using unregistered domain names Post: 25659

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Special Forums IP Networking using unregistered domain names Post 25659 by warrend on Friday 2nd of August 2002 07:29:16 AM

08-02-2002

Registered User

DNS works on a tree principle.

When I perform a local DNS look-up, that request is forwarded to my DNS server. If that DNS server doesn't know where that domain is then it forwards the request to its DNS server (or the registrar DNS server of the top level domain [e.g. .com or .org]) Anyhow a request is forwarded up the tree until it hits someone that knows which DNS (nameserver) it resides on then it goes back down the tree to that namesever which provides the IP address, which is then sent back to the original DNS server, which then sends it back to the client.

Basically, if you make your own DNS server and say that IP address "x.x.x.x" is domain "anything.com", anybody getting DNS information from that DNS server will believe that IP address "x.x.x.x" is "anything.com". Now due to the fact that DNS operates in a tree structure your DNS server is going to be at the bottom of that, so no other DNS server should be querying you.

So in answer to your question, it really wouldn't make any difference. If your domain "anything.com" isn't registered at the TLD registrar (at the top of the tree) then my DNS server won't know that your DNS server is the host for that domain.

Hope this make sense.

warrend

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net::dns::mailbox

Net::DNS::Mailbox(3)					User Contributed Perl Documentation				      Net::DNS::Mailbox(3)

NAME

       Net::DNS::Mailbox - DNS mailbox representation

SYNOPSIS

	   use Net::DNS::Mailbox;

	   $mailbox = new Net::DNS::Mailbox('user@example.com');
	   $address = $mailbox->address;

DESCRIPTION

       The Net::DNS::Mailbox module implements a subclass of DNS domain name objects representing the DNS coded form of RFC822 mailbox address.

METHODS

   new
	   $mailbox = new Net::DNS::Mailbox('John.Doe@example.com');
	   $mailbox = new Net::DNS::Mailbox('John Doe <j.doe@example.com>');

       Creates a mailbox object which represents the DNS domain encoded form of the mail address specified by the character string argument.

       The argument string consists of printable characters from the 7-bit ASCII repertoire.

   address
	   $address = $mailbox->address;

       Returns a character string corresponding to the RFC822 form of mailbox address of the domain as described in RFC1035 section 8.

       The string consists of printable characters from the 7-bit ASCII repertoire.

DOMAIN NAME COMPRESSION AND CANONICALISATION

       The Net::DNS::Mailbox1035 and Net::DNS::Mailbox2535 subclass packages implement RFC1035 domain name compression and RFC2535
       canonicalisation.

COPYRIGHT

       Copyright (c)2009,2010 Dick Franks.

       All rights reserved.

       This program is free software; you may redistribute it and/or modify it under the same terms as Perl itself.

SEE ALSO

       perl, Net::DNS, Net::DNS::DomainName, RFC822, RFC1035, RFC5322

perl v5.16.2							    2012-01-27						      Net::DNS::Mailbox(3)