Draytek Vigor2860 User Manual page 128

After finished the above settings, click OK to save the settings.
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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.
Vigor2860 Series User's Guide