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Host name resolution

Posted on 2009-05-06
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Last Modified: 2012-05-06
Lets skip ahead past my noob credentials and just assume thats what I am.
We have a Win2k3 Domain,
Internal domain name is local.public.com.
The External domain name is Public.com
We have a Sharepoint Server, installation was provided by our vendor. He built two portals, His and Ours. Both on Port 80.  He created a host header for His using the name, His.public.com.
I created a C-name in our DNS pointing His to server.public.com.  I also added His.Public.com to the local intranet sites in my browser.  Here's my problem: If I type in the server name into the address bar in my browser, it takes me to Our SharePoint Portal.  If I enter His.public.com into the browser, it returns "Internet Explorer cannot display the webpage".  Here's the confusing part. If I add His.public.com to my Hosts file.  It resolves to the correct portal on the server.  Any help would be greatly aprreciated.
Thanks
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Question by:gthmpd
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6 Comments
 
LVL 71

Expert Comment

by:Chris Dent
ID: 24318118

Hey,

Could you run:

nslookup His.public.com

And check the response it gives you? We'd want the IP of the server concerned there. Given that it's an alias (CNAME) it should also respond with another name, it's important that you get the IP address as well.

Chris
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Author Comment

by:gthmpd
ID: 24318424
Hey Chris,  Here's what I got after entering "nslookup  his.public.com" at a command prompt:
C:\Documents and Settings\user>nslookup his.public.com
*** Can't find server name for address 10.0.1.6: Non-existent domain
*** Can't find server name for address 10.1.1.1: Non-existent domain
*** Default servers are not available
Server:  UnKnown
Address:  10.0.1.6
*** UnKnown can't find his.public.com: Non-existent domain
the IPs shown are to our internal DNS servers
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LVL 71

Expert Comment

by:Chris Dent
ID: 24318446

Could you also try:

nslookup his.public.com 4.2.2.4

That has the query run against one of Verizon's DNS servers. It tells us if everyone else in the world is able to resolve the name.

If that doesn't work, open up the DNS Console. Do you have a Forward Lookup Zone for public.com? Or just local.public.com?

Chris
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Author Comment

by:gthmpd
ID: 24318540
Same thing:
C:\Documents and Settings\slauj>nslookup his.public.com 4.2.2.4
Server:  vnsc-pri-dsl.genuity.net
Address:  4.2.2.4
*** vnsc-pri-dsl.genuity.net can't find his.public.com: Non-existent domain

In our forward zones, we just have local.public.com.  As of now we are just trying to get this to resolve internally, if that helps.
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LVL 71

Accepted Solution

by:
Chris Dent earned 2000 total points
ID: 24318757

Okay cool.

Lets put something in place to make this work. It won't make it work from outside of your network, but that's not the goal here is it?

1. Open the DNS Console
2. Expand Forward Lookup Zones
3. Right click and select New Zone
4. Choose Primary, and you can leave AD Integrated ticked if that's an option here
5. Enter the name "his.public.com"
6. Leave Dynamic Updates disabled

I think that's all of the steps, from memory so I hope I didn't miss any.

Anyway, that gives us a zone that will answer for that name. Now we need to add a record.

7. Select his.public.com
8. Right click and select New Host (A) Record
9. Leave the name blank
10. Enter the IP Address for the server (afraid you can't use an Alias in this instance)

This will give you a record that looks like this:

(same as parent folder)   Host (A)   <IPAddress>

Now run:

ipconfig /flushdns

Then finally:

nslookup his.public.com

And:

ping his.public.com

If those work, head to the browser and see if it's good :)

Chris
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Author Closing Comment

by:gthmpd
ID: 31578601
Worked like a charm! Thanks for taking the time to walk me through this!
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