Take a physical inventory first, then move on to the digital one. Unless you can identify everything on your network by its IP and MAC address, you’ll just get a big list of stuff - one that includes any intruders or freeloaders. You may be tempted to just log in to your router and look at its status page to see what’s connected, but don’t do that yet. If (or when) it doesn’t, you’ll be able to quickly eliminate what you do know from what you don’t know. Do an inventory of the devices on it, identify them, and then see if the reality matches up with what you expect. Network admins and engineers will recognise this step - it’s the first step in exploring any network you’re not familiar with. You may be surprised with exactly how many devices you have connected to the internet at the same time. Then write down every device and where it lives. If it helps, draw a map of your home, complete with rooms. That includes items like smart TVs, set-top boxes, laptops and computers, tablets and phones, or any other device that might be connected to your network.
Start with a sheet of paper and jot down all of your connected devices. Step One: Make a Network Mapīefore you even log onto your computer, write down what you think you know. As with every Evil Week post, the point is to teach you how it’s done so you can do it yourself and protect yourself - not exploit others. Your friendly neighbourhood IT department wouldn’t like you port scanning or sniffing packets on the corporate network, and neither would all the people at your local cafe. If not, head over to our Know Your Network night school to brush up first.īefore we go any further, though, we should issue a warning: Use these powers for good, and only run these tools and commands on hardware or networks you own or manage. We’ll assume you’re familiar with some networking basics, like how to find your router’s list of devices and what a MAC address is. In short: You’ll be able to recognise the signs that something on your network is compromised. In this post, we’ll show you how to map out your network, take a peek under the covers to see who’s talking to what, and how to uncover devices or processes that may be sucking up bandwidth. Additional images by Thomas van de Weerd and Linux Screenshots. Title photo made using Christos Georghiou. Let’s talk about how you can, with the power of evil, sniff around your home network to make sure you don’t have any uninvited guests.
Inside it lies tons of valuable information - unencrypted files, personal, private data, and perhaps most importantly, computers that can be hijacked and used for any purpose.
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