June 2018
Intermediate to advanced
368 pages
11h 1m
English
Content preview from Managing Mission - Critical Domains and DNS
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Format of an RR
In our examples, the syntax will be described in generic DNS record format/zone file format:
<OWNER-NAME> <TTL> <CLASS> <TYPE> <DATA>
- OWNER-NAME (or ONAME): The domain or hostname of the current resource record. This is distinct from the Registrant (the "owner" of a domain name registration). If the ONAME does not end in a ".", the current $ORIGIN zone will be appended to it. The @ special character denotes the current $ORIGIN (explained next). The first record of a zone must have an OWNER-NAME; it is optional in all subsequent records. When omitted, the last used OWNER-NAME will be used.
- TTL: (optional) The Time to Live (TTL) of the current record. This governs how long resolvers will keep this answer in their local cache ...
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