DHCP: How Your PC Gets Its IP Address

[@jibin7277]

Better than reading 1 whole text book !!!

[@slidenerd]

dude, bloody awesome! as Einstein says, you can simplify it if you understand it, that was totally badass

[@BLBytes]

My Cisco course taught that the messages were: DHCP Discover - Broadcast DHCP Offer - Unicast DCHP Request - Broadcast DHCP ACK - Unicast The server can send unicast messages because it knows the MAC address of the client from the original discover frame sent out. Since DHCP will only really happen on a local network (with exceptions) it doesn't need to know the IP address of the client, only the MAC. The client broadcasts the request so that if there are other DHCP servers on the network, they can see the request too. Only the server that made the offer will ACK the request.

[@bekcekcingnaknyet1382]

tru dat, but then the grandmas don't need to know the whole cisco system, the video has done its job of stopping the regular questions of some grandmas with slippery fingers "why these numbers keep on changing?"

[@ApexSpeedster]

yes u r correct.

[@raydenross477]

That is true grandmas don't but networking students looking to study subject matter do. It seems as though we catch it anyway so I digress

[@slokaroy4430]

It is because of ARP(Address Resolution Protocol) Reverse-ARP in the cache provided by the server.

[@ajaytamang5957]

Pieter you the best man when it comes to explaining the technical stuffs in simple language.

[@h-batchmailadmin5958]

Its the best video with excellent explanation i've known so far ! Thankyou sir !

[@paleshyrain]

more videos please. youre doing a great job! better and simpler explanation than the ones given by my professors in college.

[@MrSaemichlaus]

These videos are a pleasure to watch! Superior design and clear words, very well done.

[@razpet20]

Cmon Pieter, thousands of computer science students depend on you making more videos, for finishing their course! :D

[@konradlubaszka3769]

Another great entry describing the principle of operation of these complicated things. I really like your simple explanation that can be easily understood by people who are taking the first steps in networks. Did you could make a video in which you could explain the principle of DAS , NAS and SAN on some examples? This would help me a lot

[@seetsamolapo5600]

-DHCP server typically inbuilt in a router and a DHCP client in built in each host - When a new host is added to a network it goes through a DHCP discover process, looking for a DHCP server. Since the host doesn't know where the server is it will send a discover request (broadcasting) to all devices on the local network. Port 68 - DHCP clients, port 67 - DHCP servers - The DHCP server then responds by sending a broadcast of an allocated/offered IP addresses to all hosts. Since the server doesn't know where to find this new host it sends the DHCP offer to everyone

[@jgwood89]

maaaaaaan come BACK!

[@DaBBoSaH]

your style is really nice, please don't stop, keep it up

[@Drew.DrivesYT]

Just remember DORA and you'll never get confused.

[@peachapple960]

Ozma2112 Man! You're a genius! You've just saved me for my exam! Thank you!

[@oranjizer]

One of the best, very well explained videos on the concept.

[@sourabhsomdeve1373]

Bro how easily you explain this.....i definitely show this video to my teacher and tell him to explain in this way......

[@nishadkumar7322]

And the emmy award for making things simple to understand goes to YOU!! Great video!!!

[@Gg8YRwnc3e]

Professionally & beautifully done and explained. Thank you. 10/10 :)

[@hakeem4793]

Damn your explaining is so simple and easy to understand. I wonder why don't you upload no more

[@wangyuntong9428]

So clean and simple!!!! I love your illustration ~ Helped me before exam

[@BoomWahDis]

Wow just frigging wow .why doesnt everybody explain it like that,the teacher?😢😢 .God bless you sir , thank you thank you .

[@wliaputs]

Should provide a summary at the end of the video. So here's the summary on how DHCP works: 1)DHCP Discover [ By Client ] (Search for DHCP server) 2)DHCP Offer [ By Server ] (Offering an IP to the requester) 3) DHCP Request [By Client] (Agree with the offer) 4)DHCP Ack [ By Server ] (Acknowledge the agreement, set the offered IP to the requester)

[@tonywang7933]

Thank you so much, to make it so simple and clean. Hard to find anything with this good quality. Don't know why there are down votes

[@andrewlira1537]

The down votes are those who were jealous of Peter's superb videos perhaps. They're in vain lol

[@PotatoChixMoMo]

Mannnnn...u r better than my teacher. 100 times better than a teacher out there

[@recolian]

man you earned 55K subscribers just by uploading 6 or 7 videos. why would you not keep doing this!

[@j7ndominica051]

The network should still used static addresses if possible, to make it organized, except these addreses can be managed from a central table of static leases on the router. It makes sense to give the "laptops" host numbers 1,2,3,4, give the "smart TV" address 17, and let guest "devices" share a pool .128/26 that doesn't overlap with these. Then you can easily put a server on any laptop, or write a firewall rule that restricts the devices as a group. What DHCP enables is to move those portable hosts onto a different network without reconfiguring them manually.

[@youarewelcome2009]

Note: 0 0.0.0 stands for the zero network (local network that is not forwarded by routers). 255.255.255.255 allows all devices connected to the local network to accept UDP datagrams. Before packages become packages (network layer) they are called segments or datagrams. (Depending on which protocol is used on the transport layer, TCP or UDP) DHCP uses UDP as is it a stateless protocol and does not require a connection. Hope this helps.

[@paterson00]

Thanks for creating the video. I need to know this stuff in the future for work as networks become more and more used. I work in the railway and equipment in the field is now communicating like this and I will be left behind if I don't start to learn it. I didn't get everything there but I am starting to understand. The illustrations help a lot

[@UpusCumupus]

hi pieter ..just like to tell you that i really enjoy your videos. They're very informative and easy to understand! Keep up the good work.

[@Trotskisty]

A very clear exposition. Kudos.

[@freeze30able]

ur better than any of my teacher. u explanation is so so good.

[@DanielBuenrostroC]

You saved my life, Thanks!

[@arunhit1993]

i liked this video it clearly explained the doubts i had with DHCP, i dont know what it is. very good presentation.

[@SimplyWreckless]

I have completed the cisco small home and networking course , but I want to do an apprenticeship within networking , but most of the roles involve using windows server. Now I know that dhcp can be set on clients computers to enable them to obtain ip addresses. But say for example the dhcp server is a computer host using windows 2008 server does the ip address of this machine have to be static. And it is a larger business so they use more dhcp servers,

[@_burd.]

I like how the superhero has a butt, but this is a lifesaver. The clearness of the explanation made me understand in an instant and the backstory of everything makes me more interested in the topic. Thanks!

[@applegaming3461]

That was simply superb. May I request you to share similar tutorial on DNS to public?

[@bekcekcingnaknyet1382]

thanks Pieter you're a legend, my grandma really loved how she can finally got it without an argument with me :D

[@junaidtanoli1]

Pieter your videos are awesooooooomeeeeee

[@ayushmalik8317]

reply from DHCP server to client is dependent on the flag if it is set then broadcasting​ is done if reset then unicasting. in Cisco router it is reset by default so reply is generally unicast. Unicasting can be done by using the physical address of the client sent during the request for IP.

[@kirandevkumble6975]

dude u really make a great videos . Your teaching method is really awesome . Dude come on, make some more .Where are you?

[@ankitprajapati3768]

Just one word want to say. Excellent!!!

[@Gazunklenut]

Sometimes the DHCP server will unicast the ACK message if the host is behind a switch using MAC addresses, the switch would then broadcast the message to all connected hosts.

[@amitatray7782]

short and crisp... lovely...

[@zhiyaowang8826]

Excellent videos! Wish you can make more. Like the HTTP request and what happens when we visit a website.

[@thepoojaghosh]

I would like to see a video featuring transmission of packet in a network and how it operated with a swatch and router, also a video featuring transmission of packet through all the osi layers

[@Wizardboz]

maybe its just because I'm ready for the info but this really easy to understand. THank you, im watching all your videos now lol

[@zealeatoire]

I love it. Thank you very much for the videos. 2 ideas maybe for additional videos. Access Control List, Routes Tables?

[@shivanisrivarshini180]

Sir your videos are simple and understandable thanks for your explanation Please make more videos . I want to know about application layer protocols and about stateful protocols in application layer Thank you

[@aragiewube8833]

wow your explanation is accurate and in understandable form!thanks sir...

[@marinakim2929]

Pieter come baaaack, i miss you!

[@kso35]

hello 2021----Wish you could upload more, Pieter. Your content is helpful. Thank you!

[@sriniatiisc]

Pieter. What a nice work you have done in simplifying the tutorial about DHCP. We need more videos like this. Great work.

[@MasEja]

hey,Im Reza from Indonesia. i need you to explain the routing protocols like OSPF,BGP,RIP and EGRP .Thanks for your attention .

[@EddieSundvall]

One thing I'd like to see is of course how data packets are routed through the internet, although I understand its a science field of its own.

[@kikaider003]

Great instructional video please help. Im having an issue with my smart tv. The router connection went down for a few hrs, when it came back I could no longer access my smart tv features such as youtube or the browser. I checked the network on the tv and it says connected, a message also appears saying something about dhcp

[@VishalSharma-gt1hy]

what is the message ?

[@davidkimkan]

I enjoyed this explanation of how DHCP works. Very nice video.

[@TheMooseLP]

I might understoond it wrong but at 3:17 the broadcast sound not reach the second laptop, because the router stops it and divides the network in separate broadcast areas.

[@linkedcvsite7431]

Hey Pieter, thank you so much for this video - it explains the concepts very well and helped me prepare for my upcoming exam! Is there any way to download the presentation slides you used here?

[@meochieng]

Very informative video. Good work, Pieter!

[@abhishekbahuguna1130]

How can a router broadcast the offer and ACK . The use of router is to split the broadcast domain , otherwise what is the benefit of using a router. Just imagine the number of hosts being connected to the network and how much traffic they will generate , and so much unnecessary ACK and Offer will be broadcast to all hosts. It is like unnecessary traffic and will lead to congestion. Once the IP is assigned , hosts can use gratious ARP to validate if IP is unique or not

[@kalpeshss]

Good explanation Pieter. Superb. Easy to understand in common lay mans language with graphical representation. Do u have more vidoes on subnet mask, subnetting or VLSM etc ?

[@victorklimov5254]

perfect explanation!

[@hilaryjansz4687]

Simply Excellent Explanation

[@Atpugtihsrah]

You're great in explaining things! The idea of how the datalink, network and transport layer execute in tandem is still fuzzy in my mind. How the frames, datagrams and messages(segment) are encapsulated in each other? Could you please explain this thing or refer me a good video like this?

[@wolfteamUpdates]

Please make some more videos. You are the best.

[@chrisvillareal7140]

Hi @PieterExplainsTech I watch all of your videos and all of them are very good and well explained. I wonder why you didn't continue to add more videos? I only saw few of them. I hope to watch more of your contents about computer networking. Thanks!

[@Pali051]

Hi Pieter! Is this your real voice? Cos your tone is just hilarious and Kind of exaggerated. But i love it, it entertained me. :D

[@rameshram6875]

when the dhcp server(192.168.1.1) offers new ip address 192.168.1.3 for new host then why new host bradcast the message "dhcp request" on the network without sending only to 192.168.1.1 address who is the dhcp server

[@nikhilnagaraj4113]

Best explanation on net bud.. Subscribed

[@geod6694]

Great job!! Gongrats! You are really good at explaining difficult terms in a very simple way! One Question! Do you have in mind what kind of different offers several servers can offer?

[@sandejai]

I haven't finished watching it, but I am compelled to , thank you :)

[@karthik20121]

Hi Peter, I would like to know the difference b/w 1. Dynamic allocation 2. Static allocation 3. automatic allocation.

[@DuuAlan]

Amazingly explained.

[@adityapandya1572]

Thanks man......it was freaking awesome and so simple too....doing a great job

[@theot58]

Awesome videos - clear, consice and easy to watch.

[@TheKeule33]

Very nicely done and easy to understand. thank you

[@akhilvarghese206]

nice description is simplest way possible. :)

[@SOU6900]

This answers the big question I have with my network which is how the DHCP works on my wireless router since I know I don't have a DHCP server. I'm assuming that a router that is connected to a switch can be used as a DHCP server as well.

[@obinnaomego1971]

very very good. pls can you explain IP addressing and subnet mask

[@VADroidTS555]

Beautiful explanation!

[@wacz016]

In step 3, why does the new computer on the network broadcast the DHPC request to all devices, when it knows the IP adress of the router from the offer it received in step 2?

[@ozanmuyes]

Your tutorials awesome and easy to follow. I would like to watch a video that you explain network topologies. Thanks in advance.

[@manojmohan07]

I want to know since router broadcast the ip to be assigned, how router handles if conflict arises when two device accepts the invitation of the received ip?

[@Alex-mv3ht]

If the offer UDP packet contains the router IP, why does the the host still broadcast the request instead of sending it directly to that IP?

[@redberry8197]

Very good lecture in every way! :-) Thanks!

[@Arihanth1720]

How will a computer know if a particular ip address is on the same network or a different network. How does it find out that using different layers of the osi model

[@B0nztube]

hi how to solve this issue? here's the scenario.. user used laptops, sometimes they can connect.. but there's another time that they didn't. "i have set.up here a dhcp server in clear os and the 2 wifi router is acting now a access point" users laptops is using dhcp but can't have IP address from dhcp server, only the autoconfiguration ipv4 will shown it give IP automatically but a wrong ip. what i do is: restarting the 2 wifi router and restarting the dchp server and i also using putty to restart the service by using this code "sudo service dnsmasq restart" but unsuccessful.

[@divinepath5706]

Please explain why the destination IP address of DHCP dicovers all 1's ???

[@manojg7144]

Hi Pieter, Love your channel... Please explain the differnce between MAC address and IP address.

[@larskinder1138]

Really well explained.

[@rpiian]

I was trying to connect a solar inverter w/dhcp to a switch which was then connected to a modem. The inverter could not pull an IP address from the switch so replaced the switch with a router and voila, the inverter could connect. Obviously this was the addition of a DHCP server. Is it impossible to get an IP address when I connect: Device > Switch > Cable Modem ?

[@claireslater6243]

One of the most common errors it seems is The default Gateway is not available [ this includes me ] but so far and despite countless hours of searching i've yet to come across a fix for this i'm positive thousands [ millions ?:] would be etenally grateful to any one that solved this i know I would

[@ankitprajapati3768]

Plz upload video on why we need both ip and mac addresses. Thanks in advance.

[@charchildudani6675]

Hello Peter.. I like this simple and clear explanation.. could you explain with the packet format ?

[@tayadihyt]

Thank you very much. very clear to people who are new to IT/networking. what is your next project?

[@billyboller9871]

I would like to see you explain frame relay.

[@NikhilJumle]

DHCP very well explained , thanks !

[@AmitSharma-nj2dd]

Awesome for revision purposes

[@SaginaPraj]

Hi Pieter I'm confused with your explanation. I have read that , DHCPOFFER & DHCPACK sent by DHCP server are unicast but you are saying broadcast. Does it make any difference or not?

[@PieterExplainsTech]

According to the DHCP specification (RFC 2131), unicast and broadcast can both be used. You might want to read this: stackoverflow.com/questions/10636699/why-are-dhcp-offer-and-ack-broadcasted

[@SaginaPraj]

Thank you !

[@ponczman]

I am learning CISCO right now. Your videos is ve ry usefull, thankyou :)

[@azar1642]

Superb..Brother make Dhcp relay agent video too.