HP-UX Reference (11i v2 07/12) - 4 File Formats (vol 8)

n
named.conf(4) named.conf(4)
[ min-refresh-time number ; ]
[ max-refresh-time number ; ]
[ min-retry-time number ; ]
[ max-retry-time number ; ]
}];
zone Statement Definition and Usage
Zone Types
master
The server has a master copy of the data for the zone and will be able to provide authorita-
tive answers for it.
slave A slave zone is a replica of a master zone. The masters list specifies one or more IP
addresses of master servers that the slave contacts to update its copy of the zone. By
default, transfers are made from port 53 on the servers; this can be changed for all servers
by specifying a port number before the list of IP addresses, or on a per-server basis after
the IP address. Authentication to the master can also be done with per-server TSIG keys.
If a file is specified, then the replica will be written to this file whenever the zone is
changed, and reloaded from this file on a server restart. Use of a file is recommended,
since it often speeds server start-up and eliminates a needless waste of bandwidth. If the
database files are very large, it is recommended to place them in different directories.
stub A stub zone is similar to a slave zone, except that it replicates only the NS records of a mas-
ter zone instead of the entire zone. Stub zones are not a standard part of the DNS; they
are a feature specific to the BIND implementation. Stub zones can be used to eliminate the
need for glue NS record in a parent zone at the expense of maintaining a stub zone entry
and a set of name server addresses in named.conf. This usage is not recommended for new
configurations, and BIND 9.2 supports it only in a limited way. In BIND 4/8, zone
transfers of a parent zone included the NS records from stub children of that zone. This
meant that, in some cases, users could get away with configuring child stubs only in the
master server for the parent zone. BIND 9 never mixes together zone data from different
zones in this way. Therefore, if a BIND 9 master serving a parent zone has child stub
zones configured, all the slave servers for the parent zone also need to have the same child
stub zones configured. Stub zones can also be used to force the resolution of a given domain
to use a particular set of authoritative servers. For example, the caching name servers on a
private network using RFC2157 addressing may be configured with stub zones for 10.in-
addr.arpa to use a set of internal name servers as the authoritative servers for that
domain.
forward A forward zone can be used to configure forwarding on a per-domain basis. A zone state-
ment of type forward can contain a forward and/or forwarders statement, which will apply
to queries within the domain given by the zone name. If no forwarders statement is
present or an empty list for forwarders is given, then no forwarding will be done for the
domain, canceling the effects of any forwarders in the options statement. Thus if you want
to use this type of zone to change the behavior of the global forward option (that is, "for-
ward first to", then "forward only", or vice versa, but want to use the same servers as set
globally) you need to re-specify the global forwarders.
hint The initial set of root nameservers is specified using a hint zone. When the server starts
up, it uses the root hints to find a root nameserver and get the most recent list of root
nameservers. If no hint zone is specified for class IN, the server uses a compiled-in default
set of root servers hints. Classes other than IN have no built-in defaults hints.
Class
The zone’s name may optionally be followed by a class. If a class is not specified, class IN (for Internet), is
assumed. This is correct for the vast majority of cases. The "hesiod" class is named for an information ser-
vice from MIT’s Project Athena. It is used to share information about various systems databases, such as
users, groups, printers and so on. The keyword HS is a synonym for hesiod. Another MIT development is
CHAOSnet, a LAN protocol created in the mid-1970s. Zone data for it can be specified with the CHAOS
class.
Zone Options
allow-notify
See the description of allow-notify.
HP-UX 11i Version 2: December 2007 Update − 20 − Hewlett-Packard Company 227