Re: Phantom DNS server
From: Ace Fekay [MVP] (PleaseSubstituteMyActualFirstName&LastNameHere_at_hotmail.com)
Date: 09/01/04
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Date: Wed, 1 Sep 2004 18:33:36 -0400
In news:4df8d57a.0409010322.54ea37fb@posting.google.com,
Dilan Weerasinghe <dilanw77@hotmail.com> made a post then I commented below
> "Kevin D. Goodknecht Sr. [MVP]" <admin@nospam.WFTX.US> wrote in
> message news:<#1uHXD2jEHA.1764@TK2MSFTNGP10.phx.gbl>... <snip>
>>> Ace,
>>>
>>> To clarify;
>>>
>>> Our network is configured as following -
>>>
>>> DHCP server: 192.168.1.1
>>> DNS Servers: 192.168.1.1/ 192.168.1.2
>>>
>>> (All above addresses are static)
>>>
>>> All workstations are set to DHCP, and I've checked the
>>> scope options
>>> on the DHCP server itself as regards DNS, and it points
>>> to the correct
>>> addresses.
>>>
>>> Our router is on a completely different address.
>>>
>>> The problem is that, randomly, users seem to lose their
>>> internet
>>> connection. As I mentioned before, the actual
>>> connectivity is there
>>> but the fault lies with name resolution as we can ping
>>> externally/internally by IP address but not by name.
>>> Checking the
>>> IPCONFIG shows that the faulty machines are picking up
>>> 192.168.1.10 as
>>> their DNS server, although all other settings are correct.
>>> Rebooting the machines solves the problem until it
>>> happens again.
>>> I understand that we could set the workstations to
>>> statically point at
>>> the correct DNS servers, however this is a workaround,
>>> not a solution
>>> and I'd like to find out what's causing this.
>>> The faulty machines always pick up x.10 as the DNS server.
>>> x.10 itself is excluded from our DHCP range for
>>> distribution, and is
>>> also not currently being used, so I have no idea why they
>>> are picking
>>> this address up as a DNS server.
>>>
>>> Many thanks for your help
>>> Dilan
>>
>> On the ipconfig for the machines with the bogus DNS address, what IP
>> do they show for the DHCP server?
>>
>> --
>> Best regards,
>> Kevin D4 Dad Goodknecht Sr. [MVP]
>> Hope This Helps
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>
> Kevin,
>
> They show the correct DHCP server (192.168.1.1). Would it have been
> different, I would have assumed we had some sort of rogue DHCP machine
> on the network giving out wrong DNS server info, but in all cases the
> faulty machines are using the correct DHCP server.
>
> Thanks
> Dilan
One question, are you using a DHCP Relay agent ?
-- Regards, Ace Please direct all replies ONLY to the Microsoft public newsgroups so all can benefit. This posting is provided "AS-IS" with no warranties or guarantees and confers no rights. Ace Fekay, MCSE 2003 & 2000, MCSA 2003 & 2000, MCSE+I, MCT, MVP Microsoft Windows MVP - Windows Server - Directory Services Security Is Like An Onion, It Has Layers HAM AND EGGS: A day's work for a chicken; A lifetime commitment for a pig. -- =================================
- Next message: Ace Fekay [MVP]: "Ok, figured it out... Re: forestdnszones and domaindnszones not listed"
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