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From the network in our office, some websites are not getting resolved to their proper IP addresses. I guess it is a problem with our DNS server because, when I changed it to Google's public DNS, I was able to access all the websites. What is the solution?

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migrated from security.stackexchange.com Aug 15 '11 at 21:19

This question came from our site for Information security professionals.

closed as not a real question by womble, Zoredache, Steven Monday, Shane Madden, pauska Aug 16 '11 at 7:24

It's difficult to tell what is being asked here. This question is ambiguous, vague, incomplete, overly broad, or rhetorical and cannot be reasonably answered in its current form. For help clarifying this question so that it can be reopened, visit the help center.If this question can be reworded to fit the rules in the help center, please edit the question.

    
welcome to Information Security - but why are you asking this question here? Please see the FAQ - this site is for security questions. –  AviD Aug 15 '11 at 21:18
    
This question needs much more detail if we're to offer you any insight. –  joeqwerty Aug 15 '11 at 21:21
    
If you could tell me what details, I'll give it to you. I am sorry I am new here. –  Brahadeesh Aug 15 '11 at 21:25
    
How about: What DNS server are you running internally? How is it configured for forwarders and/or root hints? What is the configuration on the clients? What are the clients; Windows, Linux, etc. ? –  joeqwerty Aug 15 '11 at 21:27
    
Operating system, DNS software, configured forwarders, local zones, DNS configuration, network infrastructure, possible firewalls, ... . If you think something else could be valuable don't hesitate to provide this, too. –  mailq Aug 15 '11 at 21:30

2 Answers 2

up vote 1 down vote accepted

Sounds like you have created the a-records/domain on your internal DNS servers. Try doing start -> run -> nslookup

Server dnsserver1

Mysite.com

Do all DNS servers resolve the website to the same IP address? Check your hosts file. Are you using correct DNS forwarders or Root servers? Properties on the DNS servers...

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I'll ask my admin guy to look through this. Thank you. –  Brahadeesh Aug 15 '11 at 21:39

You may want to look at changing the name server for your network (e.g. at the router). I see this issue regularly with the DNS servers of a certain ISP with a name that rhymes with Vindspream. ;-)

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Could you give me a link where there are step by step instructions on how to do this ? Am a newbie. –  Brahadeesh Aug 15 '11 at 21:32
    
If the problem is with the ISP name servers, then you want to lookup the make and model of your router with keywords like "change DNS server" etc. You may prefer contacting the ISP support and they should be able to step you through this, assuming you can reach a human being by phone. –  Somantra Aug 15 '11 at 21:36
    
Thank you, will do that, though I think the sarcasm is unwarranted. –  Brahadeesh Aug 15 '11 at 21:38
2  
The sarcasm was directed towards the support line. It is often difficult to reach a human being when calling for support. Not directed towards you my friend. :-) –  Somantra Aug 15 '11 at 21:52
    
Oh. sorry then. Yeah they are difficult to reach :) –  Brahadeesh Aug 15 '11 at 21:55

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