DHCP - DORA Process

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 DHCP - DORA Process

DORA

    DORA is the process that DHCP employs (Dynamic Host Configuration Protocol). It's used to provide clients/host machines with their IP addresses. It is divided into four phases and acquires the IP address from a centralized server.


D-Discover

O-Offer

R-Request

A-Acknowledgment







[BROADCAST] DHCP Discover

  • The first communication in the DORA Process is the Discover message, which is used to locate the DHCP Server in the network.
  • The host will broadcast a Discover message over the network to locate a DHCP Server.
  • 255.255.255.255 is the packet address.
  • Because the host does not have an IP address, the IP is currently 0.0.0.0.
  • PORTS [at the client - 68] / [at the server - 67].

  • The server will use the host's MAC Address to reach out to it.
  • Transaction ID: which maintains the specific DHCP session between client-server, which remains the same during [discover + offer] ] the processes.




[UNICAST] DHCP Offer

  • When the server receives the Discover Request, it sends the client a DHCP Offer request.
  • This offers information about an IP address and the length of time a host can utilize i
  • It's a message that's only sent to one person.




[BROADCAST] DHCP Request

  • After receiving the Offer packet, the host responds with a Request message
  • This message informs the server that it is prepared to accept the IP address offered by the serve
  • The broadcast IP is still 255.255.255.255, and this IP is still 0.0.0.0.



[UNICAST] DHCP Acknowledgement

  • The host sends the request to the server.
  • This message is a response to the host's request message.
  • It will also send a DHCP Acknowledgement request to the host. Which will contain the host's IP address and subnet mask as allowed by the server.





TechMight Solutions: Dynamic Host Configuration Protocol (DHCP)







Location: Chennai, Tamil Nadu, India

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