Draytek Vigor2620 LTE Series User Manual page 74

WAN Connection
Detection
MTU
62
Username – Type in the username provided by ISP in this
field.
Password – Type in the password provided by ISP in this field.
More Options –It shows optional settings for configuration.

Service Name - Enter the description of the specific
network service.
Separate Account for ADSL – In default, WAN1 supports
VDSL2/ADSL and uses the same PPPoE account and password
for connection. If required, you can configure another
account and password for ADSL connection by checking this
box. If it is checked, the system will ask you to type another
group of account and password additionally.
Such function allows you to verify whether network
connection is alive or not through PPP Detect or Ping Detect.
Mode – Choose PPP 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 – Enter the interval for the system to
execute the PING operation.

Ping Retry – Enter 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 – Enter the IP address as the specific
transmit path.
MTU size start from - Determine the starting point

value of the packet.
 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.
Vigor2620 Series User's Guide