Draytek vigor3900 User Manual page 287

Security Protocol
DPD Delay
DPD Timeout
4. Fill in the required information on this page and click Finish. A pop-up window will
appear.
5. Click OK. Then, return to VPN and Remote Access>>VPN Server Wizard. The new
added VPN server profile will be displayed on the screen.
Vigor3900 Series User's Guide
Choose ESP to specify the IPSec protocol for the
Encapsulating Security Payload protocol. The data will be
encrypted and authenticated. Choose AH to specify the
IPSec protocol for the Authentication Header protocol. The
data will be authenticated but not be encrypted.
DPD means dead peer detection. It is a keep-alive timer. A
Hello message will be emitted periodically when a tunnel is
idle. Use the value 0 to disable this function. The
recommended value is 30 seconds if enabled.
It is the timeout timer. The peer will be declared dead once
no acknowledge message is received after timeout value.
Use the value 0 to disable this function. The recommended
value is 120 seconds if enabled.
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