Solved

Split DNS

Posted on 2016-11-17
3
52 Views
Last Modified: 2016-11-21
Hi:
1:- What is a Split DNS and where it is used.

Please suggest some good DNS site where I can get complete knowledge of working environment?

Warm regards
Sanjeev Jha.
0
Comment
Question by:Sanjeev jha
3 Comments
 
LVL 16

Expert Comment

by:Dirk Mare
ID: 41891911
This wiki article explains it pretty good..
https://en.m.wikipedia.org/wiki/Split-horizon_DNS

DirkMare
0
 
LVL 12

Accepted Solution

by:
Kent W earned 500 total points
ID: 41891925
Split DNS means that your internal DNS is different than external.
We use this at my company.

Scenerio - The web servers we use for day to day business are also the same web servers our clients hit externally.
Since our web servers and load blancers are physically on our local lan, thus internal, we resolve their internal IP addresses with our internal DNS servers, which are set up to point to the private IPs of said sites  or the load balancer(s) they are behind.

Each of these web servers also has a NATed Public<>Private IP address so they can be reached externally.
We use a different DNS service (the one named in our NS records via the domain registrar) to answer external DNS queries, which resolves to the public, routable IP that we also have NATed through to the internal private IP for said server(s).

The effect is, if  you are on our local lan, and useing our local name servers, you are given the internal address for those assets that are set up this way, and if you are not using our internal DNS, you go through the top level hint servers and ultimately arrive at the named public NS servers for the domain.

I don't know of a public example to give a particular site that may have this setup, as you can see just due to the nature of how it operates.
The split DNS setup only makes sense if you have in internal private network that is also served up, in some form, publicly. As you can see, you can't really setup this scenario on the public net.

Split-horizon DNS is the configuration of ONE Name Server to handle both the internal and external query "answers", thereby giving the correct internal or external IP to the relative DNS client. In BIND, for example, this is accomplished with ACL resource record , then applied to "view" resource record(s) (external / internal views).
0
 

Author Closing Comment

by:Sanjeev jha
ID: 41896452
Thanks for clearing doubt
0

Featured Post

MIM Survival Guide for Service Desk Managers

Major incidents can send mastered service desk processes into disorder. Systems and tools produce the data needed to resolve these incidents, but your challenge is getting that information to the right people fast. Check out the Survival Guide and begin bringing order to chaos.

Question has a verified solution.

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

Most DNS problems are VERY easily troubleshot and identifiable if you can follow the steps a DNS query takes. I would like to share the step-by-step a DNS query takes from the origin to the destination. _____________________________________________…
I will assume you are running a non-server version of some sort of Windows throughout this article. There are many flavors of Windows since Windows Server 2000 - 2008, XP Home & Pro, Vista Home & Pro, and Windows 7 Starter, Home, Pro, Ultimate, etc.…
Although Jacob Bernoulli (1654-1705) has been credited as the creator of "Binomial Distribution Table", Gottfried Leibniz (1646-1716) did his dissertation on the subject in 1666; Leibniz you may recall is the co-inventor of "Calculus" and beat Isaac…
Nobody understands Phishing better than an anti-spam company. That’s why we are providing Phishing Awareness Training to our customers. According to a report by Verizon, only 3% of targeted users report malicious emails to management. With compan…

807 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