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My home wireless network has gotten horribly slow and I'd like to figure out which of the various computers connected (and ideally what program on that machine) is eating up all of the bandwidth. Is there free software that I can use on Windows/OS X that can help me figure this out? I'm not particularly familiar with computer networks so any additional guides/tutorials are very much appreciated.

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I'd suggest using Wireshark : http://www.wireshark.org as one of the best freeware analysers I've used. Be aware than on a non-promiscuous mode network adapter you're only going to see traffic between the computer you've installed wireshark on and the devices that communicate with it or broadcast type traffic.

See here for some additional info: http://www.wireless-nets.com/resources/tutorials/sniff_packets_wireshark.html

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