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Illustrated TCP/IP
by Matthew G. Naugle Wiley Computer Publishing, John Wiley & Sons, Inc. ISBN: 0471196568 Pub Date: 11/01/98 |
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Example DNS Database
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A database is made up of records and the DNS is a database. Therefore, common resource record types in the DNS database are:
A | Host’s IP address, |
PTR | Host’s domain name, host identified by its IP address |
CNAME | Host’s canonical name, host identified by an alias domain name |
MX | Host’s or domain’s mail exchanger |
NS | Host’s or domain’s name server(s) |
SOA | Indicates authority for the domain |
TXT | Generic text record |
SRV | Service location record |
RP | Responsible person |
When a resolvers requests information from the server, included in the request will be one of the preceding types. In this way, the server will know exactly what the resolver is requesting; this could be a mail server, an IP address translation, or simply a request for some generic information.
I am not going to explain all the records in the database, but some of the more useful ones are discussed next.
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