dns

dns(n)								 Tnm Tcl Extension							    dns(n)

__________________________________________________________________________________________________________________________________________________

NAME

       dns - Query the Domain Name System of the Internet.
_________________________________________________________________

DESCRIPTION

       The  dns  command  allows  to query the Internet Domain Name System (DNS) (RFC 1034, RFC 1035, RFC 974, RFC 1912) for host information. The
       main purpose of this command is to convert host names into IP addresses and vice versa. The dns command also allows to retrieve host infor-
       mation records as well as mail exchanger records.

DNS COMMAND

       dns [options]
	      Invoking	the  dns  command with options but without any command arguments allows to retrieve and change the default values. See the
	      description of supported options below. Default values are bound to a Tcl interpreter which allows to have multiple Tcl  interpreter
	      with different defaults.

       dns [options] address host
	      The  dns	address  command  sends  a query to retrieve the address record for the specified host. The command returns the list of IP
	      addresses for the given host name.

       dns [options] name address
	      The dns name command sends a query to retrieve the domain name pointer record. A pointer record maps an IP address to a fully quali-
	      fied domain name (FQDN). The command returns the fully qualified domain name for the given IP address.

       dns [options] hinfo name
	      The dns hinfo command sends a query to retrieve the host information record. The command returns a list containing two elements. The
	      first element describes the hardware type and the second element the operating system.

       dns [options] mx name
	      The dns mx command sends a query to retrieve the mail exchanger record. The command returns a list of mail exchanger records if name
	      is  a domain name for which one or more MX records exist. Each element of this list contains a full qualified domain name (FQDN) and
	      its priority.

       dns [options] soa name
	      The dns soa command sends a query to retrieve the start of authority record for a DNS domain. The command returns the  name  of  the
	      authoritative DNS server of the DNS domain name.

DNS OPTIONS

       -server server
	      The  -server  option  defines  the DNS server which will be used to process the request. The default value is the default DNS server
	      configured on the local system.

       -timeout time
	      The -timeout option defines the time the dns command will wait for a response. The time is defined in seconds with a  default  of  2
	      seconds.

       -retries number
	      The  -retries option defines how many times a request is retransmitted during the timeout interval. The default number of retries is
	      2.  Please note, that many resolver double the last timeout after every retry.

SEE ALSO

       scotty(1), Tnm(n), Tcl(n)

AUTHORS

       Erik Schoenfelder <schoenfr@gaertner.de>
       Juergen Schoenwaelder <schoenw@cs.utwente.nl>

Tnm																	    dns(n)