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The program gives some flexibility by providing command flags that act as filters to capture specific packets that meet your criteria. The iptrace utility allows you to record tcp/ ip network packets going through your network interfaces. Richard Stevens' TCP/IP Illustrated, Volume 1 are excellent references.) (For those who need more detailed information, Douglas Comer's Interconnecting with TCP/IP, Volume I, 3rd Edition and W. For convenience, I have illustrated the packet structures for each of the three protocols in Figure 1. In this article, I assume that the reader is familiar with IP, TCP, and UDP packet formats. Additionally, I provide a shell program for monitoring some netstat statistics over time. I provide a sample output of the program and a brief interpretation of this output. In this article, I discuss how you can use AIX's iptrace and ipreport to troubleshoot network problems. This utility, combined with ipreport, provides a formatted and readable network-packet trace output. These utilities put an interface into promiscuous mode, thus allowing the capture of frames. Some UNIX systems provide utilities that can function as a poor man's protocol analyzer. Have you ever wanted to troubleshoot network problems and found that the tools at your disposal fell short of giving you the details? Or have you ever wanted to buy that Protocol Analyzer but could not afford to do so? Many systems administrators have encountered these obstacles. TCP/IP Troubleshooting in AIX Using Network Packet Traces V08, i12: TCP/IP Troubleshooting in AIX Using Network Packet Traces