Chapter 16. Berkeley Internet Name Domain (BIND)
233
allow recursion
  Similar to
allow query
, except it applies to recursive queries. By de 
fault, all hosts are allowed to perform recursive queries on the nameserver.
directory
  Changes the
named
working directory to something other than the default,
/var/named
.
forward
  Controls how forwarding occurs, if the
forwarders
option contains valid IP ad 
dresses designating where to send requests.
If the
first
option is used, then the nameservers specified in the
forwarders
option are queried
first for the information, and if they do not have it,
named
will attempt the resolution itself.
If the
only
option is used,
named
will not attempt the resolution itself if the forwarders are not
successful.
forwarders
  Specifies a list of nameservers where requests should be forwarded for resolu 
tion.
listen on
  Specifies the network interface that
named
will use to listen for queries. By
default, all interfaces are used.
This option is useful if you have more than one network interface and would like to limit the
systems that can make requests of your nameserver. For example, if you have a machine serving
as a gateway and a nameserver, and you would like to block any requests except those that
originate from your private network, your
listen on
option might look like this:
options {
listen on { 10.0.1.1; };
};
In this way, only requests that arrive from the network interface serving the private network
(
10.0.1.1
) will be accepted.
notify
  Controls whether
named
notifies the slave servers when a zone is updated. The default
is
yes
, but you can set this to
no
, to prevent slaves from being notified, or
explicit
, to only
notify servers in an
also notify
list.
pid file
  Allows you to specify the location of the process ID file created by
named
when
it starts.
statistics file
  Allows you to specify the location of where the statistics file is written.
By default,
named
statistics are saved in
/var/named/named.stats
.
Dozens of other options are also available, many of which rely upon one another to work properly.
See the BIND 9 Administrator Reference Manual for more details.
  server
  Defines particular options that affect how
named
should act toward remote nameservers,
especially regarding notifications and zone transfers.
The
transfer format
option controls whether one resource record is sent with each message
(
one answer
) or multiple resource records are sent with each message (
many answers
). While
many answers
is more efficient, only newer BIND nameservers understand it.
  trusted keys
  Contains assorted public keys used for DNSSEC. See Section 16.4.3 for an
introduction to BIND security.
  view " view name "
  Creates special views that respond with a particular type of informa 
A
tion depending upon the host contacting the nameserver. This allows some hosts to receive one
answer regarding a particular zone while other hosts receive totally different information. Alterna 
tively, certain zones may only be made available to particular trusted hosts while non trusted hosts
can only make queries for other zones.
Multiple views may be used, so long as their names are unique. The
match clients
option spec 
ifies the IP addresses that apply to a particular view. Any
option
statements may also be used
within a view, overriding the global options already configured for
named
. Most
view
statements
contain multiple
zone
statements that apply to the
match clients
list. The order in which
view






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