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DNS issue

Posted on 2005-05-09
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Last Modified: 2010-04-19
On a Windows 2003 server....

After 2-3 years of working fine...all the stations on this network could no longer find www.mycompanysite.com.
The site could be accessed from outside the network, however.

The people who wrote the site  made some changes to  DNS by  adding:
Forward lookup zone:
mycompanysite.com

Under that we added:
(same as parent folder)              Mail Exchanger(Mx)             [10] mail.mycompanysite.com
Mail                                          Host [A]                              ip address
www                                        Host [A]                              same ip address

After that, the problem went away.  Before I get their explanation, I like input from this site.
Why would the above fix the problem?

I could see adding a forward lookup zone, but I am not sure why they added it the way they did.

thanks.
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Question by:glenn_1984
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Expert Comment

by:sgstuart
ID: 13964296
Hi glenn 1984,
     I am assuming that you have your own internal DNS servers as well for inside your company.   My guess is what happened is the DNS server for inside got changed somehow, and the alias to the server of the DNS name or host header is missing.

      If things on the outside have worked the whole time, which uses a different DNS server than your company, which it sounds like what you are saying.      I can not say that the above is the proper way to do things, as I am actually not in our DNS group, I am the owner of over 450 web and application servers though.   Every now and then an alias needs to be placed back in properly.    You should always test with pings and nslookup commands to make sure everything is pointing properly

ping  IP Address
ping www.mycompanysite.com
nslookup www.mycompanysite.com
nslookup IP Address

 This will make sure that all IP Addresses and names, and Aliases are pointing properly.

Thanks,
Steven Stuart
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Author Comment

by:glenn_1984
ID: 13968147
Inside, the only DNS was to the server ON the server.
The router had the DNS for the website and the ISP.
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LVL 8

Expert Comment

by:sgstuart
ID: 13969794
Hi Glenn,
      Is it possible that the router has lost that setting?
 
     If you remove what you did, what are the results of the pings and nslookups above?

Thanks,
Steven Stuart
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LVL 16

Author Comment

by:glenn_1984
ID: 13971288
Unfortunately this is a strange setup.
I am the consultant for the system from the Hub/Switch and everything inside of that.
Another companhy support the routers and the web site.

It is not too important to me to discover why it happened.

I am more interested in understanding the logic behind the configuration above.
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Accepted Solution

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sgstuart earned 2000 total points
ID: 13972017
Hi Glenn,
    Well pretty much what this says
Forward lookup zone:
mycompanysite.com

Under that we added:
(same as parent folder)              Mail Exchanger(Mx)             [10] mail.mycompanysite.com
Mail                                          Host [A]                              ip address
www                                        Host [A]                              same ip address


is on the lines with Mail and www. and being under the lookup zone mycompanysite.com
It is saying that if someone is hitting Mail.mycompanysite.com go to  the ip address (ip address)
and  if someone is hitting www.mycompanysite.com go to the ip address (ip address)

That is pretty much all the above is saying.  I am hoping that is what you wanted.


Thanks,
Steven Stuart
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