Also check your reverse lookup zones are configured correctly as this is what nslookup will use.
Main Topics
Browse All Topics
Loading Advertisement...
Question
DNS records have suffix added automatically
Hi,
Having a slight hassle with our DNS server (DNS running on windows server 2003 in active directory integrated mode). When i do nslookup on it for a host 'A' on my network with just the host name it gives me the right IP for A.domain.com; but when i do nslookup on it for the same host while typing the domain name along with it (A.domain.com), it adds an additional domain.com at the end. Then it tries to resolve A.domain.com.domain.com and can't find it and gives me some IP address from my service provider! I dont know if this is a normal thing, but it's hampering with some network access where we have defined the entire fqdn (A.domain.com)
My requirement would be that whether A.domain.com or just 'A' is typed in the nslookup, it should resolve to the IP of 'A'.
Any clues? Thanks.
This Question has been solved and asker verified All Experts Exchange premium technology solutions are available to subscription members.
Subscribe now for full access to Experts Exchange and get
Instant Access to this Solution
- Plus...
- 30 Day FREE access, no risk, no obligation
- Collaborate with the world's top tech experts
- Unlimited access to our exclusive solution database
- Never be left without tech help again
Trusted by hundreds of thousands everyday for fast, accurate and reliable tech support.
- "The time we save is the biggest benefit of Experts Exchange to Warner Bros. What could take multiple guys 2 hours or more each to find is accessed in around 15 minutes on Experts Exchange." Mike Kapnisakis, Warner Bros.
- "Our team likes having a resource that is more secure than just using Google and most experts using this service really know their stuff. It's nice to look here first versus using Google." Dayna Sellner, Lockheed Martin
- "Anytime that I've been stumped with a problem, 9 out of 10 times Experts Exchange has either the accepted solution or an open discussion of the potential solution to the problem." Kenny Red, eBay Inc.
See what Experts Exchange can do for you.
Got a question?
We've got the answer.
Experts Exchange has been collecting answers to technology questions since 1996…3 million and counting! If you have a question, chances are we already have your answer.
Need individual assistance?
Our experts are ready to help.
If you can't find the exact answer you're looking for, ask our exclusive community of 50,000 experts. You’ll get a personalized answer from a trusted professional.
Want to learn from the best?
Read articles from industry experts.
Thousands of free tech tips, tricks, how-to’s and tutorials are available in our peer reviewed articles section. See for yourself how smart our experts are, no login required.
Working on a long term project?
Store your work and research.
Save solutions to your questions, answers you’ve discovered through searching plus helpful articles in your personal knowledgebase for easy future access.
Access the answers to your technology questions today.
30-day free trial. Register in 60 seconds.
What Makes Experts Exchange Unique?
Members of the expert community talk about why the experience at Experts Exchange is different than what you will find anywhere else.
Trusted by the world's most respected brands.
Faithfully serving IT professionals since 1996.
Try it out and discover for yourself.
30-day free trial. Register in 60 seconds.
Free Tech Articles
-
WARNING: 5 Reasons why you should NEVER fix a computer for free.
It is in our nature to love the puzzle. We are obsessed. The lot of us. We love puzzles. We love the challenge. We thrive on finding the answer. We hate disarray. It bothers us deep in our soul. W...
-
SCCM OSD Basic troubleshooting
SCCM 2007 OSD is a fantastic way to deploy operating systems, however, like most things SCCM issues can sometimes be difficult to resolve due to the sheer volume of logs to sift through and the dispe...
-
Migrate Small Business Server 2003 to Exchange 2010 and Windows 2008 R2
This guide is intended to provide step by step instructions on how to migrate from Small Business Server 2003 to Windows 2008 R2 with Exchange 2010. For this migration to work you will need the fo...
-
Create a Win7 Gadget
This article shows you how to create a simple "Gadget" -- a sort of mini-application supported by Windows 7 and Vista. Gadgets can be dropped anywhere on the desktop to provide instant information, ...
-
Outlook continually prompting for username and password
There have been a lot of questions recently regarding Outlook prompting for a username and password whilst using Exchange 2007. There are a few reasons why this would happen and I will try to cover t...
-
Backup Exchange 2010 Information Store using Windows Backup
There seems to be quite a lot of confusion around the ability to backup Exchange 2010 using the built in Windows Backup feature. This stems from the omission of this feature prior to Exchange 2007 s...
Cloud Class Webinars
- Avoiding Bugs in Microsoft Access
Alison Balter takes and in-depth look at avoiding bugs in Access. In this webinar you will learn about using the immediate window to debug your applications, invoking the debugger, using breakpoints to troubleshoot, stepping through code, setting the next statement to execute, ...
- Top 10 Best New Features in Visio 2010
Scott Helmers gives live demonstrations of the top 10 new features in Visio 2010. This webinar will teach you how to create compelling diagrams by adding shapes to the page with a single click, linking the shapes in a diagram to data in Excel (or SQL Server, or SharePoint), ...
- IT Consultant Business Secrets Revealed
Michael Munger, Experts Exchange tech pro and IT consultant, pulls back the curtain on his very successful businesses and answers question on every IT consultant and business owner should know about. He shares secrets on what he did to solve the 5 most common problems in IT, ...
- Disaster Recovery and Business Continuity
Quest CTO, Mike Billon, gives an overview of the steps involved in building a dunamic disaster recovery plan. Through case studies and an examination of software/hardware tooles for monitoring and testing, you'll gain a better understandin of where you are, where you want ...
- Organize Your Visio Diagrams with Containers and Lists
Scott Helmers uses cross functional flowcharts, wireframe diagrams, data graphic legends and seating charts to teach you: how to ustilize all three new structured diagram components in Visio 2010, the best practices for organizeing shapes in previous version of Visio, how to organize ...
- How to Us Objects, Properties, Events and Methods in Microsoft Access
Alison Dalter gives an in-depbth look at objects, properties, events and methods in Microsoft Access. In this webinar you will learn about using the object browser, referring to objects, working with properties and methods, working with object variables, understanding the ...
Join the Community
Give a Little. Get a Lot.
Join the community of experts here and help other tech pros by answering question in your area of expertise. You can earn FREE access to all Experts Exchange's premium features and resources.
Answers
demazter : I checked the DNS suffix on the clients, it is the same as my domain name. also i have checked the reverse lookup zones. There is one configured for every subnet including my server farm subnet.
henjoh09 : i checked my 'domain.com' zone and could not find any record '*'. When i do a filter for that record, i get many '(Same as parent folder)' records which are of 'Name Server' type and point to my domain controllers and then two DNS servers of our ISP. I assume it's getting this from the Name servers tab in the properties on the zone. Also there are two more '(Same as parent folder)' records in the filter result and those are 'Start of Authority' and 'WINS lookup' type.
I noted down and deleted the ISP records from the name servers tab on the zone properties and made sure it's replicated to all other DNS servers. Still nothing positive.
Again when i do a nslookup to the server with A.domain.com, it adds a domain.com at the end automatically and returns a non-authorative answer for A.domain.com.domain.com with some IP from my service provider.
Part of this behavior is normal - nslookup will always append your DNS suffix to its initial query, regardless of whether your query contains just a hostname or an FQDN. This results in ugly-looking queries like "www.google.com.mydomain.l
Thanks Demazter, i did flushdns on the client and also cleared cache on the DNS server, but again nothing positive.
Thanks DrDave242, here the results of the steps you mentioned. I did nslooukp, 'set d2', then did a query for the host A only and then did a query for the host as A.domain.com and here's the output :
C:\Documents and Settings\username>nslookup
D
Addres
> set d2
> A
Server: DNSServer.domain.com
Addres
------------
SendRequest(),
HEADER:
opcode = QUERY, id = 2, rcode = NOERROR
header flags: query, want recursion
questions = 1, answers = 0, authority records = 0, additional = 0
QUESTIONS:
A.domain.com, type = A, class = IN
------------
------------
Go
HEADER:
opcode = QUERY, id = 2, rcode = NOERROR
header flags: response, auth. answer, want recursion, recursion avail.
questions = 1, answers = 2, authority records = 0, additional = 0
QUESTIONS:
A.domain.com, type = A, class = IN
ANSWERS:
-> A.domain.com
type = CNAME, class = IN, dlen = 14
canonical name = OWAServer.domain.com
ttl = 3600 (1 hour)
-> OWAServer.domain.com
type = A, class = IN, dlen = 4
internet address = XXX.XXX.XXX.XXX (my comment: internal IP of the server)
ttl = 1200 (20 mins)
------------
Name: OWAServer.domain.com
Addres
Aliases: A.domain.com
> A.domain.com
Server: DNSServer.domain.com
Addres
------------
SendRequest(),
HEADER:
opcode = QUERY, id = 3, rcode = NOERROR
header flags: query, want recursion
questions = 1, answers = 0, authority records = 0, additional = 0
QUESTIONS:
A.domain.com.domain.com, type = A, class = IN
------------
------------
Go
HEADER:
opcode = QUERY, id = 3, rcode = NXDOMAIN
header flags: response, auth. answer, want recursion, recursion avail.
questions = 1, answers = 0, authority records = 1, additional = 0
QUESTIONS:
A.domain.com.domain.com, type = A, class = IN
AUTHORITY RECORDS:
-> domain.com
type = SOA, class = IN, dlen = 44
ttl = 3600 (1 hour)
primary name server = DNSServer.domain.com
responsible mail addr = netgroup.domain.com (my comment: I dont know what this is, put there by previous admin maybe)
serial = 140046
refresh = 900 (15 mins)
retry = 600 (10 mins)
expire = 604800 (7 days)
default TTL = 900 (15 mins)
------------
------------
Se
HEADER:
opcode = QUERY, id = 4, rcode = NOERROR
header flags: query, want recursion
questions = 1, answers = 0, authority records = 0, additional = 0
QUESTIONS:
A.domain.com.domain.com, type = A, class = IN
------------
------------
Go
HEADER:
opcode = QUERY, id = 4, rcode = NOERROR
header flags: response, want recursion, recursion avail.
questions = 1, answers = 1, authority records = 0, additional = 0
QUESTIONS:
A.domain.com.domain.com, type = A, class = IN
ANSWERS:
-> A.domain.com.domain.com
type = A, class = IN, dlen = 4
internet address = XXX.XXX.XXX.XX (my comment: some internet IP of our service provider)
ttl = 555 (9 mins 15 secs)
------------
Non-authoritat
Name: A.domain.com.domain.com
Add
Did you run nslookup from the server itself or from a client? The reason I ask is that it appears that the problem may be with the resolver (client) rather than the server. The nslookup output shows exactly what it should for the hostname-only query. For the FQDN query, however, it shows the resolver sending the query with the extra suffix appended and the server responding with NXDOMAIN and the SOA record for the domain (normal behavior, and that's what "netgroup.domain.com" refers to - it's the e-mail address in the domain's SOA record, with the @ sign changed to a dot). Everything's OK so far, but then the resolver submits a second query, again with the additional suffix appended. This isn't normal; the second query should have that additional suffix stripped out.
Do you get the same results when you run nslookup directly on the server or from a different client?
I tried from the server some time back and again it gives me the same output as before.
Also found out two additional things:
1) When i do nslookup on the server or client on the domain , and type the FQDN of any host (A.domain.com), it adds an additional domain name at the end and give me a non authorative answer. But if i type A.domain.com. (the root dot at the end) it gives me the actual IP.
2) When i ping A.domain.com (fqdn), from DNS server or any client it resolves it properly.. but when i do nslookup it adds that additional domain name and gives me that problem.
I have to admit, this one's got me baffled. I believe you mentioned earlier that you have other DNS servers in your domain. If you run nslookup against a different server, do you get the same results? Also, if you run "ipconfig /all" on the client, is there anything unusual in the DNS suffix search list?
After doing a little experimentation in a test environment, I'm starting to think this has more to do with nslookup's somewhat quirky behavior than a problem on the DNS server. I was not aware until now that there are two different settings in nslookup that control whether or not it appends suffixes to unqualified queries before submitting them. The "set [defname|nodefname]" command tells nslookup whether or not to append the primary DNS suffix to a single-label query, while the "set [search|nosearch]" command controls whether suffixes in the search list get appended to an unqualified multi-label query (e. g., a full DNS domain name without a trailing dot). Both of these settings default to yes, as "set all" will show, which is why you get queries like a.domain.com.domain.com if you don't include the trailing dot. Try "set nosearch" and re-run your query. The output should look cleaner, at least.
That having been said, something odd is still happening on your side, and nslookup isn't giving enough output, even in d2 mode, to determine whether the fault lies with the client or the server. Since it's happening with different clients and different servers, we still don't know. I'm really interested in knowing where that ISP server's address is coming from, so try one other thing: run the "set norecurse" command and run your query again. This should keep your server from querying other servers if it can't resolve your query. If you still get a response containing that ISP address, it's coming from somewhere on your server. If that's the case, look through DNS carefully for any record containing that address. If you don't get a response with that address, then it's probably a catch-all in your ISP's DNS and can be ignored for troubleshooting purposes.
3 Ways to Join
Business Accounts
- Perfect for organizations
- Multiple users
- Save over 36%
- Create a Business Account
Answer for Membership
- Earn free access
- Showcase your knowledge
- No credit card required
- Sign Up to Answer
Loading Advertisement...
by: demazterPosted on 2009-08-16 at 03:14:56ID: 25108432
Check the DNS suffix on the computers TCP/IP settigs under advanced. Make sure it matches your domain name.