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Inbound bandwidth Spiking

By kfrost ·
I got a serious problem. Every so often my inbound bandwidth spikes out of control. Sometimes its for few minutes or a few hours. My ISP is charging me for everytime I go over my allocated bandwidth. I had them run a sniffer once and it was able to find the IP address on my end that was the culprit. I can't keep having them do the sniffer when it spikes, because they are charging me and arm and a leg just to run that. Is there any good software I can get where I can do this myself thats free or inexpensive?

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All Answers

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Yes

by retro77 In reply to Inbound bandwidth Spiking

Ethereal is one of the best:
http://www.ethereal.com/

Also M$ makes one:
http://support.microsoft.com/kb/148942

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Thanks

by kfrost In reply to Yes

Ethereal seems pretty good. I just have to figure out how to work it better. Quick question. Can I run Ethereal from a workstation to monitor my network or does it have to be installed on a server?

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Workstation is Fine

by retro77 In reply to Thanks

I preffer a laptop because I can be anywhere...jack in and sniff some packets. Remember that you need to be able to span or mirror your port that leads to the internet. This is done in the switch config. Test after hours...also your gonna have a ton of data. But you should be able to see who the top talker is on your network.

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Excellent

by kfrost In reply to Workstation is Fine

I'm trying to figure out how to use this program but I can't seem to get it to sniff the whole network, only the machine it's running on. Where is the switch config. located?

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In the Switch

by retro77 In reply to Excellent

You'll have to remote into the switch [could be a webpage, might be a telnet sessions, might be a console port]. Then you can span/mirror ports to monitor them.

You'll have to look up how to configure your switch in order to do this.

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