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Your name server holds domain name information about the hosts on your network in resource records placed in zone and reverse mapping files. Resource records are used to associate IP addresses with fully qualified domain names. You need a record for every computer in the zone that the name server services. A record takes up one line, though you can use parentheses to use several lines for a record, as is usually the case with SOA records. A resource record uses the Standard Resource Record Format as shown here:
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name [<ttl>] [<class>] <type> <rdata> [<comment>]
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Here, name is the name for this record. It can be a domain name for a fully qualified domain name. If you only specify the hostname, the default domain is appended. If no name entry exists, the last specific name is used. If the @ symbol is used, the name server's domain name is used. ttl (time to live) is an optional entry that specifies how long the record is to be cached, and class is the class of the record. The class used in most resource record entries is IN, for Internet. By default, it is the same as that specified for the domain in the named.conf file. type is the type of the record. rdata is the resource record data. The following is an example of a resource record entry. The name is rabbit.mytrek.com, the class is Internet (IN), the type is a host address record (A), and the data is the IP address 192.168.1.2.
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rabbit.mytrek.com. IN A 192.168.1.2
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Type A A6 NS CNAME SOA WKS PTR RP HINFO MINFO MX TXT
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Table 25-8: Domain Name Service Resource Record Types Description Host address, maps host name to IP address An IPv6 Host address Authoritative name server for this zone Canonical name, used to define an alias for a hostname Start of Authority, starts DNS entries in zone file, specifies name server for domain, and other features like server contact and serial number Well-known service description Pointer record, for performing reverse domain name lookups, maps IP address to hostname Text string that contains contact information about a host Host information Mailbox or mail list information Mail exchanger, informs remote site of your zone's mail server Text strings, usually information about a host
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Table 25-8: Domain Name Service Resource Record Types Description Domain private key Resource record signature Next resource record
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Different types of resource records exist for different kinds of hosts and name server operations (see Table 25-8 for a listing of resource record types). A, NS, MX, PTR, and CNAME are the types commonly used. A is used for host address records that match domain names with IP addresses. NS is used to reference a name server. MX specifies the host address of the mail server that services this zone. The name server has mail messages sent to that host. The PTR type is used for records that point to other resource records and is used for reverse mapping. CNAME is used to identify an alias for a host on your system.
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Start of Authority: SOA
A zone and reverse mapping files always begin with a special resource record called the Start of Authority (SOA) record. This record specifies that all the following records are authoritative for this domain. It also holds information about the name server's domain, which is to be given to other name servers. An SOA record has the same format as other resource records, though its data segment is arranged differently. The format for an SOA record follows:
name {ttl} class SOA Origin Person-in-charge ( Serial number Refresh Retry Expire Minimum )
Each zone has its own SOA record. The SOA begins with the zone name specified in the named.conf zone entry. This is usually a domain name. An @ symbol is usually used for the name and acts like a macro expanding to the domain name. The class is usually the Internet class, IN. SOA is the type. Origin is the machine that is the origin of the records, usually the machine running your name server daemon. The person-in-charge is the e-mail address for the person managing the name server (use dots, not @, for the e-mail address, as this symbol is used for the domain name). Several configuration entries are placed in a block delimited with braces. The first is the serial number. You change the serial number when you add or change records, so that it is updated by other servers. The serial number can be any number, as long as it is incremented each time a change is made to any record in the zone. A common practice is to use the year-month-day number for the serial number, where number is the number of changes in that day. For example, 1999120403 would be the year 1999, December 4, for the third change. Be sure to update it when making changes. Refresh specifies the time interval for refreshing SOA information. Retry is the frequency for trying to contact an authoritative server. Expire is the length of time a secondary name server keeps information about a zone without updating it. Minimum is the length of time records in a zone live. The times are specified in the number of seconds.
The following example shows an SOA record. The machine running the name server is turtle.mytrek.com, and the e-mail address of the person responsible for the server is hostmaster.turtle.mytrek.com. Notice the periods at the end of these names. For names with no periods, the domain name is appended. turtle would be the same as turtle.mytrek.com. When entering full hostnames, be sure to add the period so that the domain is not appended.
@ IN SOA turtle.mytrek.com. hostmaster.turtle.mytrek.com. ( 1997022700 ; Serial 28800 ; Refresh 14400 ; Retry 3600000 ; Expire 86400 ) ; Minimum
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