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Explain DHCP DORA process?

Updated on October 2, 2010

DORA PROCESS

 

DISCOVER:When a client is configured with the ip setting to obtain Ip address automatically. Then the client will search for DHCP server and the UDP Broadcast to the server about the DHCP discover

OFFER: DHCP Server will offers a scope of ip address available in the pool.

REQUEST: In response to the offer, the Client will requests for an ip address.

ACKNOWLEDGE:In response to the request, server will responds with all Ip address, Mask, Gty, Dns and wins info along with the acknowledgment packet.

Anyone has some more suggestion. You can update it.

Thanks

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    • profile image

      natique ali 4 years ago

      fantastic its to good

    • profile image

      Shankar 4 years ago

      Still needs to discover more

    • karthickjck profile image
      Author

      karthickjck 4 years ago from Bangalore

      Its not an acknowledgment for the UDP packet but the acknowledge of the requested IP.

    • profile image

      Nazim 5 years ago

      Dear Karthick,

      If DHCP work on UDP protocol so why send an acknowledgment as per topology of UDP its not send any type of acknowledgment. Please suggest the same.

    • profile image

      Bhaskar Dixit 5 years ago

      Dear Karthik.

      can you tell me please. what is the inside of Discover, offer, request aknowledge

    • profile image

      bhavne 5 years ago

      dw2ed2we 3ref3rf

    • karthickjck profile image
      Author

      karthickjck 5 years ago from Bangalore

      ARP protocol is a protocol to map Layer 3 address with Layer 2 address. You could see a very good explanation in this link.

      http://www.tildefrugal.net/tech/arp.php

    • profile image

      selvam 5 years ago

      because of this question i loose the interview..thanks for the nice explanation

    • profile image

      syed 5 years ago

      what is ARP PROTOCOL and how it works?

    • profile image

      Harsha 5 years ago

      Great work dude...Thanks a lot!!

    • profile image

      prakash 6 years ago

      dhcp client port no 68,server67..i like dhcp its simple concept

    • profile image

      Kuldeep Singh 6 years ago

      DORA Process

      D- Discover

      O- Offer

      R- Request

      A- Acknowledgement

    • profile image

      jim 6 years ago

      Hi Karthic,

      can you explain what are the contents of the DORA packets which are passed between server and client?

    • profile image

      choton 6 years ago

      plz give me your update knowledge share

    • karthickjck profile image
      Author

      karthickjck 7 years ago from Bangalore

      I can help you in ways to secure the Access Point.

      Please see my other hub this is applicable for access point as well.

      https://hubpages.com/technology/6-Best-Ways-to-Sec...

    • profile image

      Himanshu 7 years ago

      can you all please help me

      I have perform so many of desktop & system admin. but not selected yet

      Can you give me some interview questions for the same

      and 1 more thing I wanna ask

      If we giong to configure a wireless access point in a network

      what type of security we can provide.

      1 we can give password for that

      along with that can we give any unique thing by which nobody can access the network without permitting by Administrator?

      Himanshu

      +919716430065

    • karthickjck profile image
      Author

      karthickjck 7 years ago from Bangalore

      Hi Manu,

      Machine will send an Unicast to DHCP server asking for an ip address. DHCP server will look into its IP Pool and will give one of the IP addresses from the pool to the requesting machine.

      Thanks

      Karthick Murugan

    • profile image

      Manu 7 years ago

      How will the machine know which IP adress it should request for or how will the DHCP server know which IP it should offer to the client.( I believe it has knowledge only about the MAC address )

    • profile image

      sasi 7 years ago

      Hi kartik how plan to study for this system administrator interview questions like dns dhcp and acitive directory and i have a 1 ? to ask that how to creat a multiple user accounts in ad is there any tool is available or manually v have to type in a exel sheet

    • profile image

      mohan 7 years ago

      mohan_raj80@yahoo.co.in

    • profile image

      Rupesh 7 years ago

      what are port nos of dhcp?

      On which protocols it works?(behind dhcp)

    • karthickjck profile image
      Author

      karthickjck 7 years ago from Bangalore

      Yes.. Raakesh.. You are correct..Its UDP for DHCP..

    • profile image

      Raakesh 7 years ago

      You are correct Karthick. However, from what was understood, Sushil seem to be referring to the DORA process in specific. I believe UDP is being used for this.

    • karthickjck profile image
      Author

      karthickjck 7 years ago from Bangalore

      Sushil.. This protocol can work on both TCP and UDP.

    • profile image

      Raakesh 7 years ago

      DCHP depends on UDP to carry packets between the client and server tasks.

      Refer http://www.faqs.org/faqs/internet/tcp-ip/tcp-ip-fa... for complete information

    • profile image

      sushil kumar 7 years ago

      Is the protocol used by dhcp is UDP or TCP/IP.

    • profile image

      gugan 8 years ago

      thank you very much

    • karthickjck profile image
      Author

      karthickjck 8 years ago from Bangalore

      Yes.. with the Source Mac-address

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      gugan 8 years ago

      how the system that requesting ip from dhcp server is getting recognised by the dhcp server.

      for ex:

      based on mac address etc.