a domain name is a pointer to an index in the DNS database

"hosts" contain information about the domain (mail servers, location, etc.)

subdomains are called children

"Delegation, in the abstract, involves assigning responsibility for some part of your domain to another organization. What really happens, however, is the assignment of authority for your subdomains to different name servers. (Note that we said "name servers," not just "name server.")"

logging syntax:

logging {
  [ channel channel_name {
    ( file path_name
       [ versions ( number | unlimited ) ]
       [ size size_spec ]
     | syslog ( kern | user | mail | daemon | auth | syslog | lpr |
                news | uucp | cron | authpriv | ftp |
                local0 | local1 | local2 | local3 |
                local4 | local5 | local6 | local7 )
     | stderr
     | null );

    [ severity ( critical | error | warning | notice |
                 info  | debug [ level ] | dynamic ); ]
    [ print-category yes_or_no; ]
    [ print-severity yes_or_no; ]
    [ print-time yes_or_no; ]
  }; ]

  [ category category_name {
    channel_name; [ channel_name; ... ]
  }; ]
  ...
};

"You have a single zone, with all of your hosts in that zone.

You break your zone into a number of subdomains, some of them in the same zone as the parent, if necessary. You provide CNAME records in the parent zone for well-known hosts that have moved into subdomains.

After a grace period, you delete any remaining CNAME records.

You handle subdomain delegation updates, either manually or by using stub zones, and periodically check delegation."



possible to give different access to certain IP numbers with BIND

"options {
	directory "/var/named";
};

acl "fx-subnet" { 192.253.254/24; };

view "internal" {  // internal view of our zones

	match-clients { "fx-subnet"; };

	zone "fx.movie.edu" {
		type master;
		file "db.fx.movie.edu";
	};

	zone "254.253.192.in-addr.arpa" {
		type master;
		file "db.192.253.254";
	};
};

view "external" {  // view of our zones for the rest of the world

	match-clients { any; };  // implicit
	recursion no;            // outside of our subnet, they shouldn't be
                             // requesting recursion
	zone "fx.movie.edu" {
		type master;
		file "db.fx.movie.edu.external";  // external zone data file
	};

	zone "254.254.192.in-addr.arpa" {
		type master;
		file "db.192.253.254.external";   // external zone data file
	};
};"

have a DNS server with opposite results