Domain Name System

Domain Name System (DNS) is a distributed database system for managing host names and their associated Internet Protocol (IP) addresses.

With DNS, people can use simple names, such as to locate a host, rather than using the IP addresses, for example, in IPv4, or 2001:D88::1 in IPv6. A single server might be responsible only for knowing the host names and IP addresses for a small part of a zone, but DNS servers can work together to map all domain names to their IP addresses. DNS servers that work together allow computers to communicate across the Internet.

For IBM® i Version 6 Release 1 (V6R1), DNS services are based on the industry-standard DNS implementation, known as Berkeley Internet Name Domain (BIND) version 9. For previous IBM i releases, DNS services were based on BIND version 8.2.5. To use the new BIND version 9 DNS server, you must have IBM i option 31 (DNS) and option 33 (Portable Application Solutions Environment (PASE)) installed. As of IBM i V6R1, for security reasons, BIND 4 and 8 are replaced with BIND 9. Thus, the migration to BIND 9 is required for your DNS server.