BSD 4_3_Net_2 release

[unix-history] / usr / src / usr.sbin / named / named.8

diff --git a/usr/src/usr.sbin/named/named.8 b/usr/src/usr.sbin/named/named.8
index e976f6f..2d506c4 100644 (file)
--- a/usr/src/usr.sbin/named/named.8
+++ b/usr/src/usr.sbin/named/named.8
@@ -1,105 +1,130 @@
-.\" Copyright (c) 1985 The Regents of the University of California.
+.\" Copyright (c) 1985, 1991 The Regents of the University of California.

 .\" All rights reserved.
 .\"
 .\" All rights reserved.
 .\"

-.\" Redistribution and use in source and binary forms are permitted provided
-.\" that: (1) source distributions retain this entire copyright notice and
-.\" comment, and (2) distributions including binaries display the following
-.\" acknowledgement:  ``This product includes software developed by the
-.\" University of California, Berkeley and its contributors'' in the
-.\" documentation or other materials provided with the distribution and in
-.\" all advertising materials mentioning features or use of this software.
-.\" Neither the name of the University nor the names of its contributors may
-.\" be used to endorse or promote products derived from this software without
-.\" specific prior written permission.
-.\" THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
-.\" WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
-.\" MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 3. All advertising materials mentioning features or use of this software
+.\"    must display the following acknowledgement:
+.\"    This product includes software developed by the University of
+.\"    California, Berkeley and its contributors.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.

 .\"
 .\"

-.\"    @(#)named.8     6.8 (Berkeley) 6/24/90
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.

 .\"
 .\"

-.TH NAMED 8 "June 24, 1990"
-.UC 4
-.SH NAME
-named \- Internet domain name server
-.SH SYNOPSIS
-.B named
-[
-.B \-d
-.I debuglevel
-] [
-.B \-p
-.I port#
-] [{\-b}
-.I bootfile
-]
-.SH DESCRIPTION
-.I Named
+.\"     @(#)named.8    6.9 (Berkeley) 3/16/91
+.\"
+.Dd March 16, 1991
+.Dt NAMED 8
+.Os BSD 4
+.Sh NAME
+.Nm named
+.Nd Internet domain name server
+.Sh SYNOPSIS
+.Nm named
+.Op Fl d Ar debuglevel
+.Op Fl p Ar port#
+.Oo Op Fl b
+.Ar bootfile Oc
+.Sh DESCRIPTION
+.Nm Named

 is the Internet domain name server.
 is the Internet domain name server.

-See RFC883 for more information on the Internet name-domain system.
+See
+.%T RFC883
+for more information on the Internet name-domain system.

 Without any arguments,
 Without any arguments,

-.I named
+.Nm named

 will read the default boot file
 will read the default boot file

-.IR /etc/named.boot ,
+.Pa /etc/named.boot ,

 read any initial data and listen for queries.
 read any initial data and listen for queries.

-.PP
+.Pp

 Options are:
 Options are:

-.TP
-.B \-d
+.Bl -tag -width Ds
+.It Fl d

 Print debugging information.
 Print debugging information.

-A number after the ``d'' determines the level of
+A number after the
+.Fl d
+determines the level of

 messages printed.
 messages printed.

-.TP
-.B \-p
+.It Fl p

 Use a different port number.  The default is the standard port number
 Use a different port number.  The default is the standard port number

-as listed in /etc/services.
-.TP
-.B \-b
+as listed in
+.Pa /etc/services .
+.It Fl b

 Use an alternate boot file.  This is optional and allows you to
 specify a file with a leading dash.
 Use an alternate boot file.  This is optional and allows you to
 specify a file with a leading dash.

-.PP
+.El
+.Pp

 Any additional argument is taken as the name of the boot file.
 The boot file contains information about where the name server is to get
 its initial data.  If multiple boot files are specified, only the last
 is used.
 Lines in the boot file cannot be continued on subsequent lines.
 The following is a small example:
 Any additional argument is taken as the name of the boot file.
 The boot file contains information about where the name server is to get
 its initial data.  If multiple boot files are specified, only the last
 is used.
 Lines in the boot file cannot be continued on subsequent lines.
 The following is a small example:

-.in +2m
-.nf
-
+.Bd -literal

 ;
 ;      boot file for name server
 ;
 ;
 ;      boot file for name server
 ;

-directory      /usr/local/domain
+directory      /etc/namedb

 
 

-.ta \w'forwarders\ 'u +\w'6.32.128.IN-ADDR.ARPA\ 'u +\w'128.32.137.8 128.32.137.3\ 'u
-; type domain  source host/file                                backup file
+; type domain  source host/file                      backup file

 
 

-cache  .                                                       root.cache
-primary        Berkeley.EDU    berkeley.edu.zone
-primary        32.128.IN-ADDR.ARPA     ucbhosts.rev
-secondary      CC.Berkeley.EDU 128.32.137.8 128.32.137.3       cc.zone.bak
-secondary      6.32.128.IN-ADDR.ARPA   128.32.137.8 128.32.137.3       cc.rev.bak
-primary        0.0.127.IN-ADDR.ARPA                                    localhost.rev
-forwarders     10.0.0.78 10.2.0.78
+cache  .                                             root.cache
+primary   Berkeley.EDU          berkeley.edu.zone
+primary   32.128.IN-ADDR.ARPA   ucbhosts.rev
+secondary CC.Berkeley.EDU 128.32.137.8 128.32.137.3 cc.zone.bak
+secondary 6.32.128.IN-ADDR.ARPA 128.32.137.8 128.32.137.3 cc.rev.bak
+primary   0.0.127.IN-ADDR.ARPA localhost.rev
+forwarders 10.0.0.78 10.2.0.78

 ; slave
 ; slave

-
-.DT
-.fi
-.in
+.Ed
+.Pp

 The ``directory'' line causes the server to change its
 working directory to the directory specified.  This can
 The ``directory'' line causes the server to change its
 working directory to the directory specified.  This can

-be important for the correct processing of $INCLUDE files
+be important for the correct processing of
+.Li $INCLUDE
+files

 in primary zone files.
 in primary zone files.

-.LP
-The ``cache'' line specifies that data in ``root.cache'' is to be
+.Pp
+The
+.Dq cache
+line specifies that data in
+.Dq Pa root.cache
+is to be

 placed in the backup cache.
 Its main use is to specify data such as locations of root domain servers.
 This cache is not used during normal operation,
 placed in the backup cache.
 Its main use is to specify data such as locations of root domain servers.
 This cache is not used during normal operation,

-but is used as ``hints'' to find the current root servers.
-The file ``root.cache'' is in the same format as ``berkeley.edu.zone''.
-There can be more than one ``cache'' file specified.
+but is used as
+.Dq hints
+to find the current root servers.
+The file
+.Dq Pa root.cache
+is in the same format as
+.Dq Pa berkeley.edu.zone .
+There can be more than one
+.Dq cache
+file specified.

 .\"The first such file will be updated under certain conditions to snapshot the
 .\"The first such file will be updated under certain conditions to snapshot the

-.\"cache (see SIGQUIT below).
+.\"cache (see
+.\" .Dv SIGQUIT
+.\" below).

 .\"The cache line can also have an optional interval argument after
 .\"the filename.
 .\"If an interval is listed,
 .\"The cache line can also have an optional interval argument after
 .\"the filename.
 .\"If an interval is listed,


@@ -118,21 +143,41 @@ The cache files are processed in such a way as to preserve the
 time-to-live's
 of data dumped out.  Data for the root nameservers is kept artificially
 valid if necessary.
 time-to-live's
 of data dumped out.  Data for the root nameservers is kept artificially
 valid if necessary.

-.LP
-The first ``primary'' line states that the file ``berkeley.edu.zone'' contains
-authoritative data for the ``Berkeley.EDU'' zone.
-The file ``berkeley.edu.zone''
-contains data in the master file format described in RFC883.
+.Pp
+The first
+.Dq primary
+line states that the file
+.Dq Pa berkeley.edu.zone
+contains
+authoritative data for the
+.Dq Berkeley. Ns Em EDU
+zone.
+The file
+.Dq Pa berkeley.edu.zone
+contains data in the master file format described in
+.%T RFC883 .

 All domain names are relative to the origin, in this
 All domain names are relative to the origin, in this

-case, ``Berkeley.EDU'' (see below for a more detailed description).
-The second ``primary'' line states that the file ``ucbhosts.rev'' contains
-authoritative data for the domain ``32.128.IN-ADDR.ARPA,'' which is used
+case,
+.Dq Berkeley. Ns Em EDU
+(see below for a more detailed description).
+The second
+.Dq primary
+line states that the file
+.Dq Pa ucbhosts.rev
+contains
+authoritative data for the domain
+.Dq 32.128.IN-ADDR.ARPA ,
+which is used

 to translate addresses in network 128.32 to hostnames.
 to translate addresses in network 128.32 to hostnames.

-Each master file should begin with an SOA record for the zone
+Each master file should begin with an
+.Tn SOA
+record for the zone

 (see below).
 (see below).

-.LP
+.Pp

 The first ``secondary'' line specifies that all authoritative data
 The first ``secondary'' line specifies that all authoritative data

-under ``CC.Berkeley.EDU'' is to be transferred from the name server
+under
+.Dq CC.Berkeley. Ns Em EDU
+is to be transferred from the name server

 at 128.32.137.8.  If the transfer fails it will try 128.32.137.3 and
 continue trying the addresses, up to 10, listed on this line.
 The secondary copy is also authoritative for the specified domain.
 at 128.32.137.8.  If the transfer fails it will try 128.32.137.3 and
 continue trying the addresses, up to 10, listed on this line.
 The secondary copy is also authoritative for the specified domain.


@@ -143,11 +188,15 @@ when it boots, providing a complete copy even if the master servers
 are unreachable.
 Whenever a new copy of the domain is received by automatic zone transfer
 from one of the master servers, this file will be updated.
 are unreachable.
 Whenever a new copy of the domain is received by automatic zone transfer
 from one of the master servers, this file will be updated.

-The second ``secondary'' line states that the address-to-hostname
+The second
+.Dq secondary
+line states that the address-to-hostname

 mapping for the subnet 128.32.136 should be obtained from the same list
 of master servers as the previous zone.
 mapping for the subnet 128.32.136 should be obtained from the same list
 of master servers as the previous zone.

-.LP
-The ``forwarders'' line specifies the addresses of sitewide servers
+.Pp
+The
+.Dq forwarders
+line specifies the addresses of sitewide servers

 that will accept recursive queries from other servers.
 If the boot file specifies one or more forwarders, then the
 server will send all queries for data not in the cache to the forwarders first.
 that will accept recursive queries from other servers.
 If the boot file specifies one or more forwarders, then the
 server will send all queries for data not in the cache to the forwarders first.


@@ -161,14 +210,14 @@ and to reduce traffic over links to outside servers.
 It can also be used to allow servers to run that do not have
 access directly to the Internet, but wish to act as though
 they do.
 It can also be used to allow servers to run that do not have
 access directly to the Internet, but wish to act as though
 they do.

-.LP
+.Pp

 The ``slave'' line (shown commented out) is used to put the server
 in slave mode.  In this mode, the server will only make queries to
 forwarders.  This option is normally used on machine that wish to
 run a server but for physical or administrative reasons cannot
 be given access to the Internet, but have access to a host that
 does have access.
 The ``slave'' line (shown commented out) is used to put the server
 in slave mode.  In this mode, the server will only make queries to
 forwarders.  This option is normally used on machine that wish to
 run a server but for physical or administrative reasons cannot
 be given access to the Internet, but have access to a host that
 does have access.

-.LP
+.Pp

 The ``sortlist'' line can be used to indicate networks that are to be
 preferred over other, unlisted networks.
 Queries for host addresses from hosts on the same network as the server
 The ``sortlist'' line can be used to indicate networks that are to be
 preferred over other, unlisted networks.
 Queries for host addresses from hosts on the same network as the server


@@ -176,99 +225,117 @@ will receive responses with local network addresses listed first,
 then addresses on the sort list, then other addresses.
 This line is only acted on at initial startup.
 When reloading the nameserver with
 then addresses on the sort list, then other addresses.
 This line is only acted on at initial startup.
 When reloading the nameserver with

-a SIGHUP, this line will be ignored.
-.PP
+a
+.Dv SIGHUP ,
+this line will be ignored.
+.Pp

 The master file consists of control information
 and a list of resource records for objects in the zone
 of the forms:
 The master file consists of control information
 and a list of resource records for objects in the zone
 of the forms:

-.RS
-.nf
-
+.Bd -literal

 $INCLUDE <filename> <opt_domain>
 $ORIGIN <domain>
 <domain> <opt_ttl> <opt_class> <type> <resource_record_data>
 $INCLUDE <filename> <opt_domain>
 $ORIGIN <domain>
 <domain> <opt_ttl> <opt_class> <type> <resource_record_data>

-
-.fi
-.RE
+.Ed
+.Pp

 where
 where

-.I domain
-is "." for root, "@" for the current origin, or a standard domain
+.Em domain
+is
+.Ql \&.
+for root,
+.Ql \&@
+for the current origin, or a standard domain

 name. If
 name. If

-.I domain
-is a standard domain name that does not end with ``.'', the current origin
-is appended to the domain. Domain names ending with ``.'' are
+.Em domain
+is a standard domain name that does not end with
+.Ql \&. ,
+the current origin
+is appended to the domain. Domain names ending with
+.Ql \&.
+are

 unmodified.
 The
 unmodified.
 The

-.I opt_domain
+.Em opt_domain

 field is used to define an origin for the data in an included file.
 field is used to define an origin for the data in an included file.

-It is equivalent to placing a $ORIGIN statement before the first
+It is equivalent to placing a
+.Li $ORIGIN
+statement before the first

 line of the included file.  The field is optional.
 Neither the
 line of the included file.  The field is optional.
 Neither the

-.I opt_domain
-field nor $ORIGIN statements in the included file modify the current origin
+.Em opt_domain
+field nor
+.Li $ORIGIN
+statements in the included file modify the current origin

 for this file.
 The
 for this file.
 The

-.I opt_ttl
+.Em opt_ttl

 field is an optional integer number for the time-to-live field.
 field is an optional integer number for the time-to-live field.

-It defaults to zero, meaning the minimum value specified in the SOA
-record for the zone.
+It defaults to zero, meaning the minimum value specified in the
+SOA record for the zone.

 The
 The

-.I opt_class
+.Em opt_class

 field is the object address type; currently only one type is supported,
 field is the object address type; currently only one type is supported,

-.BR IN ,
-for objects connected to the DARPA Internet. 
+.Sy IN ,
+for objects connected to the
+.Tn DARPA
+Internet. 

 The
 The

-.I type
+.Em type

 field contains one of the following tokens; the data expected in the
 field contains one of the following tokens; the data expected in the

-.I resource_record_data
+.Em resource_record_data

 field is in parentheses.
 field is in parentheses.

-.TP "\w'MINFO    'u"
-A
+.Bl -tag -width Fl
+.It A

 a host address (dotted quad)
 a host address (dotted quad)

-.IP NS
+.It \&NS

 an authoritative name server (domain)
 an authoritative name server (domain)

-.IP MX
+.It \&MX

 a mail exchanger (domain)
 a mail exchanger (domain)

-.IP CNAME
+.It CNAME

 the canonical name for an alias (domain)
 the canonical name for an alias (domain)

-.IP SOA
+.It SOA

 marks the start of a zone of authority (domain of originating host,
 domain address of maintainer, a serial number and the following
 marks the start of a zone of authority (domain of originating host,
 domain address of maintainer, a serial number and the following

-parameters in seconds: refresh, retry, expire and minimum TTL (see RFC883))
-.IP MB
+parameters in seconds: refresh, retry, expire and minimum TTL
+(see
+.%T RFC883 ) )
+.It \&MB

 a mailbox domain name (domain)
 a mailbox domain name (domain)

-.IP MG
+.It \&MG

 a mail group member (domain)
 a mail group member (domain)

-.IP MR
+.It \&MR

 a mail rename domain name (domain)
 a mail rename domain name (domain)

-.IP NULL
-a null resource record (no format or data)
-.IP WKS
+.It NULL
+ra null resource record (no format or data)
+.It \&WKS

 a well know service description (not implemented yet)
 a well know service description (not implemented yet)

-.IP PTR
+.It \&PTR

 a domain name pointer (domain)
 a domain name pointer (domain)

-.IP HINFO
-host information (cpu_type OS_type)
-.IP MINFO
+.It HINFO
+host information (cpu_type OS_type )
+.It MINFO

 mailbox or mail list information (request_domain error_domain)
 mailbox or mail list information (request_domain error_domain)

-.PP
+.El
+.Pp

 Resource records normally end at the end of a line,
 but may be continued across lines between opening and closing parentheses.
 Comments are introduced by semicolons and continue to the end of the line.
 Resource records normally end at the end of a line,
 but may be continued across lines between opening and closing parentheses.
 Comments are introduced by semicolons and continue to the end of the line.

-.PP
-Each master zone file should begin with an SOA record for the zone.
-An example SOA record is as follows:
-.LP
-.nf
-@      IN      SOA     ucbvax.Berkeley.EDU. rwh.ucbvax.Berkeley.EDU. (
-                               2.89    ; serial
-                               10800   ; refresh
-                               3600    ; retry
-                               3600000 ; expire
-                               86400 ) ; minimum
-.fi
-.LP
-The SOA lists a serial number, which should be changed each time the master
+.Pp
+Each master zone file should begin with an SOA
+record for the zone.
+An example SOA
+record is as follows:
+.Bd -literal
+@  IN  SOA  ucbvax.Berkeley.EDU. rwh.ucbvax.Berkeley.EDU. (
+                             2.89      ; serial
+                             10800     ; refresh
+                             3600      ; retry
+                             3600000   ; expire
+                             86400 )   ; minimum
+.Ed
+.Pp
+The SOA
+lists a serial number, which should be changed each time the master

 file is changed.
 Secondary servers check the serial number at intervals specified by the refresh
 time in seconds; if the serial number changes, a zone transfer will be done
 file is changed.
 Secondary servers check the serial number at intervals specified by the refresh
 time in seconds; if the serial number changes, a zone transfer will be done


@@ -279,49 +346,94 @@ If a master server cannot be contacted within the interval given by the
 expire time, all data from the zone is discarded by secondary servers.
 The minimum value is the time-to-live used by records in the file
 with no explicit time-to-live value.
 expire time, all data from the zone is discarded by secondary servers.
 The minimum value is the time-to-live used by records in the file
 with no explicit time-to-live value.

-.SH NOTES
+.Sh NOTES

 The boot file directives ``domain'' and ``suffixes'' have been
 obsoleted by a more useful resolver based implementation of
 suffixing for partially qualified domain names.  The prior mechanisms
 could fail under a number of situations, especially when then local
 nameserver did not have complete information.
 The boot file directives ``domain'' and ``suffixes'' have been
 obsoleted by a more useful resolver based implementation of
 suffixing for partially qualified domain names.  The prior mechanisms
 could fail under a number of situations, especially when then local
 nameserver did not have complete information.

-.sp
+.Pp

 The following signals have the specified effect when sent to the
 server process using the
 The following signals have the specified effect when sent to the
 server process using the

-.IR kill (1)
+.Xr kill 1

 command.
 command.

-.IP SIGHUP
-Causes server to read named.boot and reload database.
-.IP SIGINT
-Dumps current data base and cache to /var/tmp/named_dump.db
-.\".IP SIGQUIT
+.Bl -tag -width Fl
+.It Dv SIGHUP
+Causes server to read
+.Pa named.boot
+and reload database.
+.It Dv SIGINT
+Dumps current data base and cache to
+.Pa /var/tmp/named_dump.db
+.\".IP
+.\" .Dv SIGQUIT

 .\"Causes the server to checkpoint the cache into the first ``cache'' file.
 .\"Causes the server to checkpoint the cache into the first ``cache'' file.

-.IP SIGIOT
-Dumps statistics data into /var/tmp/named.stats if the server is
-compiled -DSTATS.  Statistics data is appended to the file.
-.IP SIGSYS
-Dumps the profiling data in /var/tmp if the server is compiled
+.It Dv SIGIOT
+Dumps statistics data into
+.Pa /var/tmp/named.stats
+if the server is
+compiled
+.Dv \-DSTATS .
+Statistics data is appended to the file.
+.It Dv SIGSYS
+Dumps the profiling data in
+.Pa /var/tmp
+if the server is compiled

 with profiling (server forks, chdirs and exits).
 with profiling (server forks, chdirs and exits).

-.IP SIGTERM
+.It Dv SIGTERM

 Dumps the primary and secondary database files.
 Used to save modified data on shutdown if the
 server is compiled with dynamic updating enabled.
 Dumps the primary and secondary database files.
 Used to save modified data on shutdown if the
 server is compiled with dynamic updating enabled.

-.IP SIGUSR1
-Turns on debugging; each SIGUSR1 increments debug level.
-(SIGEMT on older systems without SIGUSR1)
-.IP SIGUSR2
+.It Dv SIGUSR1
+urnsTurns on debugging; each
+.Dv SIGUSR1
+increments debug level.
+.Pf ( Dv SIGEMT
+on older systems without
+.Dv SIGUSR1 )
+.It Dv SIGUSR2

 Turns off debugging completely.
 Turns off debugging completely.

-(SIGFPE on older systems without SIGUSR2)
-.SH FILES
-.nf
-.ta \w'/var/tmp/named_dump.db   'u
-/etc/namedb/named.boot name server configuration boot file
-/var/run/named.pid     the process id
-/var/tmp/named.run     debug output
-/var/tmp/named_dump.db dump of the name server database
-/var/tmp/named.stats   nameserver statistics data
-.fi
-.SH "SEE ALSO"
-kill(1), gethostbyname(3N), signal(3c), resolver(3), resolver(5), hostname(7),
-RFC882, RFC883, RFC973, RFC974,
-\fIName Server Operations Guide for BIND\fR
+.Pf ( Dv SIGFPE
+on older systems without
+.Dv SIGUSR2 )
+.El
+.Sh FILES
+.Bl -tag -width /var/tmp/named_dump.db -compact
+.It Pa /etc/named.boot
+name server configuration boot file
+.It Pa /etc/named.pid
+the process id
+.It Pa /var/tmp/named.run
+debug output
+.It Pa /var/tmp/named_dump.db
+dump of the name server database
+.It Pa /var/tmp/named.stats
+nameserver statistics data
+.El
+.Sh SEE ALSO
+.Xr kill 1 ,
+.Xr gethostbyname 3 ,
+.Xr signal 3 ,
+.Xr resolver 3 ,
+.Xr resolver 5 ,
+.Xr hostname 7 ,
+.Rs
+.%T RFC882
+.Re
+.Rs
+.%T RFC883
+.Re
+.Rs
+.%T RFC973
+.Re
+.Rs
+.%T RFC974
+.Re
+.Rs
+.%T "Name Server Operations Guide for BIND"
+.Re
+.Sh HISTORY
+The
+.Nm
+command appeared in
+.Bx 4.3 .