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Understanding DHCP Relay Agents
November 05, 2013 | By Netmanias (tech@netmanias.com)
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Comments (34)
varun chaudhary 2017-07-26 14:49:18

Awesome article. Haven't seen such a detailed and clear discription of the topic.

Netmanias 2017-07-26 16:43:31

Hi Varun, Thank you for your compliment :-)

rakesh 2017-10-30 03:48:30

super details thanks a  lot for a great article...

vikram 2017-12-08 16:43:04

I ever r seen this much clear explanatioin on dhcp relay agent. Thank you :)

Priyanshu 2017-12-11 20:30:00

This is by far the best explanation i have seen on DHCP.. thank a ton !!!

Jim 2018-03-28 10:59:25

Best article written on DHCP to the date.

Chris Changmo Yoo 2018-03-28 12:17:12

Thank you for your compliment. I'm glad you liked it. 

ranji 2018-06-05 05:57:58

excellent!!! a crystal clear explanation with enormous details... verymuch appreciated... hats off...

megs 2018-06-16 11:37:07

Wonderful article !! Thanks for the insight, it's been helpful in understanding DHCP

Muriel 2018-10-03 03:03:38

The document is pretty helpful! Thanks for sharing such an enormous details article.

Liju Philip 2018-11-09 18:59:01

Excellent document. Very useful.Thanks for sharing

Adel 2018-12-26 07:20:14

good explanation Thanks

Igor 2019-02-05 01:05:34

Very, very gooood. Big Thanks !!!

benjadavid 2019-03-30 03:40:31

omg! this is super work.

ron 2019-04-09 18:29:26

the best i ever seen


thanks !!

jtac 2019-05-14 19:53:01

you did a well job but smothing you need to edit in relp port it should be 67


victor balraj 2019-05-17 18:33:20

wonderful article...Really appriciated..Great Thanks...

Ajith Adapa 2019-07-16 01:28:10

Excellent Article.


Is it possible to know which editing tool you have used to draw such a beautiful detailed explanaions with respect to protocol ?

Chris Yoo 2019-07-24 08:23:49

We mainly use Microsoft Visio as a drawing tool.

Srini 2019-10-11 13:46:32

How does the the relay agent know the DHCP server IP and MAC?

chris 2019-10-15 11:35:32

The DHCP server IP should be configured on relay agent,

but MAC address of the DHCP server does not need to be known by the relay agent.

said 2020-05-22 11:01:57

The source port and destination port used between router and DHCP server must be 67 in both direction.

Vidhun 2020-06-18 15:42:15

Nice work, this gives a good explanation. 

Akhil 2020-06-30 03:16:37

Very informative article !! A quick note though, I think the source port from the relay agent should be 67 itself otherthan 68 whent the relay agent unicasts the packets to the Server. Correct me if i am wrong.

Akhil 2020-06-30 03:18:33

narayanpethabhilash@gmail.com 2020-07-10 13:15:10

Very useful article on DHCP relay agent 

spidy_trench 2020-07-17 16:12:56

I've been surfing internet to get packet level explaination specifially with DHCP Server located on a different network, this is the best explaination I have ever came across.


- Great Job.  I can imagine your efforts and time behind this.


Cheers from Seattle, USA

Massimiliano Sbaraglia 2021-01-24 21:52:12

It is possible to havce the same good lesson about DHCPv6 messages and if it possible understand better the transport between an client with DHCPv6 request over an IPv4 network backbone; the DHCP server is dual-stack ? Thank you too much


Rajneesh Panwar 2021-02-26 13:41:13

Very well explained and easiest way with artifacts.



san 2021-03-25 03:53:44

Wow supper ....

rbhati 2021-05-21 19:23:54

Vice nice explanation.


Can we configure any device except (router/switch) as DHCP relay agent?

If  yes, then can we configure one port as DHCP client and other port as DHCP relay agent on this device (this device neither  a router nor a switch)?  

rmanedi 2022-02-08 06:23:04

wonderful explination

Safal 2022-05-27 12:30:40

Was looking for information on how DHCP identifies it came from which subnet? Nice Explaination. Thanks for taking time and efforts.

rahul 2023-05-25 17:02:24

really nice content

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