Draytek Vigor2860 User Manual page 111

MTU
RIP Protocol
Bridge Mode
TTL
Vigor2860 Series User's Guide
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.
Routing Information Protocol is abbreviated as RIP （RFC1058）
specifying how routers exchange routing tables information.
Click Enable RIP for activating this function.
Enable Bridge Mode - If the function is enabled, the router
will work as a bridge modem.
Enable Firewall – It is available when Bridge Mode is
enabled. When both Bridge Mode and Firewall check boxes
are enabled, the settings configured (user profiles) under
User Management will be ignored. And all of the filter rules
defined and enabled in Firewall menu will be activated.
Bridge Subnet – Make a bridge between the selected LAN
subnet and such WAN interface.
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
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