Arp Poison Netcut

Well, lets see, who doesnt endure about netcut ? Netcut has been around for sometimes as a handy little tools to wreak havoc on local data processor networks and disable the victim from connecting to the internet. But how precisely is this things works ? what does it have to do with ARP ? what is ARP anyway ? Ill pass off out a brief explanation on this topic, nutrition reading :)

Okay, what is ARP ?

The Address Resolution Protocol (ARP) is a computer networking protocol for determining a network hosts Link Layer or hardware character reference when merely its Internet Layer (IP) or Network Layer address is known. Thats what wiki said. In simple explanation, its a method for a machines that machine-accessible to the local network to determine a PC fix only using its IP.

How ARP works ? How the hell it is exploitable anyway ?

Okay, networking 101, we either know that when a PC, lets say, PC-A (192.168.1.1), wants to send a package to PC-B which has IP 192.168.1.2, accordingly PC-A wont be able to unless PC-A know what is PC-B machine address (MAC ADDRESS). The first thing it provide do is asks the whole network, who has IP 192.168.1.2, and eventually PC-B will answer its band wish Hey, I am 192.168.1.2, my MAC are 1f:00:24:12:22. After that, the package then send to PC-B.





Eventually, without even universe asked, a PC can displace a package which broadcast that he is what he is. Its like Hey, I am PC-C, my IP is 192.168.1.3 and my MAC Address is 1f:00:24:12:23. All the other PC on the network will keep the record on a cache called ARP Table. The problem is, they wont authenticate the validness of the broadcasts. They will just accept the broadcast and update its ARP Table.

That being said, now here comes the dirty thing.

What will happen if utterly PC-D with IP 192.168.1.4 claimed and sent an ARP package saying that he is PC-B ? well, PC-A will just believe it and send the package to PC-D instead. IT IS EXPLOITABLE!

So, how netcut works then ?

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