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046ea4d1ee0f22d956cd360e1e0c0b275aa4bbd0Dav Glass<a name="man.nsupdate"></a><div class="titlepage"></div>
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass<p><span class="application">nsupdate</span> — Dynamic DNS update utility</p>
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass<div class="cmdsynopsis"><p><code class="command">nsupdate</code> [<code class="option">-d</code>] [<code class="option">-D</code>] [[<code class="option">-g</code>] | [<code class="option">-o</code>] | [<code class="option">-l</code>] | [<code class="option">-y <em class="replaceable"><code>[<span class="optional">hmac:</span>]keyname:secret</code></em></code>] | [<code class="option">-k <em class="replaceable"><code>keyfile</code></em></code>]] [<code class="option">-t <em class="replaceable"><code>timeout</code></em></code>] [<code class="option">-u <em class="replaceable"><code>udptimeout</code></em></code>] [<code class="option">-r <em class="replaceable"><code>udpretries</code></em></code>] [<code class="option">-R <em class="replaceable"><code>randomdev</code></em></code>] [<code class="option">-v</code>] [filename]</p></div>
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass<p><span><strong class="command">nsupdate</strong></span>
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass is used to submit Dynamic DNS Update requests as defined in RFC 2136
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass to a name server.
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass This allows resource records to be added or removed from a zone
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass without manually editing the zone file.
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass A single update request can contain requests to add or remove more than
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass resource record.
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass Zones that are under dynamic control via
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass <span><strong class="command">nsupdate</strong></span>
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass or a DHCP server should not be edited by hand.
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass Manual edits could
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass conflict with dynamic updates and cause data to be lost.
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass The resource records that are dynamically added or removed with
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass <span><strong class="command">nsupdate</strong></span>
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass have to be in the same zone.
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass Requests are sent to the zone's master server.
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass This is identified by the MNAME field of the zone's SOA record.
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass option makes
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass <span><strong class="command">nsupdate</strong></span>
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass operate in debug mode.
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass This provides tracing information about the update requests that are
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass made and the replies received from the name server.
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass The <code class="option">-D</code> option makes <span><strong class="command">nsupdate</strong></span>
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass report additional debugging information to <code class="option">-d</code>.
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass The <code class="option">-L</code> option with an integer argument of zero or
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass higher sets the logging debug level. If zero, logging is disabled.
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass Transaction signatures can be used to authenticate the Dynamic
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass DNS updates. These use the TSIG resource record type described
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass in RFC 2845 or the SIG(0) record described in RFC 2535 and
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass RFC 2931 or GSS-TSIG as described in RFC 3645. TSIG relies on
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass a shared secret that should only be known to
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass <span><strong class="command">nsupdate</strong></span> and the name server. Currently,
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass the only supported encryption algorithm for TSIG is HMAC-MD5,
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass which is defined in RFC 2104. Once other algorithms are
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass defined for TSIG, applications will need to ensure they select
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass the appropriate algorithm as well as the key when authenticating
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass each other. For instance, suitable <span class="type">key</span> and
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass <span class="type">server</span> statements would be added to
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass <code class="filename">/etc/named.conf</code> so that the name server
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass can associate the appropriate secret key and algorithm with
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass the IP address of the client application that will be using
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass TSIG authentication. SIG(0) uses public key cryptography.
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass To use a SIG(0) key, the public key must be stored in a KEY
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass record in a zone served by the name server.
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass <span><strong class="command">nsupdate</strong></span> does not read
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass GSS-TSIG uses Kerberos credentials. Standard GSS-TSIG mode
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass is switched on with the <code class="option">-g</code> flag. A
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass non-standards-compliant variant of GSS-TSIG used by Windows
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass 2000 can be switched on with the <code class="option">-o</code> flag.
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass<p><span><strong class="command">nsupdate</strong></span>
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass uses the <code class="option">-y</code> or <code class="option">-k</code> option
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass to provide the shared secret needed to generate a TSIG record
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass for authenticating Dynamic DNS update requests, default type
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass HMAC-MD5. These options are mutually exclusive.
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass When the <code class="option">-y</code> option is used, a signature is
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass generated from
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass [<span class="optional"><em class="parameter"><code>hmac:</code></em></span>]<em class="parameter"><code>keyname:secret.</code></em>
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass <em class="parameter"><code>keyname</code></em> is the name of the key, and
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass <em class="parameter"><code>secret</code></em> is the base64 encoded shared secret.
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass Use of the <code class="option">-y</code> option is discouraged because the
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass shared secret is supplied as a command line argument in clear text.
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass This may be visible in the output from
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass <span class="citerefentry"><span class="refentrytitle">ps</span>(1)</span>
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass or in a history file maintained by the user's shell.
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass <code class="option">-k</code> option, <span><strong class="command">nsupdate</strong></span> reads
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass the shared secret from the file <em class="parameter"><code>keyfile</code></em>.
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass Keyfiles may be in two formats: a single file containing
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass a <code class="filename">named.conf</code>-format <span><strong class="command">key</strong></span>
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass statement, which may be generated automatically by
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass <span><strong class="command">ddns-confgen</strong></span>, or a pair of files whose names are
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass of the format <code class="filename">K{name}.+157.+{random}.key</code> and
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass <code class="filename">K{name}.+157.+{random}.private</code>, which can be
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass generated by <span><strong class="command">dnssec-keygen</strong></span>.
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass The <code class="option">-k</code> may also be used to specify a SIG(0) key used
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass to authenticate Dynamic DNS update requests. In this case, the key
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass specified is not an HMAC-MD5 key.
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass <span><strong class="command">nsupdate</strong></span> can be run in a local-host only mode
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass using the <code class="option">-l</code> flag. This sets the server address to
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass localhost (disabling the <span><strong class="command">server</strong></span> so that the server
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass address cannot be overridden). Connections to the local server will
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass use a TSIG key found in <code class="filename">/var/run/named/session.key</code>,
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass which is automatically generated by <span><strong class="command">named</strong></span> if any
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass local master zone has set <span><strong class="command">update-policy</strong></span> to
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass <span><strong class="command">local</strong></span>. The location of this key file can be
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass overridden with the <code class="option">-k</code> option.
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass By default, <span><strong class="command">nsupdate</strong></span>
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass uses UDP to send update requests to the name server unless they are too
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass large to fit in a UDP request in which case TCP will be used.
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass option makes
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass <span><strong class="command">nsupdate</strong></span>
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass use a TCP connection.
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass This may be preferable when a batch of update requests is made.
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass The <code class="option">-p</code> sets the default port number to use for
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass connections to a name server. The default is 53.
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass The <code class="option">-t</code> option sets the maximum time an update request
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass take before it is aborted. The default is 300 seconds. Zero can be
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass to disable the timeout.
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass The <code class="option">-u</code> option sets the UDP retry interval. The default
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass 3 seconds. If zero, the interval will be computed from the timeout
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass and number of UDP retries.
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass The <code class="option">-r</code> option sets the number of UDP retries. The
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass 3. If zero, only one update request will be made.
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass The <code class="option">-R <em class="replaceable"><code>randomdev</code></em></code> option
046ea4d1ee0f22d956cd360e1e0c0b275aa4bbd0Dav Glass specifies a source of randomness. If the operating system
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass does not provide a <code class="filename">/dev/random</code> or
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass equivalent device, the default source of randomness is keyboard
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass input. <code class="filename">randomdev</code> specifies the name of
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass a character device or file containing random data to be used
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass instead of the default. The special value
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass <code class="filename">keyboard</code> indicates that keyboard input
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass should be used. This option may be specified multiple times.
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass<p><span><strong class="command">nsupdate</strong></span>
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass reads input from
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass or standard input.
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass Each command is supplied on exactly one line of input.
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass Some commands are for administrative purposes.
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass The others are either update instructions or prerequisite checks on the
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass contents of the zone.
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass These checks set conditions that some name or set of
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass resource records (RRset) either exists or is absent from the zone.
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass These conditions must be met if the entire update request is to succeed.
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass Updates will be rejected if the tests for the prerequisite conditions
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass Every update request consists of zero or more prerequisites
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass and zero or more updates.
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass This allows a suitably authenticated update request to proceed if some
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass specified resource records are present or missing from the zone.
046ea4d1ee0f22d956cd360e1e0c0b275aa4bbd0Dav Glass A blank input line (or the <span><strong class="command">send</strong></span> command)
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass accumulated commands to be sent as one Dynamic DNS update request to the
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass name server.
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass The command formats and their meaning are as follows:
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass <span><strong class="command">server</strong></span>
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass {servername}
5c5f5643ee2dfbf7de92a5beb9d3de882cebdbf9Dav Glass Sends all dynamic update requests to the name server
046ea4d1ee0f22d956cd360e1e0c0b275aa4bbd0Dav Glass <em class="parameter"><code>servername</code></em>.
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass When no server statement is provided,
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass <span><strong class="command">nsupdate</strong></span>
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass will send updates to the master server of the correct zone.
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass The MNAME field of that zone's SOA record will identify the
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass server for that zone.
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass is the port number on
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass <em class="parameter"><code>servername</code></em>
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass where the dynamic update requests get sent.
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass If no port number is specified, the default DNS port number of
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass <span><strong class="command">local</strong></span>
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass Sends all dynamic update requests using the local
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass When no local statement is provided,
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass <span><strong class="command">nsupdate</strong></span>
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass will send updates using an address and port chosen by the
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass can additionally be used to make requests come from a specific
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass If no port number is specified, the system will assign one.
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass <span><strong class="command">zone</strong></span>
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass Specifies that all updates are to be made to the zone
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass statement is provided,
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass <span><strong class="command">nsupdate</strong></span>
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass will attempt determine the correct zone to update based on the
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass rest of the input.
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass <span><strong class="command">class</strong></span>
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass Specify the default class.
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass If no <em class="parameter"><code>class</code></em> is specified, the
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass default class is
046ea4d1ee0f22d956cd360e1e0c0b275aa4bbd0Dav Glass Specify the default time to live for records to be added.
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass The value <em class="parameter"><code>none</code></em> will clear the default
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass Specifies that all updates are to be TSIG-signed using the
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass <em class="parameter"><code>keyname</code></em> <em class="parameter"><code>keysecret</code></em> pair.
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass The <span><strong class="command">key</strong></span> command
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass overrides any key specified on the command line via
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass <code class="option">-y</code> or <code class="option">-k</code>.
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass <span><strong class="command">gsstsig</strong></span>
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass Use GSS-TSIG to sign the updated. This is equivalent to
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass specifying <code class="option">-g</code> on the commandline.
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass <span><strong class="command">oldgsstsig</strong></span>
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass Use the Windows 2000 version of GSS-TSIG to sign the updated.
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass This is equivalent to specifying <code class="option">-o</code> on the
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass commandline.
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass <span><strong class="command">realm</strong></span>
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass When using GSS-TSIG use <em class="parameter"><code>realm_name</code></em> rather
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass than the default realm in <code class="filename">krb5.conf</code>. If no
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass realm is specified the saved realm is cleared.
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass <span><strong class="command">prereq nxdomain</strong></span>
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass {domain-name}
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass Requires that no resource record of any type exists with name
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass <em class="parameter"><code>domain-name</code></em>.
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass <span><strong class="command">prereq yxdomain</strong></span>
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass {domain-name}
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass Requires that
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass <em class="parameter"><code>domain-name</code></em>
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass exists (has as at least one resource record, of any type).
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass <span><strong class="command">prereq nxrrset</strong></span>
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass {domain-name}
046ea4d1ee0f22d956cd360e1e0c0b275aa4bbd0Dav Glass Requires that no resource record exists of the specified
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass <em class="parameter"><code>domain-name</code></em>.
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass is omitted, IN (internet) is assumed.
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass <span><strong class="command">prereq yxrrset</strong></span>
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass {domain-name}
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass This requires that a resource record of the specified
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass <em class="parameter"><code>domain-name</code></em>
5b139d58acfcae4b1bcab5a895706abafc2a87a0Dav Glass is omitted, IN (internet) is assumed.
> update delete oldhost.example.com A
> update add newhost.example.com 86400 A 172.16.1.1
> prereq nxdomain nickname.example.com