Understanding DHCP and Static IP Addressing

DHCP (Dynamic Host Configuration Protocol) automatically assigns IP addresses to devices on the network. Most end-user devices (computers, phones, tablets) should use DHCP — it's simpler to manage and avoids IP conflicts. DHCP leases have a duration (typically 24 hours to 7 days); the device renews the lease before it expires. Static IP addresses are manually configured and don't change. Use them for servers, printers, network-attached storage, IP cameras, and VoIP phones — devices that other systems need to consistently find at the same address. Configure static IPs either directly on the device or via DHCP reservations (assigning a specific IP to a device's MAC address in the DHCP server settings). DHCP reservations are preferred over manual static IPs because they prevent IP conflicts (the DHCP server won't assign the reserved IP to another device) and keep all IP assignments visible in one place. Document your IP address scheme — keep a spreadsheet or use an IPAM tool to track which IPs are assigned to which devices.