Network Analyzer for Windows Mobile runs network utilities, for example ping and ipconfig, on a Windows Mobile powered Pocket PCs or Smartphones.
Network Analyzer for Windows Mobile facilitates the troubleshooting of network connectivity issues. You can add user-defined tests (DLLs) to the list of tests to be executed. An xml input file defines the list of tests to execute. You can use Network Analyzer to send information about network traffic to a .cap file. You can then view the .cap file with the Network Monitor tool or the Ethereal tool.
I think this is one awesome piece of software developed by Microsoft for the benefit of Windows Mobile users as it will definitely help in tracing various network problems easily. Cambridge Corp offers a similiar Netmon tool called vxSniffer which is sold for 60$!!