Go Premium for a chance to win a PS4. Enter to Win

x
?
Solved

secondary DNS behavious when cutoff from primary DNS

Posted on 2013-01-04
1
Medium Priority
?
295 Views
Last Modified: 2013-01-04
Hi

One of my clients manages a central HQ, plus remote sites.

The HQ has a Windows 2008 acting as the primary DNS server,
while the Windows 2008 stand alone servers at the remote sites
all act as secondary DNS servers to the primary.  

The forwarding server of these secondary DNS servers is
set to the primary server, and not to the local ISP's DNS
- which to me seems wrong.

The remote site servers also run an in-house web app

When the remote site's Internet link goes down, the local
workstations continue to access the local web app unhindered.

Twenty four hours later, however, the workstations can't
access the web app anymore. The server hasn't been rebooted;
I'm not sure whether the workstation has been switched off
overnight, although I suppose it has.

The two solutions used up till now were connecting to the app
using the local server's IP address, or by inserting the local
server's FQDN and IP pair into the workstation's host file.

Obviously this type of situation doesn't happen too frequently.

What I'd like to know, the next time this happens, is what address
does the web app resolve to on the workstations when it fails ?

Any ideas ?
I'll add the responses asap to the two queries I formulated here
while writing my question.

thanks

yann
0
Comment
Question by:Yann Shukor
1 Comment
 
LVL 15

Accepted Solution

by:
Frabble earned 2000 total points
ID: 38746030
I suspect the SOA record for the zone has the expiry time set to the default of 24 hours. After this time, if a secondary DNS cannot contact a primary name server, it will stop answering queries for this zone because it considers the data too old to be reliable.
You can fix this by changing the SOA Expire time value on the primary DNS for that zone to something else, for example, 3 days - something longer than a remote site link stays down for.
0

Featured Post

Free Tool: Subnet Calculator

The subnet calculator helps you design networks by taking an IP address and network mask and returning information such as network, broadcast address, and host range.

One of a set of tools we're offering as a way of saying thank you for being a part of the community.

Question has a verified solution.

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

If you are running a LAMP infrastructure, this little code snippet is very helpful if you are serving lots of HTML, JavaScript and CSS-related information. The mod_deflate module, which is part of the Apache 2.2 application, provides the DEFLATE…
If you are a web developer, you would be aware of the <iframe> tag in HTML. The <iframe> stands for inline frame and is used to embed another document within the current HTML document. The embedded document could be even another website.
Want to learn how to record your desktop screen without having to use an outside camera. Click on this video and learn how to use the cool google extension called "Screencastify"! Step 1: Open a new google tab Step 2: Go to the left hand upper corn…
When cloud platforms entered the scene, users and companies jumped on board to take advantage of the many benefits, like the ability to work and connect with company information from various locations. What many didn't foresee was the increased risk…
Suggested Courses
Course of the Month10 days, 5 hours left to enroll

926 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