OS X Mountain Lion: Trace the paths of your network traffic
Messages you send across the Internet usually pass through other computers on the way to their final destination.
You can use Network Utility to follow the path a message takes as it travels through the network from computer to computer.
- Open Network Utility, located in the Utilities folder in the Applications folder.
- Click Traceroute.
- Type the domain name or IP address of the final destination and click the Trace button.
For help interpreting the results or to see how you can use the underlying traceroute command to fine-tune your troubleshooting, open Terminal (in the Utilities folder in the Applications folder) and type: