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DNS zone transfer, also sometimes known by the inducing DNS query type AXFR, is a type of DNS transaction. It is one of the many mechanisms available for administrators to replicate DNS databases across a set of DNS servers .
RFC 1995 – Incremental Zone Transfer in DNS, Proposed Standard. RFC 1996 – A Mechanism for Prompt Notification of Zone Changes (DNS NOTIFY), Proposed Standard. RFC 2136 – Dynamic Updates in the Domain Name System (DNS UPDATE), Proposed Standard. RFC 2181 – Clarifications to the DNS Specification, Proposed Standard.
The SOA record for a zone contains data to control the zone transfer. This is the serial number and different timespans. It also contains the email address of the responsible person for this zone, as well as the name of the primary master name server. Usually the SOA record is located at the top of the zone. A zone without a SOA record does not ...
A DNS zone is an administrative space allowing more granular control of the DNS components, such as authoritative nameserver. The DNS is broken up into different zones, distinctly managed areas in the DNS namespace. DNS zones are not necessarily physically separated from one another; however, a DNS zone can contain multiple subdomains, and ...
Incremental Zone Transfer: Requests a zone transfer of the given zone but only differences from a previous serial number. This request may be ignored and a full (AXFR) sent in response if the authoritative server is unable to fulfill the request due to configuration or lack of required deltas.
The format of a zone file is defined in RFC 1035 (section 5) and RFC 1034 (section 3.6.1). This format was originally used by the Berkeley Internet Name Domain (BIND) software package, but has been widely adopted by other DNS server software – though some of them (e.g. NSD, PowerDNS) are using the zone files only as a starting point to compile them into database format, see also Microsoft ...
It is identified in the start-of-authority (SOA) resource record. A secondary server for a zone uses an automatic updating mechanism to maintain an identical copy of the primary server's database for a zone. Examples of such mechanisms include DNS zone transfers and file transfer protocols. DNS provides a mechanism whereby the primary for a ...
A wildcard MX will apply only to names in the zone which aren't listed in the DNS at all." That is, if there is a wildcard MX for *.example.com , and an A record (but no MX record) for www.example.com , the correct response (as per RFC 1034 ) to an MX request for www.example.com is "no error, but no data"; this is in contrast to the possibly ...