Netgear FVS318N – Prosafe Wireless N VPN Firewall 참조 매뉴얼

For DPD to function, the peer VPN device on the other end of the tunnel also needs to 
support DPD. Keep-alive, though less reliable than DPD, does not require any support from 
the peer device.

The keep-alive feature maintains the IPSec SA by sending periodic ping requests to a host 
across the tunnel and monitoring the replies.

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Select VPN > IPSec VPN > VPN Policies. The VPN Policies screen displays the IPv4 
settings (see 

Specify the IP version for which you want to edit a VPN policy:

IPv4. In the upper right of the screen, the IPv4 radio button is already selected by 
default. Go to 

.

IPv6. Select the IPv6 radio button. The VPN Policies screen for IPv6 displays.

In the List of VPN Policies table, click the Edit table button to the right of the VPN policy that 
you want to edit. The Edit VPN Policy screen displays. (The following figure shows only the 
top part with the General section of the Edit VPN Policy screen for IPv6.)