fixedaddresses

Fixed addresses, commonly referred to as static IP addresses, are permanent IP addresses assigned to a device on a network. They can be configured directly on the device (manual static IP) or provided by a DHCP server through a reservation, often called a fixed lease or DHCP reservation. In IPv6, fixed addressing can be implemented as manually assigned addresses or through controlled DHCPv6 configurations.

Implementation methods include manual static configuration, where the device is given a specific IP, subnet mask, gateway, and DNS settings. Alternatively, a DHCP server can reserve a particular IP for a device by tying it to the device’s MAC address, ensuring the device always receives the same address without manual changes. Static reservations combine the benefits of central management with the predictability of fixed addresses.

Common use cases for fixed addresses include servers (web, mail, file), network printers, routers and gateways, network-attached storage, and services requiring port forwarding or reliable remote access. Fixed addresses are also used in environments with stringent access controls, centralized logging, or where DNS records must consistently point to a specific host.

Best practices involve maintaining a clear IP address plan and documenting all fixed addresses, along with associated device names, locations, and services. Using IP address management (IPAM) tools helps prevent conflicts; regularly audit allocations and ensure DNS records are updated to reflect changes. Be mindful of scalability and consider DHCP reservations in larger networks to reduce manual maintenance while preserving predictability.

Overall, fixed addresses provide stability for essential devices and services, but require disciplined management to avoid conflicts and orphaned configurations.