In this advanced article, learn how to capture a packet trace; for example, you may be asked to do this when troubleshooting a network connectivity issue.  These steps use Terminal and the the tcpdump command; if you are not familiar with using the Terminal, you may want to use for third-party software that can perform a packet trace instead.

Continued here:
Mac OS X v10.5, 10.6: How to capture a packet trace

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