DNS suffix is making DNS lookup problems

20 Jun 2009 1:33 AM

Stefan4321

Hello,

When router here does itâ€™s DHCP conversation with the ISP and the local
computer, the ipconfig in the local computer picks up two entries:

DNS Suffix Search List. . . . . . : sonic.net
Connection-specific DNS Suffix . : sonic.net

From reading, these entries are supposed to apply to unqualified names, but
Windows DNS is applying them to all DNS lookups and triggering extra DNS
lookups on bogus addresses. These extra lookups are making problems for
applications. Can they be turned off?

There is a registry setting:

HKLM\Software\Policies\Microsoft\Windows NT\DNSClient\AppendToMultiLabelName
Type = DWORD = 0

This is supposed to turn off the â€œDNS Suffix Search List.â€ Is there a better
way?

However, I have not been able to find a way to turn off the extra lookups
from the â€œConnection-specific DNS suffix.â€ How does one turn off the extra
â€œConnection-specific DNS suffixâ€ DNS requests?

System here is Win XP Pro SP3

Thanks

20 Jun 2009 4:55 AM

John Wunderlich

=?Utf-8?B?U3RlZmFuNDMyMQ==?= <Stefan4***@discussions.microsoft.com>
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wrote in news:2D22F4A6-C28E-4B56-88EB-FAA6BADC97DD@microsoft.com:

> Hello,
>
> When router here does itâ€™s DHCP conversation with the ISP and
> the local computer, the ipconfig in the local computer picks up
> two entries:
>
> DNS Suffix Search List. . . . . . : sonic.net
> Connection-specific DNS Suffix . : sonic.net
>
> From reading, these entries are supposed to apply to unqualified
> names, but Windows DNS is applying them to all DNS lookups and
> triggering extra DNS lookups on bogus addresses. These extra
> lookups are making problems for applications. Can they be turned
> off?
>
> There is a registry setting:
>
> HKLM\Software\Policies\Microsoft\Windows
> NT\DNSClient\AppendToMultiLabelName Type = DWORD = 0
>
> This is supposed to turn off the â€œDNS Suffix Search List.â€ Is
> there a better way?
>
> However, I have not been able to find a way to turn off the extra
> lookups from the â€œConnection-specific DNS suffix.â€ How does
> one turn off the extra â€œConnection-specific DNS suffixâ€ DNS
> requests?

Not sure if you've tried this:

"Network Connections" control panel ->
Right-click on your local area connection -> Properties
General Tab -> Scroll down to bottom of center window
Click once on "Internet Protocol (TCP/IP)" (not checkbox)
Click "Properties" -> General Tab -> Click "Advanced"
Click "DNS" tab.
Do you have "Append primary and connection specific ..." checked?

Instead, try clicking "Append these DNS suffixes (in order)" and
remove all entries from the window beneath or add the ones you want.

Then "OK" your way out of all the windows.

HTH,
John