Summary
DHCP is a network protocol that automatically provides IP addresses, subnet masks, default gateways, and DNS server addresses to devices on a network, eliminating the need for manual configuration.
What is DHCP?
The Dynamic Host Configuration Protocol operates on a client-server model. When a device connects to a network, it broadcasts a request; the DHCP server responds with a lease containing an IP address and additional network parameters valid for a defined period.
DHCP simplifies network administration significantly. Without it, administrators would have to manually assign and track IP addresses for every device. Modern DHCP servers can also pass custom options such as NTP server addresses, boot server locations, or domain names.
In cloud environments, DHCP is often handled by the networking layer itself. OpenStack Neutron, for example, runs a DHCP agent per subnet to hand out addresses to virtual machine interfaces automatically.
Why is DHCP relevant?
- Automation: Eliminates manual IP address assignment across large fleets of devices
- Scalability: Supports dynamic environments where devices frequently join and leave the network
- Consistency: Centralises network parameter distribution, reducing misconfiguration