whenever you click on an enticing Link in a web browser the website you're
looking at knows to send whatever the link contains to your computer and not
your neighbors because your computer sends its IP address kind of like a
return address on an envelope but as it turns out IP addresses only get you as
far as the modem you have in your house and these days most of us have tons of
things connected to our routers especially wirelessly phones laptops
tablets computers other people's phones
consoles CH casts oh and they're all
connected nearly all the freaking time
you don't really want to be thinking about it so how does your home networking equipment know to send those
questionable videos to you and not your
parents sitting in the Next Room well each device on your network has
something called a Mac Address yes even the PCS Mac in this case stands for
media access control it identifies which
device is which on your local network so
here's how they work when data arrives at your home from the worldwide internet
your router needs to decide which device to send that data to it does this by
keeping track of the Mac addresses of all the devices connected to it then
assigning what's called a private IP address usually starting with 1
192.168 to every device this is also why
you usually punch in those numbers to access your router's control panel
through your browser this is very different from a public IP which is what
the rest of the internet sees as being your IP address for your entire home
network and what comes up when you type what's my IP address into Google your
router keeps track of outbound requests such as when you click on a link so when
the data you want arrives at your router it attaches the correct private IP
address to the data packets ensuring that they got to your computer or device
since all those private IP correspond to the correct Mac Address now this might
understandably seem a little redundant since your computer now has both a
private IP and a Mac Address that can both individually identify it but in
reality you need both since although both the public and private IPS stay the
same throughout this process the Mac addresses on the data packets are
constantly being changed they only tell the data where to go for its next hop
when your data gets to the next device the Mac Address has changed in order to
tell it where to go well next since your data might go through numerous servers
and routers before it finally gets to your device Mac Address information is
crucial even though you have a private IP another upside of Mac addresses is
that normally they always stay the same with many devices having their Mac
addresses hardcoded into the firmware at the factory making it easy to spot a
malfunctioning device on the network if you're trying to troubleshoot and if you
want to protect your network by making it so that only devices that you approve
can connect many routers use Mac addresses to restrict access to known
devices very useful if you're worried someone might try to steal your Wi-Fi
password or even plug in physically isps
also use predefined Mac addresses to make it easy to provide you with the
service you paid for so that your neighbor isn't the one getting that
expensive gigabit connection that you're shelling out money for every month of
course they also use these to block access if you aren't paying your bills
however so type that as you will it is possible to spoof a Mac Address however
and you might want to if you're concerned about your privacy on a public
Wi-Fi connection or you connect a new device to your network that your ISP
might not recognize but be for warned that this might not make your ISP happy
depending on who they are actually who am I kidding it probably doesn't depend
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tequi and enter Techquickie in the how did you hear about a section all right
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next time I'm going to go play with PlayStation VR for an LTT video which
you'll also see in the future