User's Manual

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SMCD3GN2 Wireless Cable Modem Gateway Administrator Manual
Using the Trace Route Tool
The Gateway provides a trace route tool for conducting the trace route with the default
Gateway, across the RF interface, or across the WAN interface. This tool provides a
supplemental role to the ping tool. While the ping tool confirms IP network reachability, you
cannot pinpoint and improve some isolated problems.
Consider the following situations:
y When there are many hops (for example, gateways or routes) between the Gateway and
the destination, and there seems to be a problem somewhere along the path. The
destination system may have a problem, but you need to know where a packet is
actually lost.
y The ping tools do not tell you the reasons for a lost packet.
The trace route tool can inform you where the packet is located and why the route is lost.
Using the trace route tools, you can map the network path in real time from the Gateway to a
local or public host.
To perform trace route activities, use the following procedure under Trace Route on the
Diagnostics menu.
1. Enter the IP address or domain name of a target host in the Trace Route field.
2. In the drop-down list to the right of the IP address or domain name, select whether the
trace route is to be sent to the default Gateway, across the Gateway’s RF interface, or
across the Gateway’s WAN interface.
3. Click the tracert button. The trace route results appear in the Diagnostics – Trace Route
Results screen, as the Gateway sends UDP packets to each device between the Gateway
and the destination (see Figure 79 and Figure 80). It starts with the nearest device and
expands the search by one hop until the destination is reached or the trace route times out.
The results screen may flash as the contents refresh during the trace route operation.
4. To close the screen, click the Back button.