Draytek Vigor2862 Series User Manual page 124

WAN Connection
Detection
MTU
108
please specify an IP address for the system to PING it for
keeping alive. Vigor system will send a packet per second to
the specified IP address. If the system does not receive any
reply from that IP within 10 seconds, Vigor system will reboot
LTE module until successfully set LTE connection.
PING to the IP – Enter an IP address.

Connection Latency Check - Enable the latency time setting
for packet reply. If it is enabled (checked), Vigor system will
wait for the packet reply from the specified IP address.
When the time of waiting packet reply reaches the time
threshold (defined in Latency) and continues for a period of
time (defined in Latency Duration), Vigor system will reboot
LTE module until successfully set LTE connection.
Latency – Set a time threshold for packet reply. Default

value is 800 (unit: micro-second).
Latency Duration – Set a time period. Default value is

60 (unit: second).
Such function allows you to verify whether network
connection is alive or not through ARP Detect or Ping Detect.
Mode – Choose ARP Detect or Ping Detect for the system to
execute for WAN detection. If you choose Ping Detect as the
detection mode, you have to type required settings for the
following items.

Primary/Secondary Ping IP – If you choose Ping Detect as
detection mode, you have to type Primary or Secondary IP
address in this field for pinging.

Ping Gateway IP – If you choose Ping Detect as detection
mode, you also can enable this setting to use current WAN
gateway IP address for pinging.
With the IP address(es) pinging, Vigor router can check if
the WAN connection is on or off.

TTL (Time to Live) – Set TTL value of PING operation.

Ping Interval – Type the interval for the system to
execute the PING operation.

Ping Retry – Type the number of times that the system is
allowed to execute the PING operation before WAN
disconnection is judged.
It means Max Transmit Unit for packet.
Path MTU Discovery – It is used to detect the maximum MTU
size of a packet not to be segmented in specific transmit
path.
Click Choose IP to open the following dialog.
 Path MTU to – Type the IP address as the specific
transmit path.
Vigor2862 Series User's Guide