Network Probing Software

Hi,

I think a device on my network might be saturating alot of my network bandwith.

Is there any free monitoring software I can run on a workstation that will probe the network and tell me whats hogging the network?
BenthamLtdAsked:
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Steve JenningsSr Manager Cloud Networking OpsCommented:
Such a simple question seems like it should deserver a simple answer: Wireshark. It's free. But you need to have an understanding about switches, ports, mirroring, hubs . . . Years ago, it was simple to do what you want to do: plug into a hub and you'd see all the data passing throught that hub. If you have a switch that allows you to mirror ports you can see all the data going through the switch provided your switch is beefy enough to replicate all the data to a single port without causing problems.

What's your architecture? Layout? Complicated? Simple?

Good luck,
SteveJ
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BenthamLtdAuthor Commented:
Setup is simple, standard windows with normal switches.
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Steve JenningsSr Manager Cloud Networking OpsCommented:
What kind of switches? Do they have port mirroring capability?

SteveJ
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BenthamLtdAuthor Commented:
No port mirroring
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Steve JenningsSr Manager Cloud Networking OpsCommented:
Well, can you get your hands on a hub?
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BenthamLtdAuthor Commented:
Sorry, yes, we have one managed switch a Linksys SRW-2024 and 3 other linksys switches that are not managed.
The SRW-2024 does do port mirroring.

What do I need to do?
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Steve JenningsSr Manager Cloud Networking OpsCommented:
Ok . . . I'm not so familiar with that switch but people who are say that you are limited to one RX and one TX port.  So . . . what to do:

Just as an example, lets say you have a router with one local interface and one internet interface, and you have a linksys srw2024 that the router and 10 PCs are cabled to. I would set up wireshark on my pc and mirror the port that the router is plugged into to my pc. That way, my pc and therefore wireshark would see all the traffic in and out of the router. If someone was downloading lots of stuff, it would show up in the "capture summary". More specifically, lets say the router is plugged into switch port 1 and my pc is plugged into switch port 12. I would mirror the RX and TX on port 1 to port 12.

That's very high level.

Are all of your switches daisy chained together?

Good luck,
SteveJ
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BenthamLtdAuthor Commented:
All non managed switches are patched into the managed switch.

I think I can manage to do that.

How would you scan the LAN network to see if something was sending out too much traffic?
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