What is a MAC Address?
ฝัง
- เผยแพร่เมื่อ 5 ก.ย. 2024
- Every piece of network-capable hardware comes with a MAC address, but with everything already being assigned a local IP address, why are they necessary?
Freshbooks message: Head over to freshbooks.com/... and don’t forget to enter Tech Quickie in the “How Did You Hear About Us” section when signing up for your free trial.
Follow: / linustech
Join the community: linustechtips.com
![เปิดใจ พี่ญา คนรุม หลังทัวร์ลง หนักสุดในชีวิต!! l [Nickynachat]](http://i.ytimg.com/vi/2-OJZRtclro/mqdefault.jpg)
Searched for Mac Adress the new channel. This showed video up first.
Same here...
This came up in recommend
Same
This kinds of videos I like. No music just visuals and a person talking explaining the concepts.
Ik right the best
well dont be selfish the visual and audio helps for people with adhd XD its more interesting
He's playing with us guys! It's actually a new LMG channel, and not anything he said in the video.
In fact that was not possible!
@@thellezadeliu3435 wdym
LMAO
I was gonna comment that
Not sure why linus told me to come here today but I'm here
Probably because there’s now a Mac Address channel now that LMG runs
@@HughRussell06 Fairly sure they meant that ironically.
Lol, "even PC's have a MAC address"
Damn. Didn't get it when Luke said it.
Are you never gonna close the quote...?
Typo Their. Happy? 😁 I had seen it but thought it would mess up the time it said it was posted.
The RunawayJ
There*
I don't know man, pretty unhappy.
Typo 😰 Isn't "there" used for pointing at stuff. Like, "the cat is over there"
Whatever, I just hope you can find your happiness elsewhere.
Techquickie: What is MAC Address??
Me After 4 years: It's a new TH-cam Channel from your parent channel LTT..
This video is all over the place. You cover MAC addresses, IP addresses, NAT, and spoofing in the same video. Too much info.
Simply put, the MAC address is the unique hardware address set by the manufacturer. It it unique in all the world (relating to ethernet h/w addresses). It allows the router to assign IP addresses to the local hardware.
Why have MAC addresses at all, or IP if the hardware address is already unique? Simply put: there's more than one networking protocol which can use the same network infrastructure. Be it IP, SPX, AFP, etc, all of those are independent of the hardware. The MAC address simply allows any protocol to match to the hardware.
Also not mentioned, MAC addresses are a feature of Ethernet, a physical layer specification. Other non-Ethernet protocols like FDDI, SONET, Token ring, etc handle physical addresses differently.
Agreed, This video was very confusing to me (and I'm a CCNA so I understand the technology he was trying to explain). He tried tying in our common use of NAT to justify MAC addresses but this isn't the purpose of MAC at all, in fact NAT/PAT don't need MAC addresses at all just port numbers and insides/outside ip addresses. This topic deserves a second try. Like you said, MAC is used solely at Layer 2.
You beat me to it.
Robertlavigne1 Ey a fellow ccna ! I'm currently studying for it , hoping to pass next month
lohphatTechQuickie
I will point out their are some chips that do not have the harware set MAC address. I have one from asus where i can change it to what I want (while it is the same effect as spoofing it is actually changing the address on a driver level rather than intercepting and altering) which is why i went away from MAC address whitelisting.
I didn't expect CCNA and CCNP certified pros to watch this. I'd agree with them that this video is a bit all over the place, but TBH, this is the best way to get this concept across the board to someone who doesn't have time or patience. This strangely includes the sales people I have to deal with in my job. They don't care about accuracy, they care about simplicity.
Searched for Mac address but brought me here.. Was looking for the new channel.
Mac Address is obviously the one of the LMG youtube channels that posts videos about apple products
I lived in a apartment that used wireless access points to connect wirelessly and my room was pretty far from one. They didnt allow personal routers. You had to enter in the MAC address of all ur devices and you were limited on the number you could use. I plugged in the router in the wall and im not sure if it knew it was a router but it didn’t work. So I spoofed the MAC address of the router as my PC and it worked perfectly fine with as many connections as I wanted
Why can't you have your own?
4:13 You've convinced me. I'm now signing up...
BE BETTER IN BED xD
1:18 192.168.1.*263*? Do you mean 192.168.1.*253*? You can't get anything higher than 255 with only 8 bits.
Hawlucha
Also MAC address filtering doesn't work to block passive attacks (as even unapproved devices can listen) or active attacks/connections (as network cards can spoof their MAC address). Nice idea... if only hackers followed the rules it would have worked too.
ThatGuy 192.168.x.x are private addresses so they aren't routable from the internet anyway.
DDoS a private IP address behind a router
+ThatGuy u cant ddos someone just by private ip u can but u need to be connected to their home network or wifi and then it can only be done by a udp attack
If you try to DDOS any IP in the 192.168.*.* range, you'll only DDOS something on your own personal network
1:06 He said "World Wide Internet" and it's pissing me off XD
same haha
my suggetion if TQ is reading this, is to make a mini series on what a packet is and how it gets from your network to the server you are connecting to and back. i know that this could get really complicated really fast, but yiu dont need to talk about handshakes and get in to too much detail. good points to hit:
OSI model (condensed lol) if you havent already
-what a packet is and what it consists of.
-what your and the other routers does to it when it leaves your node and how it knows where to send it next (condensed) maybe with a brief mention of routing protocols.
-what the sever does to the packet when it gets there, such as how it knows which node to send it to (which could tie in with you network with the return trip)
or is this too indepth? it would bw a great refresher to some and a great topic so people kinda know what is actually going on.
They clearly struggle with the most basic stuff in the it world. how they should even managed to explain things they dont get used to know?
Your new Apple-based channel's name. DUH.
Is it just me, or are the embedded ads--in this case, Freshbooks--eating a larger and larger proportion of these videos?
This was a 5m26 video and the Freshbooks ad begins at 3m55s!!
You should've talked about NAT
182ndNegociator they can do another episode=$$$
NAT has nothing to do with MAC address. It's a TCP/IP technology.
He did talk about NAT indirectly even though it is completely off topic when dealing with MAC.
It's not a mess, it's dirt simple. The outside network views your entire inside network as having 1 ip address, your router modifies the packets going to and from devices on your local network (to/from the external network) so that the outside network doesn't know your computer isn't the router (it does this by using unused random port numbers and making a lookup table) when the outside network responds, your router then sees traffic to a port, checks its table to see if it translated a local address for that port, and if it did then it modifies the packet to be directed to your local device and send it on its way. NAT is just changing addresses and ports between local and external network communication. Could easily be explained with a 5 second animation.
It's a pos, so many times my NAT keeps changing from Open to Moderate then sometimes Strict, tried all sorts of fixes
i searched for ur new channel and it got me here XD
"Yes, even the PCs" Lol 😂
MAC addresses are used on the data layer of networking for switching purposes only. IP addresses are associated with routing layer network management.
You can assign multiple IP addresses to a single physical interface (with a MAC assigned to it), so that's another reason why.
ITHURTSWHEN.IP is gonna be my new wifi router name
Oh, just like the other 5276 wifis with that name in my city.
It doesnt hurt when IP if it does to you,you should go to a doctor
Lol
rest in PP
Was heading to california on the road and was randomly checking for and actually saw this as someones name
Amazing video as always! Helpful and informational! Keep up the good work! Just a suggestion, maybe throw in the address resolution protocol in there next time, as it is also fundamental to the process of going from MAC to IP, and might also help to clear up some confusion.
fresh books = better in bed? say what!?
Gunjamed C. Yeah, I was like: well that's a nice addition to accounting. :)
i heard that as i closed the tab... had to double check
Sex sells?
You watch the sponser segway??
this guy stresses me out, I found myself holding my breath when listening to him.
history of charging ports fast as possible.
Chris Caldwell Good idea!
Man all our routers holes are getting plugged...! Gigiddy!
Probably should have included ARP in this video.
the fact that i found this when I was looking for the new channel
I am pleased to see just how many commenters are spotting the invalid IPv4 addresses in the video. Speaks well about the audience.
YOU CAN GET AN UNCAPPED GIGABIT FIBER LINE FOR ONLY $70?!
In SA a capped LTE line costs more than that...
MAC address is only for Apple devices you silly
lol
I am pretty sure they are joking but ¯\_(ツ)_/¯
Matheus Lacerda you trying to be funny or dumb
hes obviously joking you dumb fuck
MAC addresses are where all those copies of Apple's $300 picture book are getting shipped. ;)
It's the name of the new channel
This dude explains things the best
Finally, a complete and clearly explanation! Thanks a lot !!!
This is just another reason why Steve Jobs was so great, he invented Mac addresses to be used by Macintosh computers on the AppleTalk network back in 1985.
Fault number one: at 1:19 Private IP addresses range from 0.0.0.0 to 255.255.255.255, 192.168.1.263 is an impossible IP address!
Fault number two: at 1:43 IP address 123.456.789.10 is an impossible IP address (I know, I'm just saying)
Fault number three: at 1:43 Google displays your IPv6 address, you specifically need to ask for your IPv4 address, reason: the last public IPv4 address was handed out during I think 2012, so google uses now IPv6 addresses
Fault number four: at 3:34 Mac address spoofing is also illegal, (in a lot of countries)
you dummy, you think people put random phone numbers in movies? no, they put fake ones that are not valid or register the number in most cases.
and yeah everything is switching to IPv6 instead of IPv4 because there are waaaaay more possible ipv6 addresses and you wont have to use mac addresses in the same way because each device on your network will have its own IPv6 address.
For an example of how much bigger IPv6 is here is a thing: www.howbigisipv6.com/
Well first of all, if you make an educational video you should use real valid addresses, for example use the 240 range, those aren't used or pick a random one like the type A, B or C addresses. Not a non-existing one, cisco does the same thing.
And also, by the ISO model MAC addresses will still need to be used because MAC addresses are on the Data Link layer used for routing and switching. Network devices only look at the MAC addresses of a frame not the (IP-)packet addresses stupid. It's impossible to get rid of MAC addresses, every argument you can make why they should get rid of mac addresses is just stupid to think about (like you just did), it's just impossible to get rid of MAC addresses.
And of course IPv6 addresses have way more possibilities, it also makes routing and switching a lot easier but don't forget that the overhead increases.
And finally an educational video should really mention that MAC address spoofing in a lot of countries illegal is, or just don't mention it at all.
***** It will show you your IPv4 in certain circumstances but in most cases it now shows me my IPv6
***** yeah I wish it would show you your IPv6 AND IPv4 if you have both, which is what most people still have.
James Stine well MAC address spoofing is in all cases illegal, a MAC address is baked into your NIC and changing that is equal to falsifying someone's identity card. This is literally in my theory book of Cisco.
Wow, didn't know Freshbooks could do all that!
MAC Address also stands for LMG's latest channel :0
Yes but TH-cam hasn't quite figured that one out yet. I bet it will rather quickly though.
@@AnthonyGoodley cat
@@RewindOfficialDoesMusic I'll see your cat and raise you a dog and 3 parrots.
This is badass because in Tech Support there was this issue with customers who hadn't agreed to Provision Terms, and all I needed was their MAC address. A tool would refresh it and take down the trial wall that the company employs to be cringe worthy to their customers. That was probably my favorite part of the job, besides the many kudos. (;
Greetings to you
Do you have an explanation of how to configure mac ip wifi to be
Virtual server (external) when connected to the Internet
2_How to convert it to IPv4 format
All of your communication protocol videos explain the topics better than my TCP/IP professor at Harvard.
Time to make a version 2 of What is Mac Address video, where you plug in LTT's new channel :P
I wont lie these videos really help with my college course i do, thx u techquickie yall be the real ones.
Security is the way they explained it to me in my programming course. Basically, the guy in charge of the servers at your school or company or whatever can hand out MAC addresses that are asigned to IP addresses. Then if the people who got those MACs want to be sly and use those addresses for nefarious purposes, the server guy just switches around the MACs. And for unclear reasons, they prefer not to switch around the IPs, those want to stay the same if they can.
Explanation will work better if you mention the seven layer network model-- layer 2 addresses vs layer 3. layer 2 is just for the LAN itself, layer 3 is for the INTER-network.
While the explanation later in the Video is kinda right, your base statement is wrong. MAC addresses are not connected in ANY way to private/public IPs. They are not the reason they are needed.
A MAC address is just to identify the next device that should respond to the packet sent on that wire (as a wire may have multiple devices connected). The IP address in the packet is the target/own address that does not change once past your router (the router changes the IP from your private IP to its public IP, because you cant address a private IP in the global internet). The IP is then used by routers to figure out the next device to sent the package to and changes the MAC address accordingly.
Have been in IT for 10 years now, never have thought of MAC being used for hops between network devices. Feeling stupid and grateful at the same time
is there any difference between PCs and mobile phones MAC address that is connected in network,
i mean how to figure out which one of the MAC Address is from the mobile and which one is belong to the computer
thanks
I wish you had mentioned the fact your request along withyour mac address gets associated with a specific port number before leaving the local network
Not necessarily, the mac address only specifies the next hop. On the OSI model, MAC addresses are layer 2. What you are referring to are sockets, which are used to let the application layer (5) talk with the network layer (3). So sockets are a layer 4 technology (thats a lie if you are working with IPv6, but we are talking IPv4 right now). So the socket would look like 172.62.5.10:80 for the client and something like 192.167.10.5:25684 on the server end. An IP and a socket.
I could've and probably should've worded it better. But I was talking specifically about what your homes router does to ensure that the information going out/in from the same source and session goes to the correct local ip/mac
Well, inside of the switch, there is a CAM table, inside of that it maps layer 3 to layer 2, so it maps local ip addresses to mac addresses and it gets those through ARP. So when it sees the packet comping from the ingress port it takes the ip, finds it in the cam table, and sets the mac address in the header to the one mapped to that ip and sends it on the wire.
Carefreefour Thank you for the networking lesson I learned 3 years ago in my Cisco class that is simultaneously irrelevant to what was said
No prob! If you ever wanna get into networking ping me and ill hook you up with some resources!
Mixes the TCP/IP protocol (in the Network layer) with the MAC address used in the Data Link Layer.
I'm becoming a CCNA certified technician at my high school (fancy way of saying I am learning Cisco Networking) and let me tell you, MAC is the easiest shit in the first semester.
I did CCNA for one semester in a 2 year course years ago dealing specifically with Cisco enterprise routers and switches, nothing else. I tried venturing out of the few chapters we studied in the all encompassing 1600 page textbook and most of it went right over my head. Good luck!
Juggernath you were still using textbooks? I haven't taken a single page of notes (other than subnetting but that ain't really notes). Everything is online and we read everything from their website.
Hassan Tahan
Yeah, 2009 was still textbooks in college. Post secondary institutions make a pretty penny off expensive textbooks, I think my CCNA alone ran $450 if I remember correctly. In two years I ended with a stack of textbooks like CompTIA A+ Hardware, CompTIA A+ Software, CompTIA A+ Security, Photoshop Essentials, Flash, Visual Basic, .ASP, HTML/CSS, 2 or 3 books on Microsoft Server 2003, Microsoft Exchange, Security+ and a couple other odd ones for stuff like helpdesk work and business structure.
You can probably get most this stuff now cheaper on Amazon but they didn't carry any of what the class required on the Canadian site at the time so the only option was to fork over an arm and a leg to the college store.
My pc is connected with a powerline adapter that connects to my Linksys router (E2500). For some reason every now and then my pc doesn't update the DNS and I have to flushdns from the console which solves the problem instantly. Any advise on how to solve this permanently?
I'm slow, this one hurt my head lol
One little correction, at 1:43 the IP address shown is wrong as limit is 255, so its kinda visualisation, I know but not to be confused.
WOW, THE CONTROL PANEL YOU SHOW IN VIDEO IS SAME ROUTER MODEL WHICH I AM USING. NICE VIDEO BY THE WAY
From back when Luke still worked at LTT
This is *massively* inaccurate. MAC addresses are not “used by your local network.” You use them, your ISP uses them, maybe even your ISP's ISP uses them.
IIRC you already have a video about ISO/OSI, so why not reference that and say that MAC addresses are an addressing scheme used at the data link layer (layer 2) by Ethernet and derived technologies?
The lighting is off, Luke's face is whiter than usual.
Or the white balance.
The the lights are on
Thank you, this helped clear up something I had questioned.
Hey, it's the guy that saved Linus career
You explained it very understandable. Nice video keep it up!
If you were to explain what is a switch (a level 2 equipment) , you wouldnt have trouble explaining the necessity of MAC address... the common household routers AFAIK have an inbuilt Switch or have switch capabilities.
Lmao! 0:20 THATS EXACTLY My modem. It's a great new high tech modem. Cisco EPC 3928 or something like that. yepper.
Do a video on DNSSEC. In the Netherlands there is a provider that now uses DNSSEC, they are the first provider in the Netherlands that uses DNSSEC
ipv4 gets you further though, in games you can just type it in and it will know where to go... even immediately check the standard port for a game and if there is join it
You need to explain layer 2 MAC and Layer 3 IP and the devices for each Layer and how each hop changes the IP address header and MAC table routing in Layer 2 switches, you were confusing to nubies.
Bro the first min of this is better than everything I've read or learned in class
in 1:19 the Ip was x.263 , when the Max can be 256 , beside that thank you for sharing !
the max is .255 since .0 is the first address. .255 can't be assigned, because it is the broadcast address. so the last possible assigned address will be .254 in a /24 network
Hey Luke L. This video has brought me information. This information is some that I have not had before. For that I thank you. Thank You Luke L of Canada.
Hi guys, great video. Can you make another fast as possible video on the subject of IMEI for mobile phones and how it works?
... you didn't mention NAT throughout the entire video?
So if I can find a way to intercept a data transmission, get hold of the MAC Address in the header of the packet and work it backwards to the source of transmission, I can get the location and access to the device connected to the router?
Great video! Helped give some more information on the stuff I need to know for ICT A-Level.
To my understanding, the translation from public address to private address occurs at the router. Yes, the router may track which websites/public IP's I want to access and routes those public addresses to my computer. However... what if two devices try to communicate with the same public address through the same router? What then?
Isn't this where port address translation (PAT) comes in? So that way two local devices using the same router/gateway to the public internet can connect to the same remote/public address without the data between my two local devices getting crossed?
I have on queation is it posible to have a working phone of pc whithout a mac adres and stil acces the internet ?
Thank you !, this information really helped, keep it up !
Try and explain spanning tree or frame relay or even the difference between IPv4 and IPv6 something like that I would like
Justin Turbeville check earlier videos mate, I'm sure they have done a video on ipv4 and ipv6
please more informational videos like this maybe videos on the osi layers
How about explaining that network connections are layered and that a MAC address works on the data link layer and an IP address works on the transport layer? You can run IP traffic over layer 2 protocols other than MAC, and you can run network protocols over MAC which don't use IP addresses. The two are often used in tandem but they are completely independent.
Ethernet protocol you mean, instead of MAC protocol.
Unless you still use TokenRing.
I mean what I say. Ethernet is one thing that uses MAC, WiFi is another, FDDI yet another, that's why I say MAC and not just ethernet.
Token Ring networks didn't use MAC the same way, it allowed for all devices on the ring to have identical MAC addresses because it didn't need to care about that.
0lfan you mean it this way, OK.
A another fact is that a Mac Address falls under the Layer 2 protocol and L2 devices such as switches mostly handles and keeps track of your mac addresses.
3:22 this video is from 2016 and you mean to tell me there were companies offering 1gb speed for $70 back then?! Hell, it is 2021 now and i can’t get such low price for half that speed.
Speaking of public and private IPs, can you explain NAT in a video. That would be cool.
With the advent of IPv6, you aren't required to use the public/private distinction anymore, there are enough addresses available to give every person on the planet 64k addresses.
But Luke, 192.168.1.263 is not a valid ip address! 1:23
What about 123.456.789.01? 1:44
Антон Аргунов I think it's inspect element because he doesn't anyone to know his public Mac Adress
doesn't matter, the numbers between the dots should go from 0-255 and not higher
technically, it is, if your network doesn't start at 1. Which you can easily do with most routers. Though there's no real reason to do so.
What? Any octet in an IP address literally cannot go past 255. Because every octet is a BYTE, which only counts to that number.
That color, it's so friggin classy!
Mac spoofing is annoying for isps. I work for one in the north east USA and the main issue is with spoofing a modem's MAC. We identify which modem's get service/speed based on the mac. So people can spoof a mac of someone who has our service. Because of that, Both modems will have internet access even though only one is being paid for. Another reason why people get disconnected at the pole. I've seen someone with 8 ip addresses attached to his mac... he claims he had no idea. Then again he may have been telling the truth and wondering why he kept getting blocked due to DMCA violations.
this explained more than my it teacher could, thanks bro!
clarification.
RFC 1918 (private network IP addresses) has nothing to do with MAC addressing.
Make a follow-up video on ARP to make this video make more sense.
Guys, your new lighting is awesome!
It's always mind-blowing to me that routers only route one packet at a time... no matter how many devices are connected!
well that's primarily due to hardware, most routers only have a small arm single core processor (because that is all they need) some more complicated setups do have an address table with multiple processors fetching and writing address links (theoretically making them work with multiple packets at one time, but only to different connections - you are still only going to get one packet at a time for one network connection)
+pop pop Home routers, yes, enterprise routers (like the ones ISPs use) don't technically need one because the routing is mostly done as frame relay or MPLS or some other NBMA protocol (because IP based routing is *very* slow in comparison).
So when the route/network receives a packet from the Internet, how does it know which individual device its intended for? Does the data packet have a private IP or MAC address attached - but you said both of these things were unknown to the wider world.
Are those fibre package prices normal for the US? Those packages are less than half the average prices here in South Africa. The max speed we get is 100mbps too... So jealous
i want to ask that a private address is same for a device all the time or it is changing
Is it a good idea to allow apps to share your mac address for advertising purposes?
LIES! its a new channel from LMG
0:21 You think you have tons of devices connected to your router past-Luke, you haven't even seen half of it yet, in just 5 years you'll have double of what used to be connected to your network
I spoofed my MAC over Comcast/Infinity many, many, manyyyyy times and never had problems with ISP, EVER, WITH EVERYTHING. Call me when your industrial Canadian speeds match up to my apartment.
Can U make a video explaining the numerous display configurations (fixed refresh, capped FPS, vsync, Gsync, fast sync, triple buffer....), compare them with each other and recommend which choices/combinations are the best? I know U have made videos about most of them but they are very loosely linked together which doesn't help us make choices.
I am currently trying to figure out if Fast sync + in game FPS cap + my frame rate ALWAYS absolutely staying above my refresh rate will give me this: no tearing + little input lag + make sure my GPU really renders at 61 FPS to keep it cool and quite.
This is a complex question that is really hard to answer, and it's not even the most complicated one I've seen online. I feel like that such an episode would help a lot of people out.
Ok please answer me when i connect my consol to my router it needs alternate mac address so i enterd the one that is under the router in consol. now it doesn't even connect. Would you help me?
Wait i thought ipvr is the specific thing connected to the modem