Great Circle Associates Firewalls
(February 1996)
 

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Subject: can I run DNS on a packet screening gateway.
From: Alex Pakter <Alex . Pakter @ omnitel . it>
Date: Thu, 15 Feb 1996 19:27:35 +0100 (MET)
To: firewalls @ GreatCircle . COM

Hi All-

We are installing a the DFWS (Digital FireWall Service -- used to be the
SEAL firewall) here.  This is a two host system as described below:


        FW Host #1     
        Proxy host           Router to Internet
           |                       |
           |                       |
      --------------------------------------
                  |         Insecure net
                  |
               FW Host #2
               Packet
	       screening
               gateway
                  |
                  |               
      --------------------------------------
                            Internal Net
   


Host #1 runs all the proxies, as well as the DNS for the external world.
We have another DNS internally.  Our Service consultant from Digital
recommends running a caching Name Server on Host #2 so that DNS
queries from Host #1 get cached, and save traffic -- otherwise all
queries from Host #1 would have to be passed to our internal name server.

However, I remember reading that it's not a good idea to run DNS on
the gateway host. I'm inclined to say no.  And anyway, we have a DNS server
on the same subnet as Host #2 internally.

What do you all think?  Should I run DNS on Host #2?

Alex		|	Alex Pakter - UNIX systems analyst
----		|	Omnitel Pronto Italia - Milano, Italy
		|	Internet Mail:  Alex .
 Pakter @
 omnitel .
 it
Have a day.	|	WWW Home Page:  http://idiom.com/~alex (in progress)

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