Great Circle Associates Firewalls
(August 1997)
 

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Subject: DNS third party setup
From: Phil Chadwick <syspmc @ dtir . qld . gov . au>
Date: Mon, 1 Sep 1997 10:28:40 +1000 (EST)
To: Firewalls @ GreatCircle . COM

I would appreciate some advice on a tricky name server 
configuration problem.  We have a fairly standard setup with:

  - an internal name server which knows about everything
    inside our domain with "forwarders <bastion-host>" and
    "slave" directives to direct external lookups; and

  - a bastion host which runs a domain name server:

      + the server knows about only a few of our publicly
	accessible internal hosts, and
      
      + bastion host clients query the internal server.

The problem is a third party which can be reached either on
the Internet or via a private network connection.  The private
link is used for sensitive transactions on hosts which are not
accessible from the Internet.  I need to be able to resolve
the names of these hosts.

Using host files on our clients is not an option.  There are
too many clients - it really needs to be done by a name server.

One suggestion is to load the internal name server cache with
the required information.  However I have a vague recollection
of an assertion that cache-entry TTLs may be ignored.

Would anyone like to comment on the use of the cache for this
purpose, or offer any other solution?


Phil
--                                             Phil Chadwick
Email:  syspmc @
 dtir .
 qld .
 gov .
 au       ,-_|\     Supervisor, UNIX Support
Phone:  +61 7 3247 9239             /     *    Department of Training
Fax:    +61 7 3247 9111             \_,-._/    and Industrial Relations
                                         v

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