Great Circle Associates Firewalls
(September 1994)
 

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Subject: Re: I hate DNS...
From: Larry Chin <Larry_Chin @ cchtor . ca . cch . com>
Date: Thu, 1 Sep 1994 07:04:02 -0400
To: mjs @ tiaa . org
Cc: firewalls @ greatcircle . com

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>> But mostly only because I don't fully understand it.  What I want to do
>> is set up to do as Brent and others recommend: bastion host lies like
>> hell, but is authoritative for the domain; establishes MX records to
>> forward everything for the domain to the "inside"; provides bogus, but
>> sufficient, information for A and PTR records (so I can still use e.g.,
>> ftp.uu.net).  Does anyone have a template they can mail to me, or is
>> there an example available via ftp somewhere?!?


This is actually not too hard to do ( once you've done it yourself :-) ).

In a nutshell:

Put a full set of DNS db files on the bastion complete with SOA records
and named.boot records that make the bastion look like the primary.

The trick here is to put only the hosts you want the world to know
about in the hosts file on the bastion. You then create a resolv.conf
file that points at the real primary behind the firewall, to allow
resolution of addresses behind the firewall.

In addition, the real primary has a forwarders line in the named boot
file that points at the bastion.
This latter is necessary since the real primary cannot connect directly
to the Internet. Hence if an inquiry is sent to the real primary that
requires a look up on an external host, the inquiry is sent to the
bastion which does the lookup and returns the answer to the real
primary.

One other thing, you probably want to get a separate Class C for your perimter
net, you didn't mention that anywhere, so just in case ......

Examples ? See the attached. I have tried to make them generic and hopefully
I haven't made too many typos in doing so - caveat emptor.


Hope this helps.


Thu Sep  1 07:01:15 EDT 1994
===========================================================================
Larry Chin {larry@cchtor.ca.cch.com}	System/Network Administrator
CCH Canadian Ltd.			(416) 441-4001 ext. 349	
===========================================================================

"I don't care who does the electing as long as I get to do the
nominating"
		-- Boss Tweed
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end


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From: ingemar @ anjou . data . telia . se (Ingemar Lundqvist)
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From: "Daniel O'Callaghan" <danny @ cwis . unimelb . edu . au>
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From: Doug Gwyn (ACISD/MCSB) <gwyn @ ARL . MIL>

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