I need free network analyzer software for my mac. we are trying to monitor what software may be running which is causing our internet to fail, although the internet is still coming into our modem.what is recommended?

My internet keeps 'tripping' at or around the same period time each day.  We have already replaced our modem from our internet provider and we bought a new airport extreme router. We do not believe these were the cause, although we have now ruled them out as a cause.  Everytime the internet fails, our internet provider company tells us that there is still plenty of signal coming into our house. There is something going on inside we believe, and a technician set up our Network Utility to run a continuous ping test to capture information about when it 'trips' againn.  Yesterday, it happened again, and when he checked the data out, he said he is sure there is something 'running in the background' on my IMac.  He advised me to download a free Network Analyzer so he could further investigate what is was that was causing the problem, so I need a free network analyzer software for my Mac. The issue has been going on for a long time, so it is not the new operating system, Lion. This morning, we changed the radio channel from 'auto' to 'manual' and set a new channel, hoping that might help. We are trying to find out what program may be running (even a tiny one in the background) which is causing our internet to fail, although the internet is still coming into our modem. What is free downloadable product is recommended?

Will Activity Monitor and/or Network Utility, both already in the Utilities folder on your Mac, help in trying to diagnose the problem.
If you are connecting via wifi what encryption are you using? If you're using the Exteme I doubt that you are using WEP, but worth checking as it seems Macs don't like it and work better using WPA.

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