CyberGuard dictionary / Network Security
Dynamic Host Configuration Protocol
Dynamic Host Configuration Protocol automatically supplies network settings such as an IP address, subnet information, gateway, and DNS servers to a device.
In simple terms
A device joins a network and receives the settings it needs instead of requiring a person to enter each one.
Technical explanation
In IPv4 DHCP, a client and server exchange discovery, offer, request, and acknowledgment messages to lease configuration for a limited period. Unauthorized DHCP servers can distribute harmful settings, so network trust still matters.
DHCP leases settings such as IP address, gateway, and DNS resolver to clients for a period of time. Unauthorized or faulty servers can give devices incorrect network settings.
Examples in practice
A new office laptop receives an address, router, and DNS resolver from the approved DHCP server when it connects.
A rogue device offers laptops a gateway that sends traffic through an unexpected host. Network staff locate the unauthorized DHCP server and confirm affected lease assignments.
Why it matters
Correct configuration supports normal connectivity; a rogue response can redirect traffic or break access.
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Sources and further reading
Published 2026-10-15 · Last updated 2026-10-15 · CyberGuard editorial content. Source links provide context; they do not imply endorsement.