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Network Security Firewalls
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Re: DNS Best Practices Question

from [Fabrice Aubry] Network Security [Permanent Link]
Subject: Re: DNS Best Practices Question
Date: 23 Nov 2004 17:59:27 -0000 
In-Reply-To: <200411192125.iAJLAj18018979@ns1.graybar.com>

Hi,

One possible thing to do just to prevent DNS service outage is to have at least 
one caching only DNS Server.

This could be a simple solution to prevent name resolution from failing in the 
case ISP DNS Servers go down.

Hope this help.

Fabrice Aubry
SysAdmin / Wanadoo Hosting



Good afternoon list,=20

Currently we have 3 firewalls that are sending outbound traffic to the =
Internet.=20

When a DNS request comes in we have it forward from internal interface to =
external interface. The external DNS servers then sends the request to one =
of three main DNS servers at our ISP

Well, yesterday all three of the DNS servers at our ISP had major issues =
and it caused DNS related issues within the company. As a result several =
discussions were held as to the industries Best Practice on this.

What is the current thoughts on "Best Practice" for this. Should we =
forward the DNS request to these other servers, or should we have the =
firewalls do the work themselves? What is the industry doing?

Your thoughts and comments would be appreciated.

Richard St. John
Graybar Electric Company
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