Solved

Fixing conflict between internal and external domain with same name via internal DNS entries

Posted on 2014-10-13
6
922 Views
Last Modified: 2014-10-13
On newly deployed Windows Server 2012 R2, followed the advice given on another question on naming the internal domain the same as the external domain for the sake of username consistency for using with Office365.

I wondered at how this would affect DNS, but when you are revamping your deployment plan in mid-deployment...

So of course this has led to the external website not resolving properly internally as well as issues with any of the external domains DNS records being recognized internally.

I beleive that this can be fixed by the appropriate entries in the DC's DNS table, however, that is beyond my (admittedly basic) DNS knowledge.

I believe that I probably need to recreate all external DNS entriesas static entries only.

I am unsure of many things though:

#1. Should I be adding these entries to the existing internal domain lookup zone or creating a new zone?

#2. If a new zone, what kind of new zone should it be? (Primary, Secondary, Sub)

#3. If a new zone, do I need to change any of its default properties?
0
Comment
Question by:MJCS
  • 4
  • 2
6 Comments
 
LVL 16

Accepted Solution

by:
Joshua Grantom earned 500 total points
ID: 40377900
It will be in the existing zone if your internal domain is the exact same name as your external.

Once you create the a, cname, and mx records to mirror external dns, everything should be accessible after that.
0
 
LVL 16

Expert Comment

by:Joshua Grantom
ID: 40377925
do you have any external sub-domains?
0
 
LVL 2

Author Comment

by:MJCS
ID: 40377926
Should propagation be immediate?
0
PRTG Network Monitor: Intuitive Network Monitoring

Network Monitoring is essential to ensure that computer systems and network devices are running. Use PRTG to monitor LANs, servers, websites, applications and devices, bandwidth, virtual environments, remote systems, IoT, and many more. PRTG is easy to set up & use.

 
LVL 16

Assisted Solution

by:Joshua Grantom
Joshua Grantom earned 500 total points
ID: 40377938
clients may need to flush dns cache

Run this from a command line.
ipconfig /flushdns
0
 
LVL 2

Author Comment

by:MJCS
ID: 40377987
Do I need to worry about spf/txt records?
0
 
LVL 16

Assisted Solution

by:Joshua Grantom
Joshua Grantom earned 500 total points
ID: 40377999
I wouldn't worry about spf records because you are using Office 365. Only the external spf will be read by other mail servers.
0

Featured Post

DevOps Toolchain Recommendations

Read this Gartner Research Note and discover how your IT organization can automate and optimize DevOps processes using a toolchain architecture.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Understanding the various editions available is vital when you decide to purchase Windows Server 2012. You need to have a basic understanding of the features and limitations in each edition in order to make a well-informed decision that best suits y…
The recent Microsoft changes on update philosophy for Windows pre-10 and their impact on existing WSUS implementations.
In this Micro Tutorial viewers will learn how to restore their server from Bare Metal Backup image created with Windows Server Backup feature. As an example Windows 2012R2 is used.
This tutorial will walk an individual through the process of transferring the five major, necessary Active Directory Roles, commonly referred to as the FSMO roles from a Windows Server 2008 domain controller to a Windows Server 2012 domain controlle…

815 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

8 Experts available now in Live!

Get 1:1 Help Now