Solved

DNS issue

Posted on 2014-12-15
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Last Modified: 2015-01-03
I have something strange happening here.  Users are losing their connection to a server running a license manager for Autocad.  When this happens and I ping the license server by name from their workstation I get an ip of 216.139.250.120.  It should be 10.1.1.2 since it is set as static on that server.  If I flush the DNS cache and do an ipconfig release/renew on the workstations, the license server’s correct ip address shows, and they can open Autocad.

I just tried pinging the backup domain controller from my workstation and I get the same address, 216.139.250.120.  Any idea what is causing this?  When I look up 216.139.250.120, it shows a company called networking@hostwaydcs.com.

We use AD integrated DNS. I checked all internal DNS settings and that 216. address does not show up in forward or reverse lookup zones.

Any idea what is going on here?
  Thanks,
cja
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Question by:cja-tech-guy
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5 Comments
 
LVL 11

Expert Comment

by:rharland2009
ID: 40500470
What is the IP address of your DNS server? Is it your DC?
Is it possible there's another computer on your domain with the same IP as your DNS box?
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Author Comment

by:cja-tech-guy
ID: 40500484
The DNS servers are the DC's. They are set to static addresses that are outside the DHCP scope, so I do not think there is another machine with a  duplicate DNS server address.
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LVL 35

Expert Comment

by:Kimputer
ID: 40500541
You said "license server by name", so I assume it's not a FQDN? Is there any WINS server in place?
Any hosts file in use?
Did you do an nslookup on the client pc with that problem to be sure?
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Accepted Solution

by:
cja-tech-guy earned 0 total points
ID: 40522251
I figured it out.  DHCP server was set to use both internal and external DNS servers.  I changed the setting to only use internal DNS servers and set forwarders on them.  Issue resolved.
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Author Closing Comment

by:cja-tech-guy
ID: 40528940
The other solutions did not resolve the issue.  I posted what I did to fix the issue.

Thanks
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