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identify bandwidth hog

Posted on 2009-05-14
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Last Modified: 2013-12-01
Hello Experts,

I am looking for a way to identify which computer(s) is saturating our T1. Yesterday, on more than one occasion, we experienced complete saturation resulting in short periods of downtime.

The network is comprised of:

Cisco 1841 Router
Juniper NetScreen-25
Cisco Catalyst 2960
2 Wireless Access Points
and various (roughly 60) wireless and wired computers/servers (running XP, 2003, and Mac OS X)

I'm looking for a way to monitor and discover which computer is using all of the bandwidth (preferably open source, but commercial is not a problem). Any advice regarding tools/nex steps would be greatly appreciated.

Thanks much!
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Question by:Daniel_Schafer
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6 Comments
 
LVL 71

Expert Comment

by:Qlemo
ID: 24387168
NetScreen allows with a hidden command to create a short-term profile. You need several steps to accomplish that, I will elaborate on it if you like.
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LVL 1

Assisted Solution

by:chryzophylax
chryzophylax earned 600 total points
ID: 24388589
Depending on the IOS on the router and how your network is connected to your router, you can also use NetFlow on the router to show top-talkers. Check out example-config here:
http://www.cisco.com/en/US/products/sw/iosswrel/ps1838/products_feature_guide09186a0080259533.html#wp1131648
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Author Comment

by:Daniel_Schafer
ID: 24389022
Thanks for the quick responses! I'll look into them both shortly.
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LVL 18

Expert Comment

by:Sanga Collins
ID: 24391712
@Qlemo

could you talk about your technique? my network is exclusively juniper devices and this would be useful info to know
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LVL 71

Accepted Solution

by:
Qlemo earned 1400 total points
ID: 24395142
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LVL 71

Expert Comment

by:Qlemo
ID: 24452779
Daniel_Schafer,
would you mind voting in my article?
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