What is a MAC Address?

[@mdukasa]

Searched for Mac Adress the new channel. This showed video up first.

[@elvara872]

Same here...

[@SankeshwarSivakumar]

This came up in recommend

[@kevinpowers2874]

Same

[@jhinovbot1603]

This kinds of videos I like. No music just visuals and a person talking explaining the concepts.

[@Yasmar_jr]

Ik right the best

[@aspirewot8408]

well dont be selfish the visual and audio helps for people with adhd XD its more interesting

[@acidtalons]

Not sure why linus told me to come here today but I'm here

[@HughRussell06]

Probably because there’s now a Mac Address channel now that LMG runs

[@mrartistimo1530]

@@HughRussell06 Fairly sure they meant that ironically.

[@j3sv1n]

He's playing with us guys! It's actually a new LMG channel, and not anything he said in the video.

[@thellezadeliu3435]

In fact that was not possible!

[@mediocredriver3741]

@@thellezadeliu3435 wdym

[@arundinaceous_123]

LMAO I was gonna comment that

[@runawayj3389]

Lol, "even PC's have a MAC address"

[@feynstein1004]

Damn. Didn't get it when Luke said it.

[@typo691]

Are you never gonna close the quote...?

[@runawayj3389]

Typo​ Their. Happy? 😁 I had seen it but thought it would mess up the time it said it was posted.

[@typo691]

The RunawayJ There* I don't know man, pretty unhappy.

[@runawayj3389]

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.

[@VAISHALIDORANALA]

Techquickie: What is MAC Address?? Me After 4 years: It's a new KZbin Channel from your parent channel LTT..

[@DustyLaptop]

1:06 He said "World Wide Internet" and it's pissing me off XD

[@Ninjakiw1]

same haha

[@lohphat]

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.

[@Robertlavigne1]

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.

[@bobthemagicmoose]

You beat me to it.

[@battlefront987]

Robertlavigne1 Ey a fellow ccna ! I'm currently studying for it , hoping to pass next month

[@hascyhascy]

lohphatTechQuickie

[@phinix250]

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.

[@Luckyman000001]

Searched for Mac address but brought me here.. Was looking for the new channel.

[@MMSCBF]

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.

[@reddragonflyxx657]

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.

[@jhenisethe4th]

ThatGuy 192.168.x.x are private addresses so they aren't routable from the internet anyway.

[@ErikWooldridge]

DDoS a private IP address behind a router

[@riot7917]

+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

[@SzybkiTom]

If you try to DDOS any IP in the 192.168.*.* range, you'll only DDOS something on your own personal network

[@SeleniumGlow]

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.

[@Gunjamed]

fresh books = better in bed? say what!?

[@SayWhatNow92]

i heard that as i closed the tab... had to double check

[@Arudis4x]

Sex sells?

[@thathsaraamarasinghe6774]

You watch the sponser segway??

[@sael40]

4:13 You've convinced me. I'm now signing up...

[@georgequintero8292]

BE BETTER IN BED xD

[@JackLe1127]

ITHURTSWHEN.IP is gonna be my new wifi router name

[@angelodou]

Oh, just like the other 5276 wifis with that name in my city.

[@vixey_aka_blicku1345]

It doesnt hurt when IP if it does to you,you should go to a doctor

[@youtubeistrash6759]

Lol

[@bharatmadho3742]

rest in PP

[@luischavez1701]

Was heading to california on the road and was randomly checking for and actually saw this as someones name

[@Garebare1]

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

[@modables]

Why can't you have your own?

[@Tigeradvenchrer]

Mac Address is obviously the one of the LMG youtube channels that posts videos about apple products

[@Chrisrandomideas]

history of charging ports fast as possible.

[@dukdo7790]

Chris Caldwell Good idea!

[@182ndNegociator]

You should've talked about NAT

[@remingtonrojas]

182ndNegociator they can do another episode=$$$

[@IIARROWS]

NAT has nothing to do with MAC address. It's a TCP/IP technology.

[@Robertlavigne1]

He did talk about NAT indirectly even though it is completely off topic when dealing with MAC.

[@Diamonddrake]

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.

[@prich0382]

It's a pos, so many times my NAT keeps changing from Open to Moderate then sometimes Strict, tried all sorts of fixes

[@GhaziCHAIEB]

It's the name of the new channel

[@ChrisKramer_]

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.

[@johnathankrausrig9237]

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?

[@CL-px8ix]

this guy stresses me out, I found myself holding my breath when listening to him.

[@MC4K]

"Yes, even the PCs" Lol 😂

[@sors07]

Wow, didn't know Freshbooks could do all that!

[@kumbaj1612]

i searched for ur new channel and it got me here XD

[@smorinator]

Probably should have included ARP in this video.

[@TyrantTitan.]

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.

[@milanlilic6995]

the fact that i found this when I was looking for the new channel

[@haonhaon7051]

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.

[@victorburca5028]

Finally, a complete and clearly explanation! Thanks a lot !!!

[@titanicwhiz]

This dude explains things the best

[@Roxor128]

I am pleased to see just how many commenters are spotting the invalid IPv4 addresses in the video. Speaks well about the audience.

[@social3ngin33rin]

I'm slow, this one hurt my head lol

[@ropro9817]

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!!

[@blue6619]

I wont lie these videos really help with my college course i do, thx u techquickie yall be the real ones.

[@thecoderguy_0001]

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.

[@HasanAmmori]

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

[@scheimong]

But Luke, 192.168.1.263 is not a valid ip address! 1:23

[@ARG_ON18]

What about 123.456.789.01? 1:44

[@jeremyaxel]

Антон Аргунов I think it's inspect element because he doesn't anyone to know his public Mac Adress

[@mika2666]

doesn't matter, the numbers between the dots should go from 0-255 and not higher

[@TetraSky]

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.

[@AMABotelho]

What? Any octet in an IP address literally cannot go past 255. Because every octet is a BYTE, which only counts to that number.

[@yenaarts]

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)

[@CalebBabin]

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/

[@yenaarts]

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.

[@CalebBabin]

***** It will show you your IPv4 in certain circumstances but in most cases it now shows me my IPv6

[@CalebBabin]

***** yeah I wish it would show you your IPv6 AND IPv4 if you have both, which is what most people still have.

[@yenaarts]

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.

[@darthob4869]

Man all our routers holes are getting plugged...! Gigiddy!

[@PTNLemay]

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.

[@georgebaggy]

All of your communication protocol videos explain the topics better than my TCP/IP professor at Harvard.

[@tom5243]

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

[@Carefreefour]

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.

[@tom5243]

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

[@Carefreefour]

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.

[@tom5243]

Carefreefour Thank you for the networking lesson I learned 3 years ago in my Cisco class that is simultaneously irrelevant to what was said

[@Carefreefour]

No prob! If you ever wanna get into networking ping me and ill hook you up with some resources!

[@MrMineHeads.]

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.

[@Juggernath]

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!

[@MrMineHeads.]

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.

[@Juggernath]

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.

[@nomenclator4339]

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?

[@Reverseheart03]

The lighting is off, Luke's face is whiter than usual.

[@epender]

Or the white balance.

[@UddhavL]

The the lights are on

[@johniswinning]

Bro the first min of this is better than everything I've read or learned in class

[@onetimeracas5972]

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. (;

[@sherlockmaverick]

Your new Apple-based channel's name. DUH.

[@Clangdon0148]

From back when Luke still worked at LTT

[@ChowCaffe]

MAC address is your new channel guys. Jeez…

[@kalebbruwer]

YOU CAN GET AN UNCAPPED GIGABIT FIBER LINE FOR ONLY $70?! In SA a capped LTE line costs more than that...

[@mr.anirbangoswami]

MAC Address also stands for LMG's latest channel :0

[@AnthonyGoodley]

Yes but KZbin hasn't quite figured that one out yet. I bet it will rather quickly though.

[@RewindOfficialDoesMusic]

@@AnthonyGoodley cat

[@AnthonyGoodley]

@@RewindOfficialDoesMusic I'll see your cat and raise you a dog and 3 parrots.

[@hellterminator]

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?

[@lmxab3ks]

this explained more than my it teacher could, thanks bro!

[@deathbestowerx2577]

Thank you, this helped clear up something I had questioned.

[@ashishsingh-mj1nm]

WOW, THE CONTROL PANEL YOU SHOW IN VIDEO IS SAME ROUTER MODEL WHICH I AM USING. NICE VIDEO BY THE WAY

[@reallyWyrd]

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.

[@krishnastarz]

Guys, your new lighting is awesome!

[@HarvardHeinous]

That color, it's so friggin classy!

[@GaetanAlmela]

is it just me or I can instantly tell when the ad kicks in before he even adresses it

[@pavol5844]

You explained it very understandable. Nice video keep it up!

[@tanmayd9873]

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

[@2010ZR07]

Time to make a version 2 of What is Mac Address video, where you plug in LTT's new channel :P

[@Alexthebrokkie]

in 1:19 the Ip was x.263 , when the Max can be 256 , beside that thank you for sharing !

[@rockerjonni]

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

[@SuperManitu1]

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.

[@MikeNolano]

It's always mind-blowing to me that routers only route one packet at a time... no matter how many devices are connected!

[@phinix250]

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)

[@hellterminator]

+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).

[@SwiftPengu]

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.

[@joeykeilholz925]

A channel that may never be the same

[@DataStorm1]

1. @1:19 192.168.1.263, really? that address isn't possible. 2. @1:43 123.456.789.10.... lol 3. Mac address is in FRONT of the data package, not at the end. That is so to make sure that if the receiver is not the intended recipient, it can let the hardware decide for the package to drop. 4. NAT is really not like that. It keeps session information for 1-4 minutes for all connections made by any host on the private network. It does this by keeping a list of sessions linked with an IP address. 5. MAC address is used LOCALLY only, from one host to another. once layer 2 (the IP) is read by the destiny host it can decide if it was for the host receiving it, and if not, it can be forwarded. Type in a CMD box: ARP -A 6. Any external site will NOT see the private IP address or MAC address. All they see is the external IP, and some random session number. Luke, please don't explain network if you have no good understanding of it.

[@crawlerin]

He probably uses an early version of IPv5. You know, not completely IPv6 because that uses colons, but something in between that allows for more than 8 bits in each octet.

[@ferky123]

DataStorm #1-2 they use fake addresses so that if some people try to type them in for nefarious purposes they won't get anywhere. This is the reason why movies have fake phone numbers. Also this video is an overview and not intended to be used for someone to hack anyone else.

[@200.50kr]

+Alexandra Stanovska i.imgur.com/iMtqa1d.jpeg

[@vladimirlovato4192]

LIES! its a new channel from LMG

[@makemyday4762]

Hey, it's the guy that saved Linus career

[@biffdiff6725]

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.

[@Daniel15au]

... you didn't mention NAT throughout the entire video?

[@MoSLunatic]

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

[@Olfan]

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.

[@crawlerin]

Ethernet protocol you mean, instead of MAC protocol. Unless you still use TokenRing.

[@Olfan]

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.

[@crawlerin]

0lfan you mean it this way, OK.

[@Lycosa]

Lmao! 0:20 THATS EXACTLY My modem. It's a great new high tech modem. Cisco EPC 3928 or something like that. yepper.

[@Rickyp0123]

When I first heard of MAC addresses as a kid, I could not comprehend why a PC would have one. Now at age 22, I have my answer.

[@KyleManel]

giggling at 192.168.1.'263', /smirk

[@BlackiJ11]

why is it 255 at most?

[@JJFlores197]

​@@BlackiJ11 It has to do with subnets. Most home networks are on the /24 subnet (255.255.255.0) that means that there are 256 possible IP addresses with that network. Of those 256 addresses, you have access to 254 of them because you loose 2 addresses. One for your network address and one for your broadcast address. For instance, a 192.168.1.0/24 network means that you have the usable host range of 192.168.1.1-192.168.1.254. 192.168.0.0 is the network address and 192.168.1.255 is the broadcast address.

[@Corrupt_be]

@@BlackiJ11 Late response but it has to do with "bits". Each number in an IPv4 address represents 8 bits (and each IPv4 address is 32 bits). So: 128 | 64 | 32 | 16 | 8 | 4 | 2 | 1 If each bit is set to 1, you end up with the number 255 (128+64+32+16+8+4+2+1). So for instance the ip address 192.168.1.17 in binary ends up being: 11000000.10101000.00000001.00010001 (I hope I didn't mistype). It's easier to see in a table: 128 | 64 | 32 | 16 | 8 | 4 | 2 | 1 0 | 0 | 0 | 1 | 0 | 0 | 0 | 1 = 17 (because 16 + 1) And as @Jose Javier Flores pointed out, the .255 is used for broadcasts (sending to all devices in a given subnet), so that leaves you with 1-254 that can be assigned to devices. Routers or gateways don't have to be .1 or .254, but it's pretty common as a standard to do so. FYI Jose's explanation wasn't incorrect, it just didn't cover the actual reason why 255 is the highest single digit in an IPv4 address.

[@BlackiJ11]

@@Corrupt_be Thank you, so basically we could say the 4 in IPv4 is 4 bytes right? As in 32 bits

[@Corrupt_be]

@@BlackiJ11 Nah that's just coincidence, it's legit just a version number.

[@DerpyNetworking]

1:05 It works the other way around. Routers (DHCP Servers) gives out a private IP addresses via DHCP. Then if a packet needs to go to a certain IP address, it will find out the destinations MAC via ARP. It keeps a table that eventually discards old entries. 1:45 As others have stated (@Hawlucha), 192.168.1.264 or 123.456.789.10 are not a valid IP addresses. Not a knock on you, but it doesn’t seem like you understand routing and switching. For the future, reach out to someone who does and have them check your logic and explanations before you post a video. You totally glazed (Brain fart) over NAT and Private vs Public IP. 1:58 You really missed the key point. You never explained why you needed a MAC and IP address. Simply put, IP is used for getting your packet to its ultimate destination. Grouping computers together into networks to make routing possible which is very similar to a ZIP code. The post office doesn't know every person's name in the US (Every Unique IP), but it can send it to the correct town via ZIP (Network). Once it gets there, you use a street address and/or name. This is where MAC addresses play a role. I like to think of them as DNA. It makes you, you (Unique). In a LAN network, you usually have a switch. A switch typically doesn’t understand IP addresses. It’s a layer two device only, so your gateway/router sends an ARP to find out the MAC address of a specific IP address. Then the router can toss it to the switch and it will understand where to send the frame. 2:03 Of course it may seem redundant, but again we are dealing with two different devices (Switch vs Router). 2:19 Typically, data packet diagrams use this order from left to right. Frame header (MAC)/IP header/TCP header/DATA/frame footer 3:05 is not really security. It’s not even worth mentioning. Right after that you explain spoofing MAC addresses which defeats the security. If you have physical access, you are screwed. If you lose you the Wi-Fi password, again you have no security.

[@seeneverything5150]

what are some good sources to learn about networking and this sort of stuff

[@drstein42]

Mixes the TCP/IP protocol (in the Network layer) with the MAC address used in the Data Link Layer.

[@chrits3396]

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.

[@canadian97]

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.

[@tjarsun]

You can fake a MAC address quite easily.

[@Daniel15au]

Haha, yeah, it's trivial. A lot of network card drivers have a MAC address setting in Device Manager, so you can just change it without any third-party software. Routers have config options to change their MAC address too, as for some ISPs they need to spoof the MAC address of the modem in order to properly connect (if the ISP has a whitelist of allowed modem MACs).

[@phi_b]

You have to be able to change the address, what if there is a collision? After all you paid for a product, and it might not work correctly in that case...

[@Daniel15au]

Philipp Bitzer MAC addresses are globally unique - That's the entire point of them. MAC addresses are 48-bits. 48 bits gives you 281,474,976,710,656 possible combinations, which is definitely enough for every device to have a unique MAC :P The first 24 bits (called the OUI) represents the manufacturer, and the second 24 bits represents the device itself. Manufacturers are supposed to never repeat the same MAC twice.

[@D1ceplaya]

When your dad uses the Linksys Wifi and blocks your mac address so you can't access the internet but then you just change it lmao

[@XBelknap]

This would have been a perfect time for a TunnelBear spot

[@MatheusLB2009]

MAC address is only for Apple devices you silly

[@MatheusLB2009]

lol

[@Naitrio]

I am pretty sure they are joking but ¯\_(ツ)_/¯

[@sethblanton911]

Matheus Lacerda you trying to be funny or dumb

[@saladwithsalad]

hes obviously joking you dumb fuck

[@mjc0961]

MAC addresses are where all those copies of Apple's $300 picture book are getting shipped. ;)

[@sigma-erebus]

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

[@rexy_1000]

This is why you should never connect routers together using ethernet in a loop as the network will be brought to a standstill.

[@MaxArceus]

Gonna be brutally honest here, I always used to think that MAC adresses were to keep compatability with shitty macs which used different protocals or something xD

[@locao51]

Press 1 wait a second press 1 again ( play around with 0 , 7 and 1 to make a cool context )

[@GrumpyOldMan9]

The box in your house is not called a "router" but a "switch". A router is a device to connect different networks.

[@flameheat220]

4:14 Hold up Luke, what now?

[@jbtom321]

Speaking of public and private IPs, can you explain NAT in a video. That would be cool.

[@zacmurphy9995]

Great video! Helped give some more information on the stuff I need to know for ICT A-Level.

[@lawrenceoliva7360]

please more informational videos like this maybe videos on the osi layers

[@Thewho456]

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.

[@daemiax]

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.

[@jackdenhartog215]

Totally thought that the spot around 3 min in was a segway to a sponsor spot.

[@Kieran28]

Found this when looking for the MAC address KZbin channel lol

[@hamilpatel4025]

more networking videos! great job!

[@axtoncommander8312]

Thank you !, this information really helped, keep it up !