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DNS Resolving local Names as external IP address

Posted on 2010-09-23
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Last Modified: 2012-05-10
This occures randomly through out the day. All workstations have experienced it. It usually only lasts for a few minutes or until I flush and register the DNS on the workstation.

This is a standard SBS 2003 server that does DHCP, DNS, File serving, print serving. Just basic stuff.

I have scoured through the DNS settings, they seem ok. I have also checked the firewall to make sure DNS is disabled on it.

In the example below it should be resolve 192.168.4.233
Example:
C:\Documents and Settings\user>ping server01

Pinging p12p-i.geo.vip.re4.yahoo.com [216.39.57.107] with 32 bytes of data:

Reply from 216.39.57.107: bytes=32 time=86ms TTL=52
Reply from 216.39.57.107: bytes=32 time=109ms TTL=52
Reply from 216.39.57.107: bytes=32 time=96ms TTL=52

Ping statistics for 216.39.57.107:
Packets: Sent = 3, Received = 3, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 86ms, Maximum = 109ms, Average = 97ms
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Question by:demmons-ssit
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4 Comments
 
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Accepted Solution

by:
Darius Ghassem earned 500 total points
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Make sure you are only pointing to the SBS server only within the TCP\IP settings of the clients and server.
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Expert Comment

by:markusdamenous
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Check the hosts file also.

C:\Windows\System32\Drivers\etc

Should only really need to have localhost in there as an entry, anything is prob. suspicious.
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Author Comment

by:demmons-ssit
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Just fixed it... This was a doozey!

The DNS settings all look fine on the server.

I checked DHCP and there was an entry for two external IP addresses as secondary DNS servers being dished out to workstations. So every workstation could browse the intertubes even if the server went down. Mind you I just took over this environment, don't know what the previous sys admin was thinking. The two Public IP's set as DNS servers for workstations were from CBeyond and a DSL company.

Looking at the A records for the company website host name I noticed an odd A record that was resolving *.DomainName.com to the Yahoo IP in the OP.

Basically the path and randomness looked like this...
Server was overloaded with requests, the workstation tapped its secondary DNS, the secondary DNS can resolve *.domainname.com so it was resolving private hostnames as that public Yahoo IP. The local DNS server finally cools off from requests and the clients revert back to primary DNS.

I can confirm the fix, the DNS path and everything but the workstations flipping to secondary DNS. I don't know how to track that.

Thanks guys!
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Author Closing Comment

by:demmons-ssit
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Thank you, checking the DNS settings using ipconfig /all did indeed show the two extra public IP's under the secondary DNS field. Which is what I believe you were trying to convey here.
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