secondary name
* servers should use when updating remote copies of this domain.
* retry: Length of time (seconds) to wait after a
* failed refresh before making a second attempt.
* expire: Maximum length of time (seconds) a secondary
* DNS server should retain remote copies of the zone data without a
* successful refresh before discarding.
* minimum-ttl: Minimum length of time (seconds) a
* client can continue to use a DNS resolution before it should request
* a new resolution from the server. Can be overridden by individual
* resource records.
*
*
*
* AAAA
*
* ipv6: IPv6 address
*
*
*
* A6(PHP >= 5.1.0)
*
* masklen: Length (in bits) to inherit from the target
* specified by chain.
* ipv6: Address for this specific record to merge with
* chain.
* chain: Parent record to merge with
* ipv6 data.
*
*
*
* SRV
*
* pri: (Priority) lowest priorities should be used first.
* weight: Ranking to weight which of commonly prioritized
* targets should be chosen at random.
* target and port: hostname and port
* where the requested service can be found.
* For additional information see: RFC 2782
*
*
*
* NAPTR
*
* order and pref: Equivalent to
* pri and weight above.
* flags, services, regex,
* and replacement: Parameters as defined by
* RFC 2915.
*
*
*
*
*
* @throws NetworkException
*
*/
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