NETGEAR UTM25-100NAS - Prosecure Utm Appliance 25U No Sub Included Reference Manual page 267

ProSecure Unified Threat Management UTM10 or UTM25 Reference Manual
3. In the IKE SA Parameters section of the screen, locate the DPD fields.
Figure 7-32
4. Select the radio button and complete the fields as explained
Table 7-21. Dead Peer Detection Settings
Item
IKE SA Parameters
Enable Dead Peer
Detection
5. Click Apply to save your settings.
Virtual Private Networking Using IPsec Connections
Description (or Subfield and Description)
Select the Yes radio button to enable DPD. When the UTM25 detects an IKE
connection failure, it deletes the IPsec and IKE SA and forces a
reestablishment of the connection. You must enter the detection period and
the maximum number of times that the UTM attempts to reconnect (see
below).
Detection Period The period in seconds between consecutive
"DPD R-U-THERE" messages, which are sent only when
the IPsec traffic is idle. The default setting is 10 seconds.
Reconnect after The maximum number of times that the UTM attempts to
failure count reconnect after a DPD situation. When the maximum
number of times is exceeded, the IPsec connection is
terminated. The default setting is 3 IKE connection
failures.
v1.0, September 2009
Table 7-21.
7-57