Draytek Vigor3910 Series User Manual page 60

WAN Connection
Detection
After finished the above settings, click OK to save the settings.
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Such function allows you to verify whether network
connection is alive or not through Ping Detect.
Mode – Choose Always On or Ping Detect for the system to
execute for WAN detection.

Ping IP/Hostname – If you choose Ping Detect as
detection mode, you have to type IP address in this field
for pinging.

TTL (Time to Live) –If you choose Ping Detect as
detection mode, you have to type TTL value.
Vigor3910 Series User's Guide