Solved

The "Alternate DNS Server" is actually never put into work ??

Posted on 2014-01-10
4
316 Views
Last Modified: 2014-01-30
I shut down one of DNS servers for a couple of hours for maintenance and this DNS happens to be listed as "Preferred DNS Server" on all computers. After I shut down, my LAN started to be disconnected simply because this "Preferred DNS Server" is temporarily down. BUT don't forget we do have another secondary DNS server properly set up as "Alternate DNS Server". How come this "Alternate DNS Server" was NOT coming to help when the Preferred DNS Server is down??
Did I miss anything so the Alternate DNS Server never comes to play its role? Please help.
0
Comment
Question by:Castlewood
4 Comments
 
LVL 22

Expert Comment

by:Nick Rhode
ID: 39772062
And DHCP is pushing both DNS servers correct?  Are the two servers not syncing properly? Perhaps DNS service is not started on the 2nd server?
0
 

Author Comment

by:Castlewood
ID: 39772159
DHCP should not be a factor since computers with static assigned IP are with the issue too.
I verified and confirmed that both DNS servers are working well individually. The issue here is, the "Alternative DNS Server" is just not playing its role to kick in when the Preferred is down.

But don't you guys have this identical issue at your environment?
0
 
LVL 36

Expert Comment

by:Mahesh
ID: 39772386
What exactly happens when you say LAN computers started disconnection ?
Are the disconnected server also holding Active Directory and FSMO role ?

Internet gone down ?
may be DNS forwarder is set on disconnected DNS server
OR
Applications are stopped working ?
 
Mahesh
0
 
LVL 5

Accepted Solution

by:
piwowarc earned 500 total points
ID: 39801705
Hello

Are you able to query both those servers with success?  If you don't have / cant use DIG, simple nslokup can force query. nslookup RECORD SERVER (ex nslookup yahoo.com 8.8.8.8).

Windows resolver (dns client) is an aggressive fella and tries to query alternate dns after 1s of not getting answer from primary one and in couple of seconds it will bomb all of them (if you have more than 2 configured) so in real life you may have some queries going to alternate server anyway without knowing it.

Focus on ensuring you can reach backup DNS and it operates properly. And if you suffer WAN outage to check DNS is alive, ask something hosted locally obviously (like internal records) so you know server actually responds, it may just have problems reaching internet for answer.

Regards
0

Featured Post

Netscaler Common Configuration How To guides

If you use NetScaler you will want to see these guides. The NetScaler How To Guides show administrators how to get NetScaler up and configured by providing instructions for common scenarios and some not so common ones.

Question has a verified solution.

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

I wrote this article to explain some important DNS concepts that should be known to avoid some typical configuration errors I often see in forums. I assume that what is described here is the typical behavior of Microsoft DNS client. I don't know …
I've written instructions for one router type, but this principle may be useful for others of the same brand and even other brands of router. Problem: I had an issue especially with mobile devices that refused to use DNS information supplied via…
This tutorial will show how to configure a single USB drive with a separate folder for each day of the week. This will allow each of the backups to be kept separate preventing the previous day’s backup from being overwritten. The USB drive must be s…
With the advent of Windows 10, Microsoft is pushing a Get Windows 10 icon into the notification area (system tray) of qualifying computers. There are many reasons for wanting to remove this icon. This two-part Experts Exchange video Micro Tutorial s…

786 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