01-18-2011
Yes, forwarding, for the "forwarding DNS" when resolving simple client recursion-desired calls, is making its own, supporting, recusion-desired calls of the "forwarded-to DNS", so the "forwarding DNS" is not burdened with, or motivated toward, contacting outside DNS servers. This is very common behind firewalls.
When the call to the "forwarding DNS" is NOT recursion-desired, meaning it is from another DNS server or other high level functioning client, I am not sure, offhand, if it may direct the caller to the "forwarded-to DNS", but I doubt it, as the routing and firewalls might not allow that, and that is not the spirit of "Forwarding".
Usually, you want DNS traffic with the Internet to happen either on the firewall host DNS (nothing through), or through the firewall between specific internal DNS servers (last internal tier) to specific external DNS servers only (local in DMZ or at the ISP). The firewall is a router to the Internet, so you may have two for redundancy, both for traffic and DNS.
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LEARN ABOUT CENTOS
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 containing the RFC822 mailbox address corresponding to the encoded domain name representation described in
RFC1035 section 8.
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)2009,2012 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 v5.16.3 2012-12-28 Net::DNS::Mailbox(3)