Anycast methods are useful for global load balancing and are commonly used in distributed DNS systems. In IPv4, anycast addressing implementations typically operate using the shortest-path metric of BGP routing and do not take into account congestion or other attributes of the path.
A second assignment of an address generally stops the IP functionality of one or both of the devices. In residential networks, NAT functions are usually implemented in a residential gateway. IPv6 does not implement broadcast addressing, and replaces it with multicast to the specially defined all-nodes multicast address.
Persistent configuration is also known as using a static IP address. The addresses include a bit pseudorandom number that minimizes the risk of address collisions if sites merge or packets are misrouted. Private addresses Just as IPv4 reserves addresses for private networks, blocks of addresses are set aside in IPv6.
Microsoft Windows provides the command-line interface tools ipconfig and netsh and users of Unix-like systems may use ifconfignetstatroutelanstat, fstatand iproute2 utilities to accomplish the task.