Draytek Vigor2860 User Manual page 108

WAN Connection
Detection
MTU
TTL
94
characters.
Index (1-15) in Schedule Setup - You can type in four sets of
time schedule for your request. All the schedules can be set
previously in Application >> Schedule web page and you can
use the number that you have set in that web page.
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.
Change the TTL value – Enable or disable the TTL (Time to
Live) for a packet transmitted through Vigor router.
Enable - TTL value will be reduced (-1) when it passess
through Vigor router. It will cause the client, accessing
Vigor2860 Series User's Guide