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This is not done immediately after each dynamic update, because that would be too slow when a large zone is updated frequently.
Instead, the dump is delayed by up to 15 minutes, allowing additional updates to take place.
However, since listing addresses of internal servers that external clients cannot possibly reach can result in connection delays and other annoyances, an organization may choose to use a Split DNS to present a consistent view of itself to the outside world.
Another common reason for setting up a Split DNS system is to allow internal networks that are behind filters or in RFC 1918 space (reserved IP space, as documented in RFC 1918) to resolve DNS on the Internet.
The only way to ensure that the zone file of a dynamic zone is up to date is to run The incremental zone transfer (IXFR) protocol is a way for slave servers to transfer only changed data, instead of having to transfer the entire zone. These include master zones maintained by dynamic update and slave zones whose data was obtained by IXFR.
One common reason for setting up a DNS system this way is to hide "internal" DNS information from "external" clients on the Internet.
The format and meaning of these messages is specified in RFC 2136. Once enabled, Kerberos signed requests will be matched against the update policies for the zone, using the Kerberos principal as the signer for the request.
Updating of secure zones (zones using DNSSEC) follows RFC 3007: RRSIG, NSEC and NSEC3 records affected by updates are automatically regenerated by the server using an online zone key.
wants its internal clients to be able to resolve external hostnames and to exchange mail with people on the outside.
The company also wants its internal resolvers to have access to certain internal-only zones that are not available at all outside of the internal network.
When you’re satisfied with all your changes, you need to tell bind to reload, and allow dynamic updates again.