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diff --git a/bin/dig/nslookup.rst b/bin/dig/nslookup.rst new file mode 100644 index 0000000..2d1e123 --- /dev/null +++ b/bin/dig/nslookup.rst @@ -0,0 +1,206 @@ +.. Copyright (C) Internet Systems Consortium, Inc. ("ISC") +.. +.. SPDX-License-Identifier: MPL-2.0 +.. +.. This Source Code Form is subject to the terms of the Mozilla Public +.. License, v. 2.0. If a copy of the MPL was not distributed with this +.. file, you can obtain one at https://mozilla.org/MPL/2.0/. +.. +.. See the COPYRIGHT file distributed with this work for additional +.. information regarding copyright ownership. + +.. highlight: console + +.. _man_nslookup: + +nslookup - query Internet name servers interactively +---------------------------------------------------- + +Synopsis +~~~~~~~~ + +:program:`nslookup` [-option] [name | -] [server] + +Description +~~~~~~~~~~~ + +``nslookup`` is a program to query Internet domain name servers. +``nslookup`` has two modes: interactive and non-interactive. Interactive +mode allows the user to query name servers for information about various +hosts and domains or to print a list of hosts in a domain. +Non-interactive mode prints just the name and requested +information for a host or domain. + +Arguments +~~~~~~~~~ + +Interactive mode is entered in the following cases: + +a. when no arguments are given (the default name server is used); + +b. when the first argument is a hyphen (-) and the second argument is + the host name or Internet address of a name server. + +Non-interactive mode is used when the name or Internet address of the +host to be looked up is given as the first argument. The optional second +argument specifies the host name or address of a name server. + +Options can also be specified on the command line if they precede the +arguments and are prefixed with a hyphen. For example, to change the +default query type to host information, with an initial timeout of 10 +seconds, type: + +:: + + nslookup -query=hinfo -timeout=10 + +The ``-version`` option causes ``nslookup`` to print the version number +and immediately exit. + +Interactive Commands +~~~~~~~~~~~~~~~~~~~~ + +``host [server]`` + This command looks up information for ``host`` using the current default server or + using ``server``, if specified. If ``host`` is an Internet address and the + query type is A or PTR, the name of the host is returned. If ``host`` is + a name and does not have a trailing period (``.``), the search list is used + to qualify the name. + + To look up a host not in the current domain, append a period to the + name. + +``server domain`` | ``lserver domain`` + These commands change the default server to ``domain``; ``lserver`` uses the initial + server to look up information about ``domain``, while ``server`` uses the + current default server. If an authoritative answer cannot be found, + the names of servers that might have the answer are returned. + +``root`` + This command is not implemented. + +``finger`` + This command is not implemented. + +``ls`` + This command is not implemented. + +``view`` + This command is not implemented. + +``help`` + This command is not implemented. + +``?`` + This command is not implemented. + +``exit`` + This command exits the program. + +``set keyword[=value]`` + This command is used to change state information that affects the + lookups. Valid keywords are: + + ``all`` + This keyword prints the current values of the frequently used options to + ``set``. Information about the current default server and host is + also printed. + + ``class=value`` + This keyword changes the query class to one of: + + ``IN`` + the Internet class + + ``CH`` + the Chaos class + + ``HS`` + the Hesiod class + + ``ANY`` + wildcard + + The class specifies the protocol group of the information. The default + is ``IN``; the abbreviation for this keyword is ``cl``. + + ``nodebug`` + This keyword turns on or off the display of the full response packet, and any + intermediate response packets, when searching. The default for this keyword is + ``nodebug``; the abbreviation for this keyword is ``[no]deb``. + + ``nod2`` + This keyword turns debugging mode on or off. This displays more about what + nslookup is doing. The default is ``nod2``. + + ``domain=name`` + This keyword sets the search list to ``name``. + + ``nosearch`` + If the lookup request contains at least one period, but does not end + with a trailing period, this keyword appends the domain names in the domain + search list to the request until an answer is received. The default is ``search``. + + ``port=value`` + This keyword changes the default TCP/UDP name server port to ``value`` from + its default, port 53. The abbreviation for this keyword is ``po``. + + ``querytype=value`` | ``type=value`` + This keyword changes the type of the information query to ``value``. The + defaults are A and then AAAA; the abbreviations for these keywords are + ``q`` and ``ty``. + + Please note that it is only possible to specify one query type. Only the default + behavior looks up both when an alternative is not specified. + + ``norecurse`` + This keyword tells the name server to query other servers if it does not have + the information. The default is ``recurse``; the abbreviation for this + keyword is ``[no]rec``. + + ``ndots=number`` + This keyword sets the number of dots (label separators) in a domain that + disables searching. Absolute names always stop searching. + + ``retry=number`` + This keyword sets the number of retries to ``number``. + + ``timeout=number`` + This keyword changes the initial timeout interval to wait for a reply to + ``number``, in seconds. + + ``novc`` + This keyword indicates that a virtual circuit should always be used when sending requests to the server. + ``novc`` is the default. + + ``nofail`` + This keyword tries the next nameserver if a nameserver responds with SERVFAIL or + a referral (nofail), or terminates the query (fail) on such a response. The + default is ``nofail``. + +Return Values +~~~~~~~~~~~~~ + +``nslookup`` returns with an exit status of 1 if any query failed, and 0 +otherwise. + +IDN Support +~~~~~~~~~~~ + +If ``nslookup`` has been built with IDN (internationalized domain name) +support, it can accept and display non-ASCII domain names. ``nslookup`` +appropriately converts character encoding of a domain name before sending +a request to a DNS server or displaying a reply from the server. +To turn off IDN support, define the ``IDN_DISABLE`` +environment variable. IDN support is disabled if the variable is set +when ``nslookup`` runs, or when the standard output is not a tty. + +Files +~~~~~ + +``/etc/resolv.conf`` + +See Also +~~~~~~~~ + +:manpage:`dig(1)`, :manpage:`host(1)`, :manpage:`named(8)`. |