dns(n) Tnm Tcl Extension dns(n)_________________________________________________________________NAMEdns - 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 information
records as well as mail exchanger records.
DNS COMMANDdns [options]
Invoking the dns command with options but without
any command arguments allows to retrieve and change
the default values. See the description of sup-
ported 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 com-
mand 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 qualified 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 ele-
ment of this list contains a full qualified domain
name (FQDN) and its priority.
Tnm 1
dns(n) Tnm Tcl Extension dns(n)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 com-
mand 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 inter-
val. The default number of retries is 2. Please
note, that many resolver double the last timeout
after every retry.
SEE ALSOscotty(1), Tnm(n), Tcl(n)AUTHORS
Erik Schoenfelder <schoenfr@gaertner.de>
Juergen Schoenwaelder <schoenw@cs.utwente.nl>
Tnm 2
