Solved

Unknown Strange DNS entries related to "(same as parent folder)" domain name

Posted on 2010-09-24
7
1,040 Views
Last Modified: 2012-05-10
Hi,
When I do a nslookup on my domain name Peknor.com it gives me 5 ip's  3 of them are my domain controllers and the other 2 are unknown address 172.23.22.0 10.95.2.0.
I don't know why would they end by 0's and I also when I look in the DNS list the host name is  (same as parent folder)??

tx!


0
Comment
Question by:SigSupport
  • 2
  • 2
  • 2
  • +1
7 Comments
 
LVL 2

Assisted Solution

by:kernelcop
kernelcop earned 100 total points
ID: 33753654
Typically, IP addresses ending in Zeroes are 'Network IDs". These are reserved and not used.
0
 
LVL 70

Expert Comment

by:Chris Dent
ID: 33753683

Delete them and see if they come back :)

If they do, one of your DCs is likely to be registering them, which would lead onto checking your DCs to see if they have any adapters configured with those addresses.

Chris
0
 

Author Comment

by:SigSupport
ID: 33754609
Hi Chris-Dent,
I'm not too hot about the technique of deleting something just to see the result especially on a production DC :)
One of them is 10.95.2.0 which is our ip phone Vlan which I don't see why it would be listed there and not any other vlans. The other one are a subnet of one of our entities which we have a permanent vpn tunnel with them but here again why would our other permanent vpn tunnels not be listed there if this one is.
0
Best Practices: Disaster Recovery Testing

Besides backup, any IT division should have a disaster recovery plan. You will find a few tips below relating to the development of such a plan and to what issues one should pay special attention in the course of backup planning.

 
LVL 70

Accepted Solution

by:
Chris Dent earned 300 total points
ID: 33754691

Those entries are used for DFS and Group Policy application. The only records listed should be the IP addresses of your DCs.

Network addresses for VLANs have no reason to be there and should be removed.

Chris
0
 
LVL 26

Assisted Solution

by:DrDave242
DrDave242 earned 100 total points
ID: 33755355
I concur with Chris; those extraneous records should be deleted.  "(Same as parent folder)" host records refer to the domain itself rather than a specific host name within the domain.  In an AD domain, only your domain controllers' IP addresses should be listed in those records, or you may experience problems with authentication, replication, etc.
0
 
LVL 2

Assisted Solution

by:kernelcop
kernelcop earned 100 total points
ID: 33755556
I agree with deletion of bogus records. Appropriate records will re-propagate over a short time as requests are serviced by DNS for clients/devices. No harm can be done.
0
 

Author Closing Comment

by:SigSupport
ID: 33783346
They didn't recreate them self and all is working good so far.
tx!
0

Featured Post

How Do You Stack Up Against Your Peers?

With today’s modern enterprise so dependent on digital infrastructures, the impact of major incidents has increased dramatically. Grab the report now to gain insight into how your organization ranks against your peers and learn best-in-class strategies to resolve incidents.

Question has a verified solution.

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

Learn about cloud computing and its benefits for small business owners.
This article outlines the process to identify and resolve account lockout in an Active Directory environment.
This tutorial will walk an individual through the process of configuring their Windows Server 2012 domain controller to synchronize its time with a trusted, external resource. Use Google, Bing, or other preferred search engine to locate trusted NTP …
Microsoft Active Directory, the widely used IT infrastructure, is known for its high risk of credential theft. The best way to test your Active Directory’s vulnerabilities to pass-the-ticket, pass-the-hash, privilege escalation, and malware attacks …

765 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