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However, when placed together in a single file, they become easier to understand. The following example shows a very basic zone file. All directives and resource records should be entered on individual lines.Comments can be placed after semicolon characters ( Sets the default Time to Live (TTL) value for the zone.Increasing this value allows remote nameservers to cache the zone information for a longer period of time, reducing the number of queries for the zone and lengthening the amount of time required to proliferate resource record changes. Next, two nameservers are listed as authoritative for the domain. It is not important whether these nameservers are slaves or if one is a master; they are both still considered authoritative. Each zone file may contain directives and resource records.
If the master has not replied to a refresh request before the amount of time specified in the directive is the amount of time other nameservers cache the zone's information. dns1 IN A 10.0.1.1 dns2 IN A 10.0.1.2 server1 IN A 10.0.1.5 server2 IN A 10.0.1.6 ftp IN A 10.0.1.3 IN A 10.0.1.4 mail IN CNAME server1 mail2 IN CNAME server2 www IN CNAME server1$ORIGIN 1.0.10.
When configuring BIND, all times are specified in seconds.
However, it is possible to use abbreviations when specifying units of time other than seconds, such as minutes ( Seen individually, directives and resource records can be difficult to grasp. ( 2001062501 ; serial 21600 ; refresh after 6 hours 3600 ; retry after 1 hour 604800 ; expire after 1 week 86400 ) ; minimum TTL of 1 day IN NS dns1.
The first resource record in any Domain Name System (DNS) zone file is the Start of Authority (SOA) resource record.
The SOA resource record is an essential part of the DNS zone file, it indicates the basic properties of the domain name server and the zone that the domain is in.