NETWORKING

DHCP Explained for Beginners

Understand how DHCP supplies network settings and how to troubleshoot a client that does not receive a usable address.

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What DHCP provides

DHCP can supply an IP address, subnet mask/prefix, default gateway, DNS servers, and other options.

The basic exchange

A client and DHCP service perform a discovery/offer/request/acknowledgment process in common IPv4 scenarios.

Common symptoms

A client may have no address, a self-assigned address, the wrong subnet, missing gateway/DNS information, or an expired lease.

Troubleshooting

Check physical connectivity, VLAN, client configuration, DHCP scope/service, relay path where applicable, and exhaustion or policy.

Avoid random resets

Capture the current configuration and symptoms before renewing or changing settings so useful evidence is not lost.

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