named.conf Statements
The named.conf file contains statements and comments. Statements end with a semicolon. Some statements can contain a contain a block of statements. Again, each statement in the block is terminated with a semicolon.
The named.conf file supports the following statements.
Table 5-5 named.conf Statements
| acl | Defines a named IP address match list used for access control. The address match list designates one or more IP addresses (dotted-decimal notation) or IP prefixes (dotted-decimal notation followed with a slash and the number of bits in the netmask). The named IP address match list must be defined by an acl statement before it can be used elsewhere; no forward references allowed. |
| include | Inserts an include file at the point where the include statement is encountered. Use include to break up the configuration into more easily managed chunks. |
| key | Specifies a key ID used for authentication and authorization on a particular name server. See the server statement. |
| logging | Specifies the information the server logs and the destination of log messages. |
| options | Controls global server configuration options and sets default values for other statements. |
| server | Sets designated configuration options associated with a remote name server. Selectively applies options on a per-server basis, rather than to all servers. |
| zone | Defines a zone. Selectively applies options on a per-zone basis, rather than to all zones. |
Example 5-13 Example Master Configuration File for a master server
The named.ca File
The named.ca file establishes the names of root servers and lists their addresses. If your network is connected to the Internet, named.ca lists the Internet name servers; otherwise, it lists the root domain name servers for your local network. The in.named daemon cycles through the list of servers until it contacts one of them. It then obtains from that server the current list of root servers, which it uses to update named.ca.
Setting Up the named.ca File
Root server names are indicated in the NS record and addresses in the A record. You need to add an NS record and an A record for each root server you want to include in the file.
How you obtain or create your named.ca file depends on whether or not your network is connected to the world Internet.
Internet named.ca File
If your network is connected to the Internet, at the present time you obtain your named.ca file from InterNIC registration services through the following.
Anonymous FTP. The FTP site is: ftp.rs.internic.net. The file name is: /domain/named.root.
Gopher. The Gopher site is: rs.internic.net. The file is: named.root, which can be found under the InterNIC Registration Services menu, InterNIC Registration Archives submenu.
If you are following the naming conventions used in this manual, you then move named.root to /var/named/named.ca.
Example 5-14 Example Internet named.ca file