Clip on cable netwrok connection?

Hey guys,
I use a laptop like many other techs out there and use sniffing products for various troubleshooting techniques. I was wondering if there was such a thing as a piece of equipment that would allow me to snap onto any network cable and establish a network connection and then troubleshoot that particular cable or workstation. I am running into alot of unmanaged cheap switches and have a heck of a time sniffing out the problem machines, particularly when I am hunting down a trojan. If I could just clip onto a wire, then sniff that cable, it would save me a ton of time onsite.
Thanks a million for any sugestions.
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PremierncAsked:
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AutoSpongeCommented:
You mean an ethernet clamp like this?

http://www.lashen.com/vendors/Psiber/PsiberNet_1000.asp
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muhalokCommented:
This is the one u need:

Its called an Ethernet TAP - its passive and allows you to sniff the ethernet (I think it works same way as those Cisco Managable switches - regarding their Port Monitoring abilites to replicate all traffic from one port on another (where the Laptop with sniffer is installed).

http://www.axial.co.uk/netoptics/10-100-tap.asp

http://www.netoptics.com/products/product_family_details.asp?cid=1&pid=4&Section=products&sid=77434293.0316925&menuitem=1
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FrabbleCommented:
Or, you could go the other end of the scale and get a USB port powered mini ethernet hub

http://www.compgeeks.com/details.asp?invtid=A-3097F3

http://www.byteccusa.com/product/network/bt-555LED.htm
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rindiCommented:
get yourself a fluke http://www.fluke.com. These devices are very good on reporting on any network conditions (not cheap, though).
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PremierncAuthor Commented:
Hey Guys,
I like the ethernet clamp equipment. This is what I am looking for. Do any of them allow you to actually plug an ethernet cable directly into them and run a sniffer directly from your laptop?
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FrabbleCommented:
The above give different solutions depending on what you want to do.

The Fluke is just the thing for cable testing and the Ethernet clamp will be great for monitoring signals.

If you need to actually capture and analyse the traffic, which is the way I read it, then you need inserted hardware that does port mirroring or acts like a hub.
No doubt somebody makes clamp equipment that will do this if money is no object :)
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