Solved

DNS question when used as a caching server and configured to use root hints

Posted on 2014-07-24
4
424 Views
Last Modified: 2014-07-25
Hi all,

have a design type query.
We are deploying a two 2008 R2 Core DNS caching server on a DMZ. The DNS server will be used for recursive quires using the root hints (no ISP DNS servers available). We will then configure our Active Directory integrated DNS servers to use the DMZ servers as forwarder from within DNS console. Here are the questions.
1. Does anyone see any inherent problems with the design?
2. Is there anything I need to be aware of in using the cache service as I've never set an OS to facilitate the service before - normally used ISA\ TMG.
3. Is it a bad idea to do this a different way, what about opening up the AD Integrated DNS servers to use the root hints themselves - any concerns?
Thank you for looking.
0
Comment
Question by:Jason Thomas
  • 2
  • 2
4 Comments
 
LVL 35

Expert Comment

by:Mahesh
Comment Utility
The best option could be have ISP DNS server to which you will forward your name resolution queries from corporate network

The workaround you have should work

Please keep caching DNS servers in workgroup and do not allow any inbound traffic on them from internet
Just open dns port (53) from caching only server to internet to get name resolution
From internal AD servers you need to open 53 ports towards caching only server

Its not very good idea to enable direct internet name resolution on AD server if other options are abavailable.
0
 
LVL 1

Author Comment

by:Jason Thomas
Comment Utility
Hi Mahesh, I appreciate your time in responding to ma thank you. I understand what you have said but do have one follow up question.
You say about not allowing any inbound traffic from the internet to the caching servers, I assume I open  open UDP and TCP port 53 from the caching servers through firewall and this will do what you recomend?
From Internal DNS servers, open UDP and TCP ports from each DNS server to the 2 caching servers?

Thank you.
0
 
LVL 35

Accepted Solution

by:
Mahesh earned 500 total points
Comment Utility
Yes, you are right
Just trying to keep it secure as far as possible

If you want, you can open tcp 80 and 443 from caching servers to internet so in case you face any issues, you can test connectivity from caching only servers to internet
0
 
LVL 1

Author Closing Comment

by:Jason Thomas
Comment Utility
Great tip thank you
0

Featured Post

How your wiki can always stay up-to-date

Quip doubles as a “living” wiki and a project management tool that evolves with your organization. As you finish projects in Quip, the work remains, easily accessible to all team members, new and old.
- Increase transparency
- Onboard new hires faster
- Access from mobile/offline

Join & Write a Comment

Occasionally you run into the website or two that will not resolve properly using your own DNS servers.  Some people simply set up global forwarders for their DNS server.  I don’t recommend doing this because it can cause problems resolving addresse…
You might have come across a situation when you have Exchange 2013 server in two different sites (Production and DR). After adding the Database copy in ECP console it displays Database copy status unknown for the DR exchange server. Issue is strange…
This tutorial will give a short introduction and overview of Backup Exec 2012 and how to navigate and perform basic functions. Click on the Backup Exec button in the upper left corner. From here, are global settings for the application such as conne…
This tutorial will walk an individual through the steps necessary to join and promote the first Windows Server 2012 domain controller into an Active Directory environment running on Windows Server 2008. Determine the location of the FSMO roles by lo…

744 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

18 Experts available now in Live!

Get 1:1 Help Now