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A company have a High Speed internet connection (30 MB/s) witch is enough for 10-15 computer. But for a week, there is almost no bandwidth "left" just taking the email take a long time or failed. Getting a website on screen is almost impossible. I check with speedtest.net and now the speed is 3mb/s to 6 mb/s if not zero in the test time.

So the question is how i can monitor the in and out from the modem/router and analize what IP take all the "juice" to take that bummer down in flame (or just find the program that make the internet choke). I have a Mac running 10.6.8 (the latest Snow Leopard release) and would like to better manage the network infrastructure and gain visibility into how and when it becomes overloaded or performs poorly.

SO in short, i need to track wich IP or MAC address make the most request... And BTW, when there is no person at no computer (over the w-e) the line is fully used (as sait by the internet provider (videotron) company) wich is not supposed to happend !

NetUse monitor have been suggested by many, but i am still worry about the feature i need. Here is my problem and tell me how your software or other can help me.

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Is there a way to get the LOG from the router ? and analyse it ? –  menardmam Mar 26 '13 at 18:05
This isn't quite answerable yet since you haven't specified what router you use and what protocols it supports for logging (or SNMP). Yes, your Mac could run software that consumes the data that the router produces, but it's hard to recommend software without knowing some more details. Feel free to edit your question to read clearly what research you've done and what hardware / software needs are. (version of OS X and version of router software). –  bmike Mar 26 '13 at 18:31
It's an AirPort Extreme Base Station link to a Videotron modem (high speed) on cable. Cannot tell more than that –  menardmam Mar 27 '13 at 2:33
OSX version all over the place is 10.6.8 –  menardmam Mar 27 '13 at 2:34
Total rewrite of the question does not lead to more answers :-( –  menardmam Mar 27 '13 at 21:00

3 Answers 3

Put a switch which can have ports configured in "span" mode so you can sniff all the traffic, (an old hub will also do the same job) between the router and the base station.

Plug in your laptop, install wireshark and sniff all the traffic. Then analyse.

The other tool I use is MRTG, but you will need to set up SNMP on the Airport or the "spanned" switch, and monitor for a few days.

You can definitely use SNMP with an Airport extreme as documented here.

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For router traffic I use NetUse Traffic Monitor. If I identify a problem computer, I will start with Little Snitch on the computer.

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Sure i will try it. I know little snitch but i am not there yet, i need to get the culprit first –  menardmam Mar 26 '13 at 16:58
netuse specifically tell, you cannot track usage based on IP –  menardmam Mar 27 '13 at 21:00

I think that Proxifier can be useful for this case. You need create the correct filter for your connection and see the statistics of the traffic network.

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