On Networks N300RM User Manual - Manual (Page 80)

Advanced Settings
80
N300 WiFi ADSL2+ Modem Router (N300RM)
Advertisement Time to Live . The time to live for the advertisement is measured in hops
(steps) for each UPnP packet sent. The time to live hop count is the number of steps a
broadcast packet is allowed to propagate for each UPnP advertisement before it
disappears. The number of hops can range from 1 to 255. The default value for the
advertisement time to live is 4 hops, which is fine for most home networks. If you notice
that some devices are not being updated or reached correctly, then it might be necessary
to increase this value.
UPnP Portmap Table
. The UPnP Portmap Table displays the IP address of each UPnP
device that is currently accessing the modem router and which ports (internal and
external) that device has opened. The UPnP Portmap Table also displays what type of
port is open and whether that port is still active for each IP address.
3.
Click Apply to save your settings.
Change the Device Mode
The modem includes a built-in router. If you want to configure the modem as a “pure bridge”
in Modem mode, first set up the Internet connection and then change the Device Mode
setting to Modem mode. In Modem mode, the device acts as a “pure bridge” or DSL modem.
When the device is in Modem mode, features that are not available are grayed out.
 To change the device mode:
1.
Select Advanced > Device Mode. The following screen displays:
By default, the modem is in Router mode.
2. Select the device mode that you want from the drop-down list.
3. Click Apply so that your changes take effect.