What are DHCP ports?

DHCP is a network protocol to used to configure IP networks. A DHCP server listens to UDP port 67 and dynamically assigns IP addresses and other network parameters to DHCP clients. These clients will listen for responses on UDP port 68.

What is DHCP and how it works?

A DHCP Server is a network server that automatically provides and assigns IP addresses, default gateways and other network parameters to client devices. It relies on the standard protocol known as Dynamic Host Configuration Protocol or DHCP to respond to broadcast queries by clients.

Why does DHCP use two ports?

The use of an well known port (in our case 68) prevents the use of the same two destination port numbers and hence it prohibits other protocols from using the same port which is already in use by another protocol. In simple words, it prevents an application from getting a message from a completely different protocol.

What is the port number of DNS and DHCP?

DNS stands for Domain Name System. DHCP stands for Dynamic Host Configuration Protocol. DNS Server works on port no 53. DHCP Server works on ports 67 and 68.

Why well known port numbers are used for DHCP?

If all the DHCP client are not assigned port number 10000 for DHCP application, it may be possible that some clients are running another application on port number 10000. The packet from the DHCP server will be delivered to wrong client-application. Hence it is better to use well known-port numbers for DHCP.

Where is DHCP located?

DHCP Server Location On home networks the DHCP server is on the home router or home hub. Most home routers will have the DHCP server enabled by default (turned on). However you can use another computer e.g raspberry pi as a DHCP server, but it is generally not done.

How many packets are there in DHCP?

IP address is assigned from a pool of addresses. In DHCP, the client and the server exchange mainly 4 DHCP messages in order to make a connection, also called DORA process, but there are 8 DHCP messages in the process.

What is the difference between DHCP port 67 and 68?

The DHCP employs a connectionless service model, using the User Datagram Protocol (UDP). It is implemented with two UDP port numbers for its operations which are the same as for the bootstrap protocol (BOOTP). UDP port number 67 is the destination port of a server, and UDP port number 68 is used by the client.

How does DHCP assign IP?

The server replies to the client with a DHCP offer packet containing an IP address. The client receives and validates the offer, then sends a request packet back to the server to accept the address. The server sends an acknowledgement packet back to the client to confirm the chosen IP address.