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Full Discussion: Multihomed DNS Clients?
Special Forums IP Networking Multihomed DNS Clients? Post 302113709 by deckard on Monday 9th of April 2007 11:54:19 AM
Old 04-09-2007
Multihomed DNS Clients?

I'm not sure it that's the right term for what I'm asking about, but it's the best I could come up with. Here is my situation...

I'm setting up a network using OpenVPN. The clients I'm setting up will need to be able to access their own DNS servers (to resolve internal names at their location) as well as my DNS server for my internal hosts. In the past I was lead to believe that this is possible by doing something like:

nameserver (ip of site1-domain.com's DNS server)
nameserver (ip of my-domain.com's DNS server)
nameserver (ip of the Client ISP's DNS server)

search site1-domain.com
search my-domain.com
search client-isp.com

And so on. With the idea that if a searched host only existed in site1-domain.com, then the name resolution would stop there and the client would then know the correct IP. If the searched host only existed in my-domain.com, then the search would fail when the site1-domain.com DNS was queried and the search would continue onto my DNS server where it would be resolved properly. If neither of the search domains + DNS servers gave the appropriate answer, then the last place to go would be the ISP's DNS server. (In case the client's primary DNS server was failing and they wanted to redirect all queries to the outside world so that at least internet access would work)

However, when I set up this configuration, I ran into multiple issues which lead me to abandon to the configuration. So... was I doing something wrong, or is this simply not possible to do cleanly?
 

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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)
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