Avatar of FBRemote
FBRemote
 asked on

Internal MS DNS resolution problems.. going crazy!

Hi.  Recently had a re-ip of a small office.  Server A was changed along with all others.  Static DNS entries corrected. WINS removed from the environment (all microsoft).  Server A is a SQL 2008 R2 server, running a db for an internal app.

We are getting a situation where the internal app launches fine, but at some point, they lose connectivity.  If they ping Server A, they get Server B's IP address.  an ipconfig /flushdns resolves the issue.

Things tried:
1) shut down WINS/wins services.
2) verified that all DNS servers have the correct static IP
3) verified the client is pointing to the proper dns servers
4) looked in the dns for cname entries
5) used nslookup to show proper resolution when queried.
6) checked local hosts/lmhosts files
7) checked server adapter settings for secondary IP mappings
8) ran arp - a to verify correct macs being returned

Is there any way of finding out, by hostname, what resolution source is responsible?  What additional steps can I take to try and narrow this down?

Thanks in advance!
TCP/IPWindows NetworkingNetwork Architecture

Avatar of undefined
Last Comment
Seth Simmons

8/22/2022 - Mon
Kaffiend

Looks like you have already covered most of the bases:
DNS servers - check
Hosts files on node running the internal app - check
secondary ip addresses - check
etc etc.

Is this problem only manifest on the node that is running the internal app?  (Or are all nodes similarly affected?)  If so, redouble your efforts there.  I suspect maybe the internal app has things hard-coded somewhere.
FBRemote

ASKER
We have now excluded the app from being the culprit.  Workstations not running the app are also affected.  We are wondering now if it may be a switch issue.
ASKER CERTIFIED SOLUTION
Kaffiend

THIS SOLUTION ONLY AVAILABLE TO MEMBERS.
View this solution by signing up for a free trial.
Members can start a 7-Day free trial and enjoy unlimited access to the platform.
See Pricing Options
Start Free Trial
GET A PERSONALIZED SOLUTION
Ask your own question & get feedback from real experts
Find out why thousands trust the EE community with their toughest problems.
Seth Simmons

No comment has been added to this question in more than 21 days, so it is now classified as abandoned.

I have recommended this question be closed as follows:

Accept: Kaffiend (https:#a41740963)

If you feel this question should be closed differently, post an objection and the moderators will review all objections and close it as they feel fit. If no one objects, this question will be closed automatically the way described above.

seth2740
Experts-Exchange Cleanup Volunteer
This is the best money I have ever spent. I cannot not tell you how many times these folks have saved my bacon. I learn so much from the contributors.
rwheeler23