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VISTA TCP/IP DNS server entry keeps changing from dhcp assigned to fixed (internal) address

Posted on 2007-12-04
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Last Modified: 2012-06-27
I am using Vista Ultimate. When I work from home I have a local network of 192.168.250.0/24. My wireless router assigns me a dhcp lease including the DNS servers of my ISP. This works fine. However, every so often (couple of hours maybe) the DNS server entry in my Wireless Network Connection TCP/IP properties is being set to a manual address on a different network. The address is  the address of one of the SBS servers in a remote office that I visit from time to time.  My PC is a member of its own workgroup and does not access any resources on the remote network. I use Safenet SoftremoteLT VPN client to connect to remote offices and when the DNS server address has been reset there is a live connection instigated through Softremote to the remote network. If I reset the TCP/IP DNS server address to automatic all is well again. What is capable of making this change? The only thing I can find is that the remote DNS server address appears in the registry key HKLM\System\ControlSet003\Services\TCPIP\Parameters\Interfaces\{D1526EB6-DBF4-4C46-B655-FA122BFFD294} as the Nameserver entry. This is (I think) the LastKnownGood controlset (If I look in HKLM\System\Select).
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Question by:simes311
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7 Comments
 
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by:LeeTutor
ID: 20405999
I am not sure why it would be suddenly changing during a connected session (that is what you are saying, correct?) but perhaps this new capability of Vista TCP/IP has something to do with it:

http://www.lockergnome.com/windows/2007/10/30/alternate-configuration-in-vista/
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by:simes311
ID: 20406329
No joy. You are right - It does change "out of the blue" . I have ferretted through all of the TCP/IP property settings, bot V4 and V6.
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simes311 earned 0 total points
ID: 20903359
I have worked around this problem. The change to the DNS server address only occurs when / if my laptop has established a link to the remote office. I have been  able to change a setting in the softremote VPN client software so that the link to the remote office has to be established manually, rather than automatically as was previously the case. Unless someone has any other good ideas as to what could have been causing the problem I propose to close this question.
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LVL 59

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by:LeeTutor
ID: 20903563
I guess I'm the only one who logged into your question.  No objection from me; go ahead and close the question by clicking on the Delete button on the lower righthand corner of your question box; you will be taken to Community Support window where you can request that the question be either deleted or added to the Previously Answered Questions list with your points refunded because you solved it yourself.

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Expert Comment

by:REngimann
ID: 21563073
I suddenly am experiencing the same type of problem:  The DHCP assigned DNS server name(s) are changing ever 24 hours (all other DHCP settings remain the same.    I checked the DHCP server log: no activity occured (request or lease).  Any chance this has to do with the link-layer topology?  We have our own public IP block (class C) and this net has been working with XP, NT, 2000 and Vista machines for years without problems.  My guess is, a recent update to Vista may be causing this (haven't verified the KB's downloaded yet but will!)
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Expert Comment

by:Sufleu
ID: 21624643
Same issue here but with windows xp clients. Have a linux router that acts also as a dhcp server. This worked fine for the last 3 years or so. In the last couple of days i'm experiencing the same problem on a few machines (windows xp mainly but happened on a windows vista machine also). The dhcp assigned dns server entry is changed to 192.168.0.1 (my network is on 10.0.0.0/24 class) at a random interval (a couple of hours usualy) after the lease has been taken. All the other entry's assigned by dhcp are ok. No aparent activity in the dhcp server logs. This is getting frustrating.
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