Bind files

This feature will automatically propagate new zones added to the primary to the secondary servers, or remove zones deleted from the primary, eliminating the need for separate scripts to do this. Using dnstap enables capturing both query and response logs, with a reduced impact on the overall throughput of the BIND server than native BIND logging.

Messages may be logged to a file or to a UNIX socket. Support for log-file rotation will depend on which option you choose. A DNS authoritative system is composed of a primary with one or more secondary servers. Zone files are established and updated on a primary server. Secondaries maintain copies of the zone files and answer queries. This configuration allows scaling the answer capacity by adding more secondaries, while zone information is maintained in only one place. The primary signals that updated information is available with a NOTIFY message to the secondaries, and the secondaries then initiate a zone transfer from the primary.

There are a number of configuration options for controlling the zone updating process. In the most common application, a web browser uses a local stub resolver library on the same computer to look up names in the DNS.

That stub resolver is part of the operating system. The stub resolver usually will forward queries to a caching resolver, a server or group of servers on the network dedicated to DNS services. Those resolvers will send queries to one or multiple authoritative servers in order to find the IP address for that DNS name. Prefetch popular records before they expire from the cache. This will improve the performance delivered to end users for resolving names that have short expiration times.

From time to time you may get incorrect or outdated records in the resolver cache. BIND 9 gives you the ability to remove them selectively or as a group. This allows you to give internal on-network and external from the Internet users different views of your DNS data, keeping some DNS information private.

BIND 9 offers two configuration parameters, fetches-per-zone and fetches-per-server. These features enable rate-limiting queries to authoritative systems that appear to be under attack.

These features have been successful in mitigating the impact of a DDoS attack on resolvers in the path of the attack. In BIND 9, this is enabled with a single command. The primary application is for blocking access to domains that are believed to be published for abusive or illegal purposes. There are companies that specialize in identifying abusive sites on the Internet, which market these lists in the form of RPZ feeds.

This feature minimizes leakage of excessive detail about the query to systems that need those details. Number Pages. Delete PDF Pages. Rotate PDF. PDF to Word. PDF to Excel. Word to PDF.

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