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DNS Configuration and Management Manual (G06.27+, H06.05+, J06.03+)

ManualsBrandsHP ManualsServerHP Integrity NonStop H-Series
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DNS and BIND Basics
HP DNS Configuration and Management Manual—529432-003
A-3
The Resolver
SOA record from the master and then initiating a zone transfer if the record has
changed).
The DNS Notify feature is enabled in the master server by default. In some
environments, the master server in a zone may be an 8.1.2 or later server with DNS
Notify enabled, while the other servers in the zone are 4.x servers (without the DNS
Notify feature). In such environments, whenever the master changes and sends a
notification to other servers, the 4.x servers ignore this notification because they do not
understand the DNS Notify protocol.
Dynamic DNS Update
See Section 2, BIND 9.x on the NonStop Server for information about dynamic update.
Incremental Zone Transfer (IXFR)
See Section 2, BIND 9.x on the NonStop Server for information about IXFR.
The Resolver
Resolvers match host names to IP addresses and IP addresses to host names. The
resolver is the client portion of the Domain Name System. A resolver queries a name
server for data and is responsible for:
•
Translating an application's request for data into a DNS query packet and then
sending the packet to a name server
•
Retransmitting the packet, possibly to another name server, if the queried name
server does not respond
The Name Server
The name server is the demon named. The named demon is a program that has
information about the domain's tree structure and database information. By extension,
hosts on which the
named process runs are also called name servers. Name servers
respond to queries either from resolvers or from other name servers. The name server
that the resolver initially contacts does most of the work, but the name server may
need to contact other name servers for direction and information.
Configured name servers provide the following functionality:
•
Know the name server(s) for the root of the DNS tree
•
Respond to queries for DNS name space data
•
Query other name servers to find data elsewhere in the name space
Types of Name Servers
Most DNS servers play multiple roles: they may be masters (authoritative) for some
zones, slaves for others, and provide caching or forwarding for all others.