Draytek Vigor2862 Series User Manual page 106

DNS Server IP Address
WAN Connection
Detection
MTU
90
Type in the primary IP address for the router. If necessary,
type in secondary IP address for necessity in the future.
Such function allows you to verify whether network
connection is alive or not through ARP Detect or Ping Detect.
Mode – Choose Always on, 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 Detect to open the following dialog.
Vigor2862 Series User's Guide