Draytek VIGOR2925 SERIES User Manual page 197

MTU
RIP Protocol
Bridge Mode
WAN IP Network
Settings
TTL (Time to Live) – Set TTL value of PING operation.
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.
This group allows you to obtain an IP address automatically
and allows you type in IP address manually.
WAN IP Alias - If you have multiple public IP addresses
and would like to utilize them on the WAN interface, please
use WAN IP Alias. You can set up to 32 public IP
addresses other than the current one you are using.
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Vigor2925 Series User's Guide