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A PTR record is used to perform reverse mapping from an IP address to a host. PTR records are used in the reverse mapping files. The name entry holds a reversed IP address and the data entry holds the name of the host. The following example maps the IP address 192.168.1.1 to turtle.mytrek.com:
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1.1.168.192 IN PTR turtle.mytrek.com.
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In a PTR record you can specify just that last number segment of the address (the host address), and let DNS fill in the domain part of the address. In the next example, 1 has the domain address, 1.168.192, automatically added to give 1.1.168.192:
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1 IN PTR turtle.mytrek.com.
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Host Information: HINFO, RP, MINFO, and TXT
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The HINFO, RP, MINFO, and TXT records are used to provide information about the host. The RP record enables you to specify the person responsible for a certain host. The HINFO record provides basic hardware and operating system identification. The TXT record is used to enter any text you want. MINFO provides a host's mail and mailbox information. These are used sparingly as they may give too much information out about the server.
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A DNS server uses several zone files covering different components of the DNS. Each zone uses two zone files: the principal zone file and a reverse mapping zone file. The zone file contains the resource records for hosts in the zone. A reverse mapping file contains records that provide reverse mapping of your domain name entries, enabling you to map from IP addresses to domain names. The name of the file used for the zone file can be any name. The name of the file is specified in the zone statement's file entry in the named.conf file. If your server supports several zones, you may want to use a name that denotes the specific zone. Most systems use the domain name as the name of the zone file. For example, the zone mytrek.com would have a zone file also called mytrek.com. These could be placed in a subdirectory called zones or master. The zone file used in the following example is called mytrek.com. The reverse mapping file can also be any name, though it is usually the reverse IP address domain specified in its corresponding zone file. For example, in the case of mytrek.com zone file, the reverse mapping file might be called 192.168.1, the IP address of the mytrek.com domain defined in the mytrek.com zone file. This file would contain reverse mapping of all the host addresses in the domain, allowing their hostname addresses to be mapped to their corresponding IP addresses. In addition, BIND sets up a cache file and a reverse mapping file for the localhost. The cache file holds the resource records for the root name servers to which your name server connects. The cache file can be any name, although
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it is usually called named.ca. The localhost reverse mapping file holds reverse IP resource records for the local loopback interface, localhost. Although localhost can be any name, it usually has the name named.local.
Zone Files for Internet Zones
A zone file holds resource records that follow a certain format. The file begins with general directives to define default domains or to include other resource record files. These are followed by a single SOA, name server, and domain resource records, and then resource records for the different hosts. Comments begin with a semicolon and can be placed throughout the file. The @ symbol operates like a special macro, representing the domain name of the zone to which the records apply. The @ symbol is used in the first field of a resource or SOA record as the zone's domain name. Multiple names can be specified using the * matching character. The first field in a resource record is the name of the domain to which it applies. If the name is left blank, the next previous explicit name entry in another resource record is automatically used. This way, you can list several entries that apply to the same host without having to repeat the host name. Any host or domain name used throughout this file that is not terminated with a period has the zone's domain appended to it. For example, if the zone's domain is mytrek.com and a resource record has only the name rabbit with no trailing period, the zone's domain is automatically appended to it, giving you rabbit.mytrek.com. Be sure to include the trailing period whenever you enter the complete fully qualified domain name as in turtle.mytrek.com.. You can also use several directives to set global attributes. $ORIGIN sets a default domain name to append to address names that do not end in a period. $INCLUDE includes a file. $GENERATE can generate records whose domain or IP addresses differ only by an iterated number. A zone file begins with an SOA record specifying the machine the name server is running on, among other specifications. The @ symbol is used for the name of the SOA record, denoting the zone's domain name. After the SOA, the name server resource records (NS) are listed. Just below the name server records are resource records for the domain itself. Resource records for host addresses (A), aliases (CNAME), and mail exchangers (MX) follow. The following example shows a sample zone file, which begins with an SOA record and is followed by an NS record, resource records for the domain, and then resource records for individual hosts:
; Authoritative data for turle.mytrek.com ; @ IN SOA turtle.mytrek.com. hostmaster.turtle.mytrek.com.( 93071200 ; Serial number 10800 ; Refresh 3 hours 3600 ; Retry 1 hour 3600000 ; Expire 1000 hours 86400 ) ; Minimum 24 hours IN IN IN IN turtle gopher ftp www IN IN IN IN IN NS A MX MX turtle.mytrek.com. 192.168.1.1 turtle.mytrek.com. rabbit.mytrek.com. 192.168.1.1 PC-686 LINUX turtle.mytrek.com. turtle.mytrek.com. 192.168.1.1
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