Configuring DHCP using Cisco iOS - DHCP Server & DHCP Helper

[@cda9140]

Loved the pacing of the video, efficient explanation of how to setup DHCP server. Thanks!

[@peterk917]

That was exactly what I was looking for, thank you! Most videos I've seen don't utilize multiple pools to make sense of how different networks grab leases from different pools.

[@TheSilentflight]

Not gunna lie. I've been learning ccna for the last 5 weeks, and your videos helped A TON. Thank you so much.

[@LearnTechTraining]

Sure thing! Be sure to subscribe. More will be coming. After I retire courses I sell, I start throwing them up on here. I also take a lot of frequently asked questions from students in my online and in class courses and post them here. Good luck with your continued studies!

[@mosasa1307]

Hey man I hope you read this comment... you posted this 4 years ago... did you get your CCNA?

[@williamcattr267]

YES!!!! Someone who actually speaks English (and without an accent)! This fact all on its own is worth a thumbs up!

[@Odim65]

by far the nicest and quickest vid on Dhcp

[@diegoalfredoarandaherrera3074]

Thank you. I don´t speak english very well (in fact, I have english classes more late), but I have to say "thanks". I have an exam about cisco packet tracer in 60 min and your video saved me. Thank you so much :,)

[@MrFmontero]

Wow Thanks Keith! several different DHCP scenarios all in one video. awesome. I got your Udemy video, haven't started it yet finishing another class, but if this is any indicator of the lessons, I'm already hooked and happy. :)

[@macyeeterson1782]

You are the bees knees man I’m new to Cisco and your videos help me a ton!!

[@MrAlexizhukov]

Excellent. Exactly what I was looking and very professionally made. Thanks!

[@shiori43]

Thaaaankkk youuu!!! You helped me to finish my HW, I didn't know ip helper command so the DHCP server never distributed the IPs to the Vlan, now it does! Also, explaining multiple cases is very helpful!!

[@120smk]

Very informative video. I recommend any one to see this video for all DHCP scenarios. Thanks for your effort .

[@LearnTechTraining]

Thank you soliman - keeps your eyes open for more!

[@976shark]

Thank you for taking the time to put all this together....

[@tracyannegriffinmanning387]

Best training site ever! Thank you, Keith!!

[@LearnTechTraining]

Awh thanks, Tracy! Much appreciated!

[@baconatorman3770]

This was so helpful thank you. Your second example is exactly what I needed for my network in Packet Tracer!

[@brianpmcg]

Great video! Quick and to the point, thanks for showing different options. Instant sub!

[@steliostsotras9050]

Thank you very much!! Excellent video from an excellent teacher!!!

[@MsHardland]

Excellent. Thank your sir! it was to the point. you should also add 5th topology as well. which more kinda real environment. Dedicated DHCP Server>Router>Switch>end-users. thanks!

[@FoysalGoniChowdhury]

I am surprised help me for study lesson DHCP Server, Thank you very much.

[@alvaanezier3130]

this helped me out so much thank youuuuuuu

[@kacperp5517]

koksem jesteś, nie zmieniaj się

[@matmcpaul9060]

Great video. Makes understanding DHCP easy.

[@eyadbassam7756]

You are a good teacher and the best

[@LearnTechTraining]

Thanks Eyad. If you havnt done so yet please subscribe and turn on notifications. We will be launching a lot of Cisco CCNA, Cisco CCNA Security and CompTia Net+ content starting in January!

[@xibu5576]

Man i had this fking shit homework. i literally searched how to do the last one for like 4 days and finally found you ty so fking much man

[@aminaqx]

THANK YOU, YOU'RE AN ABSOLUTE LIFE SAVER!!

[@patrickbrice7830]

Thank you for this wonderful lesson. DHCP is working fine. How do I send packet across the two subnets?

[@HamdanALGhafri]

Thank so much just what I need to learn DHCP. with best wishes

[@Vasco947]

thank you so much man. You saved my life

[@wildertorres7501]

Thank you very much, this video helped me a lot Excelente esta en ingles pero entendi perfectamente el procedimiento que realizaste de nuevo muchas gracias.

[@paulmimicry9147]

THANK YOU, JUST WHAT I NEED

[@petersu4869]

my right ear is very well informed

[@petersu4869]

my bad, my shit earphones lol, vid is fine

[@tak-ada]

This is the best video ever!

[@a.q118]

Thank you and please don't stop shearing veds

[@TorontoVeganTravellers]

It's interesting to see the first example, the only thing configured on the router was DHCP on both sides of the router interface. I was suspecting that since there is no routing protocol, the ping would stop at one side of the router interface and not allow to ping through, however I was wrong. I did the example myself and discovered that I could ping the other computer with just DHCP setup on both sides. Usually a router will prevent different networks communicating without a routing protocol?

[@LearnTechTraining]

A router knows of its directly connected routes and therefor will know how to transmit that data to another network. If you did a “show ip route” you will see the different networks in the routing table. It will use that information to determine where to forward the packets You only need to use routing protocols when communicating to different routers neighboring each other.

[@TorontoVeganTravellers]

@@LearnTechTraining Thank you! :)

[@kbaudewyns7]

Very good thank you although a little fast near the end haha : D

[@brendastoicy3242]

Thank you very much for this tutorial

[@bestlososever1869]

Man, you are God. Thank you so much, keep up with the good work! ;)

[@szabolcskovacs8071]

Excellent help, thank you very much :)

[@trendingeverything7854]

Good explanation

[@danielnyayarkarjr3378]

What are the command you can used for static routine protocol.

[@hectorcardenas6616]

in the last configuration having just the server and the switch, you can have dhcp configured for all 3 computers without the need for the router configuration.

[@mangkepweng8670]

Thanks....... Complete tutorial........

[@gokulprasanth9517]

This was so helpful thank you

[@bowchicabowwow467]

I noticed on your 2nd network you made. The first set of PCs cannot find the default gateway while the 2nd set of PCs can. I am also trying to troubleshoot that so both networks can talk to each other but so far I am hitting a wall.

[@doubleromans4916]

Same problem here,did you found the problem?

[@ronniekipkirui]

Nice piece thumbs up and kudos

[@mjb1552]

Thanks 👍😊 Keith.

[@kike_jrp]

Great video, thank you very much!

[@zglitch4021]

Has the info i need.. Kind of Currently doing a Networking class and trying to figure out why my FHCP server wont extend past the router. Have not done any training for the CLI yet, so I'm trying to to interpret the reasons of the IP's entered.

[@AhmedSamir-nd2cz]

Very Nice

[@amarananamaranan5287]

is it possible to connect the dedicated dhcp server to the router to distribute the ip addresses? DHCP Server -> router -> switch -> PCs

[@rojenabuyen1365]

tried the first one, it works but can you help me add another network. I have 1 server connected to 1 switch and 2 routers are connected to that switch the 1st router receives the ip but the 3rd one doesnt. Any ideas? Thanks

[@LearnTechTraining]

I might be mis understanding you, but the way I’m reading this isn’t making sense. 1 server. 1 switch. 2 routers... where is this 3rd router coming in? Is this a physical network or packet tracer? If it’s physical network draw out a diagram, or if it’s packet tracer take a screen shot of your topology and email [e-mail] and I can take a better look.

[@user-lo3bq5py1h]

You need to configure the IP helper address on the 3rd Router you added.

[@CriticalzDetucora]

Muy interesante, gracias me ayudaste mucho.

[@MrPotato948]

in third scenario, do we need to put ip address of the router on the fa0/0 because i dont see u do it.

[@normalguyize]

in the third example is it necessary to configure the routers for a DHCP relay? If yes, what should you set up?

[@LearnTechTraining]

Hi Jim, third example - so if your looking at the bottom left network, yes you need to add DHCP relay to the router due to the fact we have multiple networks that are pulling from the physical DHCP server. If you are referring to the bottom right example than no you do not need dhcp relay since the router itself is acting as the dhcp server.

[@normalguyize]

thanks, but what about the switches. Same question for third and bottom right example.

[@LearnTechTraining]

If you implement DHCP on the router than you don’t need to for the switches. They are working because we have a trunk link. Since we have sub interfaces using dot1q and we created a dhcp pool to each network for the vlans, the router knows where to send the traffic through the one interface which does not require ip helper

[@a.n.7338]

@@LearnTechTraining in 2nd example pcs are not getting default gateway why is that?

[@BeeBumper]

Is there any scenario where the Default-router would be something other than the default-gateway? I saw someone do this when teaching dhcp and I always thought it had to be the gateway but they used some other address. It still worked and that kind of made sense as you define the network and mask using the network command in DHCP-Config mode, which makes me ask why would you need the default-gateway since the range of addresses is defined. I guess it depends on how the DHCP server determine the NW that the request is coming from, but if it had to do with the defined default-router I would expect putting another address other than the default-gateway would cause a failed attempt. When he did this it didn't fail, it worked like it always does. I will be going back to that lecture so perhaps I can give more detail but off the top of your head is there any scenario this might be the case?

[@BeeBumper]

I also noticed you didn't use the "Service DHCP" command, is it on by default? This would be the first step I would think to enable the dhcp service.

[@BeeBumper]

Very easy to understand for sure so thank you for that but sorry man the fact you put a helper address on both router interfaces confuses me. I understand how and what we are doing but I don't get one aspect. It works simply by having the 2 dot 1 interface having a helper address why would you need one on the 1 dot 1 interface as it works for the 1 dot 0 network without it and it doesn't add anything to the 2 dot 0 network getting an address. I did it with only adding the ip helper-address to the 2 dot 1 interface and it works fine. You also showed any device on the 1 dot 0- nw can get an ip address as soon as you configure the services dhcp pool. No helper address required. Is there a scenario that it does come into play?

[@islamiclifeandearth]

very nice bro

[@BaronHnid]

You saved my grade in school thanks ;)

[@SANTOSHSHRESTHA111]

when using the iphelper address , aren't we supposed to use ip helper-address on fa0/1 ???? ... PS: i have 3 routers.. and dhcp only worked when i used ip helper address on the port facing towards the LAN side

[@drgrockster]

ok had to renew the pc addresses a couple of times it's working now

[@remihoarau5091]

Hello, on the second example, the PCs from the left have no default gateway... so we can't ping the PCs from the right... Can you tell me why ? And how to enable default gateway ? Thank you

[@hessa4114]

did you get it? because i'm facing the exact same thing right now.

[@Brianmeneer]

@@hessa4114 Same here, struggling with it. Did you get an answer from somewhere?

[@hessa4114]

@@Brianmeneer yes, okay so you should give the (server pool) a gateway and then assign the devices to dhcp, it should work.

[@matejfele9971]

@@hessa4114 Thanks, that's true!

[@FAHADKHAN-hw7mn]

​@@hessa4114thank you so much ❤

[@johnreycasipong4916]

Hi i have server connected to switch and 2 router connected to that switch and 2 switch again connected to my router and end devices. But when i followed your instruction only the left end devices succeeded in dhcp but the othet is not

[@EduardoLima-pi7fl]

I have the same problem here, did you already solve it?

[@johnreycasipong4916]

Eduardo Lima try turn off and turn on the dhcp server again. If not go to the router ports. Off and on it then fastforward

[@EduardoLima-pi7fl]

@@johnreycasipong4916I tried it, but i can't get the DHCP server to work no the right side, I think I'm missing some router configuration

[@johnreycasipong4916]

Eduardo Lima your router 0/0 port ip is the gateway of your server then the 0/1 port ip is the one that you put inside the dhcp server then in the 0/1 port use ip helper with the ip of your dhcp server

[@EduardoLima-pi7fl]

@@johnreycasipong4916 So there's no need to use the IP helper in the gateway??

[@ryanwellmer9297]

Very Informative and helpful! I do have a question about the second example you go over. I was wondering why the PCs in the 192.168.1.0 network did not learn default gateways from the server like the 192.168.2.0 network side did? I can't seem to get a working ping between the two halfs without that DGW.

[@krg3604]

Ryan Wellmer hey Ryan - as awesome as Packet tracer is, it sometimes does weird things. Not that it’ll hinder your studies, definitely keep using it. Packet tracer likes one network to use the “serverPool” name inside of the server and dhcp. So try deleting dotOne pool we create. And then click server pool fill in the same address information and slick save. Go back to the laptop and click static and toggle back to dhcp and it should work for you

[@krg3604]

Let me write that a little more clearly - 1.) click dhcp server > services > dhcp 2.) delete “dotOneNetwork” we created 3.) click the default “serverPool” and fill in the same information for the 192.168.1.0/24 network. > Click Save 4.) go back to laptop > desktop > ip configuration > toggle between dhcp/static and then go back to DHCP and that should work. Little bug that sometimes causes this to happen.

[@84follow]

I had the same problem but this solution helped me! THX!! Great video Btw!

[@kaushalpatel6638]

Hi Keith, Thanks for this nice video i have same problem of ping and gateway. I tried with your provided solution. It does not work. Furthermore, i found in your video that gateway is not there. Please help in this solution.

[@chsene8214]

got the same 2 issues on scenario 2 and no fix with my latest PT though...so disappointing!

[@ahmadasghar7193]

Hi mate it helped me alot Cheers I have one question If router is acting as a server(case 1) How can we limit the numer of users on one network ?

[@theonewhonevergaveup785]

very professional

[@digitaltechnical2691]

The two networks utilizing each router port are each their own broadcast domain so is there a method for relaying dhcp between routers without using a dedicated dhcp server?

[@LearnTechTraining]

You need some kind of device to act as a DHCP server, being a dedicated server or a router configured to at as a dhcp server, so if thats what you mean than yes absolutely, its all done by using the DHCP Helper or relay command. Depending on how the network is set up, there may be some more detailed configurations one would implement but at its basic understanding, you would just use the DHCP helper. That will tell the router that it needs to pull DHCP from the DHCP Server ( or router essentially) and then it will hand out the addresses you configured for that subnet.

[@digitaltechnical2691]

Sorry for being unclear. I mean between two routers where one of the routers is configured with dhcp. I understand how helper addresses work but the packets are being dropped on the adjacent router.

[@H0TDigidy]

Would there be a different process if I want to just use a layer 3 switch and some host?

[@LearnTechTraining]

Short answer is yes, but every network fabric and topology is different. Depends how your building your network. In something like this, yes you can.

[@mohamedhossam708]

thank you for your effort.

[@akbdipu7586]

Is it possible to use pc as server and configure DNS?

[@Paasj]

God stuff! Thank you :D

[@bayuwibawa436]

can it intervlan routing but dhcp in server ? with 2 vlan ( vlan 5, vlan 10)

[@louiealbarico2784]

Nice tutorial! I have a question about the last scenario, considering the Server is on a different VLAN and different Network (ex. fa0/2 is on VLAN 50 with 192.168.5.0 Network), is it possible that the Server will still be able to give IP addresses to the other VLANS(10,20,30)? I'm just curious.

[@krg3604]

Sure. The last example goes through this. As long as you have a DHCP pool configured on the server for each vlan, you will then use the ip helper command on each of the sub interfaces on the router.

[@nm2064]

I just did it and it worked. My servers are on VLAN50 and the rest of the boxes on different VLANs. I just did not create a pool for VLAN 50 as I want the servers with static addresses.

[@azazel_1167]

Hey im learning and i have a question that confuses me if any one could answer that would be much appreciated. I have a dhcp server and it works correctly, as i was able to give pc a dhcp address. I also have a wireless router on the network and 3 laptops are connected to it wirelessly. I have the dhcp service off on the router and im confused why the server isnt giving a dhcp address to the 3 laptops. Shouldnt it give them one because it is connected to the server?

[@everythingispossiblecz2445]

Thank you very much.

[@akashprasad8168]

On last one Server need vlan 10 ?

[@classix5848]

god bless your soul

[@CanecaProductions]

Why do you selected native for vlan 40? What does native do?

[@LearnTechTraining]

Native vlan is for untagged traffic. Common for devices that do not support tagging of traffic, it still needs a way to traverse the trunk link so the switches or routers will place it in a native vlan. We don’t ever want to leave the native vlan default to 1 simply for security reasons. Best practice is to change the default vlan to anything but vlan 1, and also move all ports out of vlan 1 since again it is default.

[@CanecaProductions]

Appreciate the reply Keith. ! I will sign in on your ICND1 Udemy course.

[@naifox1]

Excenlent tutorial. But VTP is missing to control de Vlans

[@LearnTechTraining]

VTP is bad practice and not recommended even by Cisco. You won’t use it in the real world. Throw it in transparent and manage the network properly.

[@sarmadghafoor8215]

Hello, Can we use DHCP relay agent for Wifi Network? if yes then how? Because Wifi Access Points do not support dhcp helper . Can you tell me any cisco router which can be used as Wifi AP and also supports DHCP helper.

[@joshuabarbosa4824]

I'm not an expert at this, but I don't think the access points themselves need to be assigned IP addresses. It's the devices that are ATTACHED to the AP that need to be configured with IP addresses. But again, I could be wrong.

[@poise8702]

it is assigning the defaul tip to first pc instead in pool i mentioned starting ip would be from 1.3

[@sorinpaduret6775]

THANK YOU MAN

[@jtgamesnl4808]

you use DHCP in the first example. I do not want to use DHCP but a static ip. how can I connect that between the separate PC and the PC with the switch in between. I only want cables I don't wanna use a wireless connection.

[@shirazi_khan]

Thanks a lot great video

[@lordnoobster]

why did pc-4 acquire the ip address of the default gateway?

[@CaNaOfficial68]

thank you so much!

[@ישראל-צ5ה]

I did everything like your video (the last example) and the server doesn't give me addresses for any VLAN I get APIPA

[@ישראל-צ5ה]

I found my mistake, excellent job.

[@arijitnaha4769]

for 4th scenario, it is failing to get address from DHCP. I did same configuration but still it is failing. An idea why?

[@LearnTechTraining]

I can’t answer since I don’t know what you configure. Keep trying and message me privately with any further issues

[@jacob7285]

@@LearnTechTraining same here the switch isn't even talking to my router... cdp neighbors sees it, uplinks is trunked. access port is SP access....Why did you make a VLAN40?

[@antoniostelio5020]

Hallo, the second LAN the DHCP Server doesnt give the default gateway end the first PC on the Same Network took the address of the Server any one cann solve my doubt??

[@tiltyler4056]

how can i do it if i am using an etherswitch router with two vlans

[@KingCruzer]

I hope you're still active..... can you make a vid about 1 DHCP server connected to a switch and the switch has 2 routers connecting to it? please, I'm dying to know and learn about this one (if this is possible), because I tried doing it but only one router gets the IP from the DCHP server, the other one was assigned by the APIPA. Thank you in advance!!!

[@subhendutarafdar6815]

Was looking for application of show ip route and ip helper address.

[@cabecitavides]

Hi , First of all, THANK YOU, finally i am able to do DHCP at least on Packet tracer. One thing that i noticed that in your video as well as when i tried it at home, i noticed on sample two, this is the one where you add the dchp server without vlan. The dhcp server gave the addresses to the hosts but i don't see them getting the default gateway info. Can you please explain why? it occurs on my sample that i followed from you as well as in your presentation.

[@SANTOSHSHRESTHA111]

Thanks😀

[@highlights973]

amazing

[@mh63111]

Thanks a lot brother, I need to know: how to configure (lease time) on DHCP router?

[@LearnTechTraining]

Under your router DHCP configuration mode: Router(dhcp-config)# lease {days [hours][minutes] | infinite}

[@sandeepnainwal13]

nice video..could you please help me setting up cisco ips in gns3

[@alexmason7393]

In the last example, I did exactly what he did at the start before configuring the router but when I switch to dhcp on pc, it didn't get ip from dhcp server, wierd

[@estebangonzalezgomez3581]

ur the best

[@hasanalbanna1600]

nice

[@t00nlegend51]

How can the PC on another router get the IP from DHCP Server without VLAN ?