Draytek Vigor2762 series User Manual page 86

Item
APN Name
WAN Connection
Detection
MTU
76
Description
the router will choose a suitable one according to the actual
wireless signal automatically.
APN means Access Point Name which is provided and
required by some ISPs. Type the name and click Apply.
The maximum length of the name you can set is 47
characters.
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 Detect to open the following dialog.
Path MTU to – Type the IP address as the specific

transmit path.
MTU reduce size by – It determines the decreasing

size of MTU value. For example, the number specified
in this field is "8". The maximum MTU size is "1500".
After clicking the "detect" button, the system will
calculate and get the suitable MTU value such as 1500,
1492, 1484 and etc., automatically.
Detect – Click it to detect a suitable MTU value

 Accept – After clicking it, the detected value will be
displayed in the field of MTU.
Vigor2762 Series User's Guide