Mac Addresses Explained
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- čas přidán 21. 07. 2021
- In this video I discuss how MAC addresses work
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and be sure to click that notification bell so you know when new videos are released. - Věda a technologie
had 4 courses on networks at my college, that part about translation and mac addresses was a big blur until now. godspeed gentooman.
>retook the same course 4 times and still didn't get it
@@kirayoshikage4057 And you still using greentext notation in 2021 go back to /g ffs
He didn't mention how the traffic actually splits at the router/gateway via Port Address Translation (PAT) though, the part about assigning IP configuration to devices using MAC addresses is correct but has nothing to do with how local network devices communicate with public hosts (since it all works on layer 3 and above)
@@MoarpheXx There isn't much need to go in the nitty gritty details and talk about OSI standards and its layers I think, he usually makes bite sized videos covering the most important aspects and how it matters for your security and privacy and a simple enough recommendation. One can always go deeper when something peaks his/her interest!
@@zehph I wasn't focusing on the details of the OSI model but was rather referring to OPs point that MAC and NAT had something to do with each other given his impression, I know Kenny makes very summarized videos about these topics and I can tell that since I read some books about networking myself and even got some Cisco certificates in that field, I just wanted to correct on that little thing for OP and anyone reading the comments who wants to find out more about that
This guy gets it! Pretty much everything in this video is spot-on, except:
- 802.11 is WiFi only. Ethernet is 802.3 and Bluetooth is 802.15.1.
- Most big vendors (like Sony) don't reuse MAC addresses, they just register more OUI blocks and/or buy another vendor's unused space. (But some smaller ones DO reuse, so Mental's point is still valid.)
- NAT converts Internet IPs private LAN IPs, because the latter aren't valid on the Internet at large. It is true that your MAC address isn't used on the Internet either, but that's because MAC addresses are only for communication across a single link. NAT is uninvolved here.
- Changing your MAC address for privacy isn't something you need to do by hand. Modern Windows, macOS, *nix systems using NetworkManager with the right config, and Android/iOS will all do this for you.
How often does it automatically change?
@@rekunan I can only speak for my setup, but it's unique per network, per boot, with a fully random MAC used when scanning WiFi. NetworkManager lets you configure how exactly it behaves. No idea about other platforms.
@FnLn Unsure about Win11, but if Win10 has it turned off by default, they probably kept that. Still - better to turn that setting on once than to go into your connection properties every day! :D
Also that's illegal in certain countries if not in all of them
@@TheGreenWaver Legal in the US, EU, and Canada at least. Which countries do you have in mind where it's illegal?
@@TheGreenWaver also interested where it’s illegal
One of my comp sci teachers who's been teaching for 10 years told me when I asked her what I Mac address is and she said it's for MacOS ☠️
@Caliber-Calibur bruh
I know the MAC address 😎 it is 1 Infinity Loop, Cupertino, CA 95014
Yea you have a lot of boomers teachers that don't know much about computers teaching comp sci because they lack younger teachers when i was in school all we learned was how to use Microsoft word and how to type quickly.
@@belstar1128 I have some teachers in uni who almot 80 years old, yet they quite compitent with things like modern languages and proccessor architectures
@@MrMediator24 Yea and while i said boomer teachers my teachers where only about 10 years older than me born in the 1980s so there is no excuse the female teachers where very bad with computers even if they where not that old the males where ok ish if they where young but there where not many and the older ones had no idea what they where doing too
but if you are a high school teacher you do not need to same standards as a university professor
ah, so the NSA interrogation has finally come to an end?
yes, they traded me alien technology in exchange for letting them live
@@treach_ lold
@@treach_ Lmao
@@treach_ hahahah baste
@@treach_ Nice
Have a nice day everyone.
m.czcams.com/video/_mkiGMtbrPM/video.html
no need to thank me
@@memesfromtheforsakenworlwi9218, my day is ruined, thanks.
thanks you too
Hope you have one too
4:05 That's not really true. If Manufacturers are used up all there address, they simply get an additional address range. In that case, Sony would get 00-11-15.
Yes this is true i don't about the thing in the video.
👍
sh*ut up
"MAC Adress? But I dont even have an Apple Computer!"
never knew about based.cooking, i like it
It was made by Kenny's deepfake non-blackface account. The tendies from the tendie video are on there.
@@xerneastrainer8111 i noticed that, actually
@WolframaticAlpha they're the same person...deep fake technology
@@xerneastrainer8111 Are you joking? I'm still relatively new to the Mental Outlaw -fandom- *fraternity* , so I can't tell if this is a joke or not.
@@InventorZahran it is in fact true, if you were wondering
As of this morning I was looking into changing my MAC address to avoid wifi bandwidth limitations at the hotel I’m staying in. Always feel like this dude be spying on me lol always making pertinent content
Man I loved User Friendly way back when people still read webcomics [sound of monster ultra white being opened]
2:27 that's an extremely satisfying IP Address ngl
we're so limited to those IP addresses
yep and his real ip is right below in the first search results description ^^
@@alexander3293 lol I see it now
@@alexander3293 I'm pretty sure that's the IP of the crawler
@@monkemode8128 damn you're right, i completely didm't thaught about that
Your editing has gotten alot better (arch btw)
Informative and helpful video as always c:
used to change my MAC address on my chromebook through croot so then i could evade my child safety timer on the internet LMAO
Genious!
@@michielw.8101 in the end i did end up showing them what i was doing and how i could do this across my main devices and they turned it off cause they gave up with me.
ROFL.
@@tokisuno well that's good at least. rather than taking away the chromebook lol
@@username-du2er yeah i wasnt a very good kid cause i would try to find workarounds to what my parents would do to punish me. at least it made me who i am :D.
Certain varieties of network adaptors have been known to have defects causing the MAC address to all be the same, meaning that if you use more than one on the same LAN they fail to work.
thanks for the video! I'm retaking the CCNA courses and I rather have this topics explained verbally than on the platform
Never knew it stood for "Media Acces Control Adress"! Pretty cool stuff! Also, I think I heard you doing some pentesting basics, please do some tutorials, even if its basic!!!
Wait till you hear what ping stands for
@@ultraviolet.catastrophe for real?
@@awndolznmowdlzkwndznwua grab a book and start reading
tryhackme.com has some pretty well made interactive lessons aimed at beginning pentesters. one of the earlier ones iirc goes over networking.
Thank you for saving me from having to learn this from Google's diverse robot teachers. You know how to keep things interesting
Good street address analogy. I live with someone who has the same first and last name as me.. and it’s extremely easy to mix up our mail
Thank you very much for this information!
Very informative, thank you!
Fun trick if there's a wifi network that you can connect to but are required to sign into (like a hotel's wifi) you can connect then see the other connected devices mac's and copy their mac's and make it your own you then have access to the network (in most cases)
You just need to wait till the device with that mac address is way from the network.
I was wondering when you were gonna talk about MAC addresses. Nice video keep it up pump some more privacy and security related videos, I like them atleast. Thanks.
great video, nice references
Very well explained, I loved it !
I really appreciate your videos.
This was really helpful thanks
Yo Mental, you planning on discussing the Steam Deck? I wanna hear your take on it.
yeah especially steam os. A linux based operating system that can run almost any steam game? sounds awesome!
@@gentoouser4361 yes thanks to the cooperation with Proton! We might see Steam pretty much fully port windows games to Linux because of the Steam Deck :D
Proton is pretty much running everything I throw at it these days. Only exceptions I've found are games using anti-cheat which is to be expected, or games that were terribly optimized in the first place like Quake Champions.
@@Milchjaeger when they fix the anticheat problem i will switch fully to linux
@@nicolascossio5961 They literally can't.
* Anti-cheat detects changed libraries as hacked
* Proton can't use non-modified libraries for two reasons:
1. Most libraries are closed source so Proton devs (mostly WINE devs) should make a very close replica of those libraries
2. Those libraries works with Windows. To make them work on Linux - they must be modified
wow, Gentooland. I would like to go there some day.
great video thanks
Great video,really helpful
Useful video, ty :)
Your thumbnails are amazing!
Finally, you're back. I missed my daily dose of mental outlaw
Nice video please, keep making videos explaining networking
MAC adresses don't really have anything to do with NAT. MAC is a data link layer (L2) protocol, while NAT utilizes protocols on the network layer (L3) and transport layer (L4). Typically your router will replace the source IP address of outgoing packages with the routers external IP address. To keep track of where to send responses it maintains a table of which TCP/UDP port was used in the outbound connection. It then replaces the destination address of incoming package according to that table.
Yes, as far as the ISP is concerned the router is a single Link MAC regardless of if NAT is used or not.
He (MO) was trying to explain in a very beginner friendly way how NICs only have to be unique within one link/LAN domain… NAT may help some understand this concept while it technically is unrelated, confuses the subject and arguable is unhelpful :-)
A cultured man I see, I subscribed to a cultured man hehee
Seems strange to have an entire video about MAC addresses without even mentioning the MAC randomisation used in Android. An Android phone will still have the burned-in vendor-assigned MAC address for its wifi, but, instead of using this, by default Android will assign a random MAC address when connecting to wifi, for privacy purposes. You can disable this, and may need to if you lock down your network to only allow a particular set of addresses.
Yeah, static DHCP doesn't work if you randomize the MAC address, but thankfully you can turn it off based on a per-network basis. It's also on by default on any new network you connect to as well so you can't "forget" to randomize your MAC address.
does android not allow randomization per network? So every time you connect to a new network, you get a randomized address, but it will persist for the next time you connect
@@sohn7767 I believe that's how it works, yes
3:07 card crusher reference, niiiice!
Thank you mr outlaw, very based
Too based under the current zeitgeist
Thumbnails awesome
unrelated question: what do you think of SerenityOS? The videos of it have been flooding my recommended, so I was curious what you think.
Damn this channel is great!
Nice
Awesome. Plus today is Friday, we need to do another hitman level.
Can you make a video just talking about cool useful website like based cooking I didn't know it existed until now and it's extremely useful.
great vid, actually learned something new
based.cooking crossover reference!
Mega based fren.
more cooking videos please been eating tuna sandwhich and meatballs for over a month need more meals to make
I wonder if Mental would ever review AmogOS, the sussiest linux distro in existance!
PLEASE
sussy baka
Pc version of amogos is only debian with amogus rice 😢
Hey Mental Outlaw, do you have any CZcams channels you would recommend to someone who was wanting to further their understanding on Linux? Imo you are top dog for Linux videos, but I was hoping to hear what you think would be some high-quality Linux content since you are a Linux guru. Thank you for your time man I love all of your videos they have taught me so much and made me a better person. Have a good day
Learn Linux TV
You can check out his second channel, called Luke Smith.
Maybe in a next video you could react to "Freedom Phone" it is really funny.
wasnt there a video about being internet private that came out after this vid? did it get removed?
Based
More vids like this for network plebs plz
I was waiting for the the bit the you would show us how to change our social security number
Wait, so does the router check the port or the mac adress of the local device when it wants to send it data?
Faster explanation: Mac Address is a channel on CZcams by the Linus Media Group that focuses on that other OS-that-must-not-be-named. /j
BT has a similar thing to those Xfinity WiFi hotspots but you have to pay for them
Daekwon, i caught that startup reference
Will you talk about the regressive server side public license (sspl) and how it destroyed elastic search? And how AWS managed to fund a fork project under the name of opensearch? And does someone know is there a fork of Mongodb or not?
Next, you should make a video on Exherbo Linux.
what if i keep changing the mac adress until its same as other person have? can i receive some sensitive data then??? or its not working in that way
Based.cooking is where it's at
perfect website Segway
I remember something from uni
That Mac address could have 3 types
Unicast,multicast and Broadcast
Broadcast Mac being FF:FF:FF:FF:FF:FF if i remember correctly
MAC collision on the same network is not as bad as you might think and would only affect DHCP because nowadays the MAC is not used for pretty much anything else. A smart enough router would also reject your DHCP request if there's already an active device on the network with the same MAC, but I guess it could be "hackable" by how the "active" device is determined. Even so, the worst consequence of this is an internal IP collision and all major OSes can detect this (Windows won't let you on the network if your IP is already taken). So unless you do some MITM-like network manipulation, there won't be scrambled packages floating around. And if you happen to have a MAC collision without any malicious intention and no easy way to spoof a different MAC, just manually set different IP addresses and the NAT will work just fine.
He has returned.
Will there be a video on recent Pegasus stuff?
Make a video on Matrix!!
need to somehow change MAC addresses on several different devices that are all on the same network in a very crowded area. that would be pretty wild.
And everyone are ignoring how his ip address says that he is in GENTOOland, Antartica.
its a great day when mental outlaw makes a video
Do video on Systemd vs Openrc.
Hey kenny what kind of mayonnaise do you recommend
Get the olive oil mayonnaise. Many are soybean oil, and some are canola oil. Soybean oil is obvious why you should avoid, but canola oil is motor oil and you shouldn't put it in your body either
learnt alot keep going man
Thanks for making my morning better again! I have to eat cereal without milk now >:\
Nearly choked on soda at the based.cooking reference.
1:35 an odd detour - ipv4 and NAT and all that. Could have just said that ethernet has its own addressing method.
2:43 another confusing bit, it seems like you were trying to explain two separate things but they got mixed together.
As to "how does the NATing router know where to send data", it uses one of its ports, the destination ip, and the destination port, to effectively have 64 bits to uniquely identify the sender-receiver pair of a connection. For the inbound direction, a single ipv4 host can expose 2^16 services via NAT, each supporting up to 2^16 connections from each other ip4 host, again for 2^64 possible connections total. Furthermore, there are 1-2 extra bits to be had by also distinguishing the protocol (TCP, UDP, SCTP, ...) of the connection.
huawei phones have random mac as an option in wifi settings (on by default)
did you get a sponsor from Luke?
Do I need to change the Mac address for privacy even when using Tails?
Disclaimer: I do not know what I am talking about.
I’m not sure quite what Tails does, (perhaps it automatically changes its MAC address already? I wouldn’t know.) but if it e.g. passes all of its traffic through Tor, but without changing the MAC address it uses to connect to the networks, then if you were using it at different networks controlled by the same group, they would, I think, be able to determine that the same machine was used on the different networks, at the given times, using Tor, though not what was being connected to through Tor of course. If they can determine that Tor was used at a particular one of those times, and probably from a particular one of those locations, and that only one computer on that network was using Tor at the time, then they could therefore also determine that the same computer was being used (presumably by the same person) on those other networks at those other times.
That sounds like it could be useful information in identifying someone.
But, if Tails already sets your MAC address in the right privacy-preserving way (which, it sounds like it probably should?) then that probably would resolve the issue.
But, again, I don’t know what I’m talking about. I’m just trying to reason through the possibilities.
Lol that DHCP image
thank you i did not even know what Rule34 was 🤣
post more explained videos!
Yo I even have a Pixel AND a Playstation :o
love the based.cooking inclusion
Gentooland, Antarctica. I knew it.
Gentooland, Antartica
Slowly unraveling the terms of service one video at a time
Great explanation, but now I’m wondering. If the internal network uses MAC address for routing, then why do we even need internal IP addresses?
to access servers on your local network via browser. for me at least
MAC Address is how Tim Cook accesses your cookies. The Tim Cookies.
In 5 seconds I learn something new. I always thought MAC was short for machine, never knew it was an acronym
Oh.
According to this logic, having the same MAC address for your device and a router is okay then, right? I remember setting them as such because that was used to authorize internet access by my ISP; since the router doesn't distribute data to itself, there's no confusion.
There is a decent change you're going to have a bad time if you do that.
It comes down to the specifics of the hardware and software you are using on what will happen.
Maybe your (cheap) router internally is actually a System-On-a-Chip running some router OS sitting behind an ethernet switch chip. In that case the switch subsystem is probably only going to consider the MAC address.
Maybe your (expensive) router is a more sophisticated model where each ethernet port is directly connected to a network interface instead, letting the router parts of the router handle everything and so be able to detect and remedy MAC misconfigurations.
Have fun experimenting.
If you want to see results of the samy addresses, look movie brilliant soviet movie "Irony of Fate"
What about using 2 static IPs? That way the packet is redirected to the ip instead of getting a mac address attached to an ip in the router.
MACs are LAN or Link level only.
- So two IPs on your router will only show up as one or two router MACs to your ISP. (Your computer MAC is never exposed on the router-ISP link)
- So two IPs on your computer will only show up as one MAC on your LAN.
Basically it is just an address on your LAN/Link and each MAC can carry one or several IPs.
IPV4 ARP or IPV6 Neighbor Discovery let’s you find the MAC of a local IP address. Basically you just broadcast “Who has 1.2.3.4?” and someone will reply “00:11:22:33:44:55 has 1.2.3.4”. Now you have a MAC address so you can send the IP packet inside an Ethernet/WiFi packet.
All external IPs on your LAN will have your routers gateway MAC as they do not originate from a local computer (they are sent by the router).
@@randomgeocacher oh... Thank you. Specially for the detail and explanation. 😃
How to learn networks as a beginner ?
based.cooking