If you are connected to the Internet, use the root servers
already available. (For a list of root servers, use anonymous ftp to get the file /domain/named.ca from nic.ddn.mil.) However, if you are on an isolated network,
you must set up your own root servers.
A root server does not have a cache line in its boot file.
Instead, it has a line like this, which indicates that the server
is primary for the root domain:
The db.root file typically contains only NS and A resource records for the authoritative name space
tree. You can use the hosts_to_named command with the -r option to create the db.root file. Type man hosts_to_named for more information.
The db.cache file on the other name servers in the domain should contain
an entry for this root server.
A domain may have more than one root name server.
Following is an example of the root zone file, db.root. In the example db.root file, hosts rabbit.div.inc.com, denny.dept.inc.com, and sally.doc.inc.com are authoritative name servers for the root domain. Hosts eduardo.inc.com and labs.inc.com are authoritative for the inc.com subdomain.
@ IN SOA rabbit.div.inc.com.
root.moon.div.inc.com. (
3 ; Serial
10800 ; Refresh after 3 hours
3600 ; Retry after 1 hour
604800 ; Expire after 1 week
86400 ) ; Minimum ttl of 1 day
IN NS rabbit.div.inc.com.
IN NS denny.dept.inc.com.
IN NS sally.dept.inc.com.
rabbit.div.inc.com. 86400 IN A 15.19.8.119
denny.dept.inc.com. 86400 IN A 15.19.15.33
sally.doc.inc.com. 86400 IN A 15.19.9.17
; ; set ttl to 3 days ;
inc.com. 259200 IN NS eduardo.inc.com.
25920 IN NS labs.inc.com.
15.in-addr.arpa. 259200 IN NS eduardo.inc.com.
259200 IN NS labs.inc.com.
eduardo.inc.com. 259200 IN A 15.19.11.2
labs.inc.com. 259200 IN A 15.19.13.7 |
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