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NSUPDATE(1)                          BIND9                         NSUPDATE(1)



NAME
       nsupdate - Dynamic DNS update utility

SYNOPSIS
       nsupdate [-d] [-D] [[-g] | [-o] | [-l] | [-y [hmac:]keyname:secret] | [-k keyfile]]
                [-t timeout] [-u udptimeout] [-r udpretries] [-R randomdev] [-v]
                [filename]

DESCRIPTION
       nsupdate is used to submit Dynamic DNS Update requests as defined in RFC 2136 to a
       name server. This allows resource records to be added or removed from a zone
       without manually editing the zone file. A single update request can contain
       requests to add or remove more than one resource record.

       Zones that are under dynamic control via nsupdate or a DHCP server should not be
       edited by hand. Manual edits could conflict with dynamic updates and cause data to
       be lost.

       The resource records that are dynamically added or removed with nsupdate have to be
       in the same zone. Requests are sent to the zone?s master server. This is identified
       by the MNAME field of the zone?s SOA record.

       The -d option makes nsupdate operate in debug mode. This provides tracing
       information about the update requests that are made and the replies received from
       the name server.

       The -D option makes nsupdate report additional debugging information to -d.

       The -L option with an integer argument of zero or higher sets the logging debug
       level. If zero, logging is disabled.

       Transaction signatures can be used to authenticate the Dynamic DNS updates. These
       use the TSIG resource record type described in RFC 2845 or the SIG(0) record
       described in RFC 2535 and RFC 2931 or GSS-TSIG as described in RFC 3645. TSIG
       relies on a shared secret that should only be known to nsupdate and the name
       server. Ensure that you select the appropriate algorithms for the applications as
       well as the key when authenticating each other. For instance, suitable key and
       server statements would be added to /etc/named.conf so that the name server can
       associate the appropriate secret key and algorithm with the IP address of the
       client application that will be using TSIG authentication. SIG(0) uses public key
       cryptography. To use a SIG(0) key, the public key must be stored in a KEY record in
       a zone served by the name server.  nsupdate does not read /etc/named.conf.

       GSS-TSIG uses Kerberos credentials. Standard GSS-TSIG mode is switched on with the
       -g flag. A non-standards-compliant variant of GSS-TSIG used by Windows 2000 can be
       switched on with the -o flag.

       nsupdate uses the -y or -k option to provide the shared secret needed to generate a
       TSIG record for authenticating Dynamic DNS update requests, default type HMAC-MD5.
       These options are mutually exclusive.

       When the -y option is used, a signature is generated from [hmac:]keyname:secret.
       keyname is the name of the key, and secret is the base64 encoded shared secret. Use
       of the -y option is discouraged because the shared secret is supplied as a command
       line argument in clear text. This may be visible in the output from ps(1) or in a
       history file maintained by the user?s shell.

       With the -k option, nsupdate reads the shared secret from the file keyfile.
       Keyfiles may be in two formats: a single file containing a named.conf-format key
       statement, which may be generated automatically by ddns-confgen, or a pair of files
       whose names are of the format K{name}.+157.+{random}.key and
       K{name}.+157.+{random}.private, which can be generated by dnssec-keygen. The -k may
       also be used to specify a SIG(0) key used to authenticate Dynamic DNS update
       requests. In this case, the key specified is not an HMAC-MD5 key.

       nsupdate can be run in a local-host only mode using the -l flag. This sets the
       server address to localhost (disabling the server so that the server address cannot
       be overridden). Connections to the local server will use a TSIG key found in
       /var/run/named/session.key, which is automatically generated by named if any local
       master zone has set update-policy to local. The location of this key file can be
       overridden with the -k option.

       By default, nsupdate uses UDP to send update requests to the name server unless
       they are too large to fit in a UDP request in which case TCP will be used. The -v
       option makes nsupdate use a TCP connection. This may be preferable when a batch of
       update requests is made.

       The -p sets the default port number to use for connections to a name server. The
       default is 53.

       The -t option sets the maximum time an update request can take before it is
       aborted. The default is 300 seconds. Zero can be used to disable the timeout.

       The -u option sets the UDP retry interval. The default is 3 seconds. If zero, the
       interval will be computed from the timeout interval and number of UDP retries.

       The -r option sets the number of UDP retries. The default is 3. If zero, only one
       update request will be made.

       The -R randomdev option specifies a source of randomness. If the operating system
       does not provide a /dev/random or equivalent device, the default source of
       randomness is keyboard input.  randomdev specifies the name of a character device
       or file containing random data to be used instead of the default. The special value
       keyboard indicates that keyboard input should be used. This option may be specified
       multiple times.

INPUT FORMAT
       nsupdate reads input from filename or standard input. Each command is supplied on
       exactly one line of input. Some commands are for administrative purposes. The
       others are either update instructions or prerequisite checks on the contents of the
       zone. These checks set conditions that some name or set of resource records (RRset)
       either exists or is absent from the zone. These conditions must be met if the
       entire update request is to succeed. Updates will be rejected if the tests for the
       prerequisite conditions fail.

       Every update request consists of zero or more prerequisites and zero or more
       updates. This allows a suitably authenticated update request to proceed if some
       specified resource records are present or missing from the zone. A blank input line
       (or the send command) causes the accumulated commands to be sent as one Dynamic DNS
       update request to the name server.

       The command formats and their meaning are as follows:

       server {servername} [port]
           Sends all dynamic update requests to the name server servername. When no server
           statement is provided, nsupdate will send updates to the master server of the
           correct zone. The MNAME field of that zone?s SOA record will identify the
           master server for that zone.  port is the port number on servername where the
           dynamic update requests get sent. If no port number is specified, the default
           DNS port number of 53 is used.

       local {address} [port]
           Sends all dynamic update requests using the local address. When no local
           statement is provided, nsupdate will send updates using an address and port
           chosen by the system.  port can additionally be used to make requests come from
           a specific port. If no port number is specified, the system will assign one.

       zone {zonename}
           Specifies that all updates are to be made to the zone zonename. If no zone
           statement is provided, nsupdate will attempt determine the correct zone to
           update based on the rest of the input.

       class {classname}
           Specify the default class. If no class is specified, the default class is IN.

       ttl {seconds}
           Specify the default time to live for records to be added. The value none will
           clear the default ttl.

       key {name} {secret}
           Specifies that all updates are to be TSIG-signed using the keyname keysecret
           pair. The key command overrides any key specified on the command line via -y or
           -k.

       gsstsig
           Use GSS-TSIG to sign the updated. This is equivalent to specifying -g on the
           commandline.

       oldgsstsig
           Use the Windows 2000 version of GSS-TSIG to sign the updated. This is
           equivalent to specifying -o on the commandline.

       realm {[realm_name]}
           When using GSS-TSIG use realm_name rather than the default realm in krb5.conf.
           If no realm is specified the saved realm is cleared.

       prereq nxdomain {domain-name}
           Requires that no resource record of any type exists with name domain-name.

       prereq yxdomain {domain-name}
           Requires that domain-name exists (has as at least one resource record, of any
           type).

       prereq nxrrset {domain-name} [class] {type}
           Requires that no resource record exists of the specified type, class and
           domain-name. If class is omitted, IN (internet) is assumed.

       prereq yxrrset {domain-name} [class] {type}
           This requires that a resource record of the specified type, class and
           domain-name must exist. If class is omitted, IN (internet) is assumed.

       prereq yxrrset {domain-name} [class] {type} {data...}
           The data from each set of prerequisites of this form sharing a common type,
           class, and domain-name are combined to form a set of RRs. This set of RRs must
           exactly match the set of RRs existing in the zone at the given type, class, and
           domain-name. The data are written in the standard text representation of the
           resource record?s RDATA.

       update delete {domain-name} [ttl] [class] [type [data...]]
           Deletes any resource records named domain-name. If type and data is provided,
           only matching resource records will be removed. The internet class is assumed
           if class is not supplied. The ttl is ignored, and is only allowed for
           compatibility.

       update add {domain-name} {ttl} [class] {type} {data...}
           Adds a new resource record with the specified ttl, class and data.

       show
           Displays the current message, containing all of the prerequisites and updates
           specified since the last send.

       send
           Sends the current message. This is equivalent to entering a blank line.

       answer
           Displays the answer.

       debug
           Turn on debugging.

       Lines beginning with a semicolon are comments and are ignored.

EXAMPLES
       The examples below show how nsupdate could be used to insert and delete resource
       records from the example.com zone. Notice that the input in each example contains a
       trailing blank line so that a group of commands are sent as one dynamic update
       request to the master name server for example.com.

           # nsupdate
           > update delete oldhost.example.com A
           > update add newhost.example.com 86400 A 172.16.1.1
           > send

       Any A records for oldhost.example.com are deleted. And an A record for
       newhost.example.com with IP address 172.16.1.1 is added. The newly-added record has
       a 1 day TTL (86400 seconds).

           # nsupdate
           > prereq nxdomain nickname.example.com
           > update add nickname.example.com 86400 CNAME somehost.example.com
           > send

       The prerequisite condition gets the name server to check that there are no resource
       records of any type for nickname.example.com. If there are, the update request
       fails. If this name does not exist, a CNAME for it is added. This ensures that when
       the CNAME is added, it cannot conflict with the long-standing rule in RFC 1034 that
       a name must not exist as any other record type if it exists as a CNAME. (The rule
       has been updated for DNSSEC in RFC 2535 to allow CNAMEs to have RRSIG, DNSKEY and
       NSEC records.)

FILES
       /etc/resolv.conf
           used to identify default name server

       /var/run/named/session.key
           sets the default TSIG key for use in local-only mode

       K{name}.+157.+{random}.key
           base-64 encoding of HMAC-MD5 key created by dnssec-keygen(8).

       K{name}.+157.+{random}.private
           base-64 encoding of HMAC-MD5 key created by dnssec-keygen(8).

SEE ALSO
       RFC 2136, RFC 3007, RFC 2104, RFC 2845, RFC 1034, RFC 2535, RFC 2931, named(8),
       ddns-confgen(8), dnssec-keygen(8).

BUGS
       The TSIG key is redundantly stored in two separate files. This is a consequence of
       nsupdate using the DST library for its cryptographic operations, and may change in
       future releases.

COPYRIGHT
       Copyright (C) 2004-2010 Internet Systems Consortium, Inc. ("ISC")
       Copyright (C) 2000-2003 Internet Software Consortium.



BIND9                            Aug 25, 2009                      NSUPDATE(1)

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