global VPN Settings screen
37. Define the following settings IKE Dead Peer Detection:
DPD Keep Alive Define the interval (or frequency) of IKE keep alive messages for dead peer
detection. Options include Seconds (10 - 3,600), Minutes (1 - 60) and Hours
(1). The default setting is 30 seconds.