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I am facing a huge problem in my shared network. We are almost 30 users sharing a single internet connection.

Someone is using NetCut and taking all the bandwidth from us. Not allowing even to send e-mails. This is frustrating.

Is there any way to protect my computer from NetCut? Is there any way to block the use of NetCut at the router?

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Do you know they are using NetCut specifically? Who's the network administrator? What kind of routers? What have you tried already? –  techie007 Oct 14 '12 at 18:20
    
Is this a wireless or wired network? More details, please –  Michael Hampton Oct 14 '12 at 20:06
    
I don't have the administrative rights. I know they are using NetCut because I saw them using and I downloaded NetCut and NetCut Defender it shows how many users are using NetCut. If somebody using it then there is column in this software called protected by netcut and the value is yes. –  Dibya Oct 15 '12 at 2:48
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2 Answers

up vote 1 down vote accepted

Apparently, the people who wrote NetCut also wrote something called NetCut-Defender which protects from NetCut itself.

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They claim that it will protect from NetCut but sorry to say it doesn't work in protecting. I did some research before asking this question. I tried using some software to change my IP didn't work even. –  Dibya Oct 14 '12 at 17:41
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Anyone using this tool in an academic or corporate network (and most other networks) would face disciplinary sanctions. Talking to the network administrator would be the best thing to do.

To immune yourself to it, you would probably need to setup a static arp entry for the router, block all broadcast traffic you send, and send gratuitous ARPs to the router as unicast (frequently). Probably all that after having changed your MAC address. Even then, if the "attacker" managed to poison the forwarding table of the switch you're connected to, your MAC address may leak to it.

You could also counter-attack or use the same tool as him, but you would be liable to the same sanctions as he does.

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Counter Attacking helps before asking this question I started counter attacking. Good suggestion but what exactly I can do without having the administrative rights? Is there any tools which can protect my system form ARP? –  Dibya Oct 15 '12 at 2:51
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