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Name Server: NS
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The name server record specifies the name of the name server for this zone. It has a resource record type of NS. If you have more than one name server, list them in NS records. These records usually follow the SOA record. As they usually apply to the same domain as the SOA record, their name field is often left blank to inherit the server's domain name specified by the @ symbol in the previous SOA record.
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IN NS turtle.mytrek.com.
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You can, if you wish, enter the domain name explicitly as shown here:
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mytrek.com. IN NS turtle.mytrek.com.
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Address Record: A and A6
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Resource records of type A are address records that associate a fully qualified domain name with an IP address. Often, only their hostname is specified. Any domain names without a terminating period automatically have the domain appended to it. Given the domain mytrek.com, the turtle name in the following example is expanded to turtle.mytrek.com:
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rabbit.mytrek.com. IN turtle IN A A 192.168.1.2 192.168.1.1
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BIND versions 8.2.2 and 9.1 support IPv6 addresses. IPv6 IP addresses have a very different format from that of the IPv4 addresses commonly used (see 38). Instead of the numerals arranged in four segments, IPv6 uses hexadecimal numbers arranged in seven segments. Though BIND checks for both IPv4 and IPv6 addresses, currently you should always use a system's IPv4 address if it has one. In the following example, divit.mygolf.com is associated with its IPv6 address.
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divit.mygolf.com IN A6 3ffe:8050:201:1860:1::3
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BIND also supports IPv6 resolution features such as A6 chains, which allows you to specify part of the address as a network domain name. This would be the name of a network through which the host connects to the Internet. The network domain name is then used to complete the address.
divit.mygolf.com IN A6 0:0:0:0:1::3mytrek.com.
Mail Exchanger: MX
The Mail Exchanger record, MX, specifies the mail server that is used for this zone or for a particular host. The mail exchanger is the server to which mail for the host is sent. In the following example, the mail server is specified as turtle.mytrek.com. Any mail sent to the address for any machines in that zone will be sent to the mail server, which in turn will send it to the specific machines. For example, mail sent to a user on rabbit.mytrek.com will first be sent to turtle.mytrek.com, which will then send it on to rabbit.mytrek.com. In the following example, the host 192.168.1.1 (turtle.mytrek.com) is defined as the mail server for the mytrek.com domain:
mytrek.com. IN MX 10 192.168.1.1
You could also inherit the domain name from the SOA record, leaving the domain name entry blank.
IN MX 10 192.168.1.1
An MX record recognizes an additional field that specifies the ranking for a mail exchanger. If your zone has several mail servers, you can assign them different rankings in their MX records. The smaller number has a higher ranking. This way, if mail cannot reach the first mail server, it can be routed to an alternate server to reach the host. In the following example, mail for hosts on the mytrek.com domain is first routed to the mail server at 192.168.1.1 (turtle.mytrek.com), and if that fails, it is routed to the mail server at 192.168.1.1 (rabbit.mytrek.com).
mytrek.com. IN MX 10 turtle.mytrek.com IN MX 20 rabbit.mytrek.com
You can also specify a mail server for a particular host. In the following example, the mail server for lizard.mytrek.com is specified as rabbit.mytrek.com:
lizard.mytrek.com. IN IN A MX 10 192.168.1.3 rabbit.mytrek.com.
Aliases: CNAME
Resource records of type CNAME are used to specify alias names for a host in the zone. Aliases are often used for machines running several different types of servers, such as both Web and FTP servers. They are also used to locate a host when it changes its name. The old name becomes an alias for the new name. In the following example, ftp.mytrek.com is an alias for a machine actually called turtle.mytrek.com:
ftp.mytrek.com. IN CNAME turtle.mytrek.com.
The term CNAME stands for canonical name. The canonical name is the actual name of the host. In the example above the canonical name is turtle.mytrek.com. The alias, also know as the CNAME, is ftp.mytrek.com. In a CNAME entry, the alias points to the canonical name. Aliases cannot be used for NS (name server) or MX (mail server) entries.
A more stable way to implement aliases is simply to create another address record for it. You can have as many hostnames for the same IP address as you want, provided they are certified. For example, to make www.mytrek.com an alias for turtle.mytrek.com, you only have to add another address record for it, giving it the same IP address as turtle.mytrek.com.
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