user manual

Wireless Cable Modem Gateway CGD24G User Manual
5-12 Customizing Your Network
v1.1, May 2009
3. Enter the following information:
• Advertisement Period. Enter how often the gateway broadcasts its UPnP information.
The default is 30 minutes.Shorter durations will ensure that control points have current
device status at the expense of additional network traffic. Longer durations may
compromise the freshness of the device status but can significantly reduce network traffic.
• Advertisement Time to Live. Enter the time to live for the advertisement, which is
measured in hops (steps) for each UPnP packet that is sent. A hop is the number of steps
that are 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 should be fine for most home networks. If you notice that some
devices are not being updated or reached correctly, you might need to increase this value
slightly.
The UPnP Portmap Table displays the IP address of each UPnP device that is currently
accessing the router and which internal and external ports of the gateway were opened by that
device. The UPnP Portmap Table also displays the protocol for the port that was opened and if
that port is still active for each IP address.
4. Perform one of the following actions:
• Click Apply to save your settings.
• Click Cancel to disregard any unsaved changes.
• Click Refresh to update the UPnP Portmap Table and to show the active ports that are
currently opened by UPnP devices.