The computer sends a request to all devices on the network, for example, “who is 192.168.1.1” and the router, upon seeing its address, will send in response its MAC. But every time he needs to send a packet, he needs to convert this universal IP address to a low-level address of the network technology used, for example, for the wired Internet – this is the MAC address.įor this, the ARP protocol is used. The computer knows the IP of the router, it got it when connected to the network. ARP poisoning Attack in EttercapĪs I said, with this attack we can force the target computer to send packets not to the router, but to us. First we look at how the ARP-poisoing attack is performed. The main window of the program looks very simple. We use the -E option for sudo to save all of our user’s environment variables. For example, to install Ettercap in Ubuntu, run: This is a fairly popular program among network security experts, so it is in the official repositories of most distributions. Now let’s take a look at how to install and use Ettercap. In addition, the utility can perform denial of service attacks and scan ports.

DNS attack – when a computer tries to get an ip address for a domain, we substitute this address for its own, but for this type to work, you need to use the ARP method.Įttercap Linux can perform both types of attacks.

ARP attack – using the features of the ARP protocol, your computer tells others that it is a router, after which all packets begin to indulge in it.

The computer through which the packets will pass can analyze the source, target address, and if they are not encrypted, then their full contents.There are two ways to do MITM (Man In Middle Attack): But for certain reasons, the packet can be transmitted not to the router, but immediately to your computer, and only then to the router. By default, the computer sends all network packets that need to be sent to the Internet and sends it to the router, which in turn sends them to the next router until the packet reaches the target.

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