Re: Phantom DNS server
From: Ace Fekay [MVP] (PleaseSubstituteMyActualFirstName&LastNameHere_at_hotmail.com)
Date: 08/27/04
- Next message: Rodolfo: "Re: My remote office cannot request my DNS"
- Previous message: BillB: "Re: IPCONFIG /registerdns fails!"
- In reply to: Dilan Weerasinghe: "Re: Phantom DNS server"
- Messages sorted by: [ date ] [ thread ]
Date: Fri, 27 Aug 2004 09:22:17 -0400
In news:4df8d57a.0408261146.354d51da@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:<u7FbX92iEHA.2052@TK2MSFTNGP15.phx.gbl>...
>> In news:4df8d57a.0408260441.3946cd3a@posting.google.com,
>> Dilan Weerasinghe <dilanw77@hotmail.com> wrote their comments
>> Then Kevin replied below:
>>> Hi NG,
>>>
>>> We have noticed that several of our PC's suddenly seem to
>>> lose their ability to browse the net, connect to our
>>> Exchange server etc. Basic troubleshooting showed that
>>> although the actual connectivity was there, name
>>> resolution seemed to be causing the problem, i.e. we
>>> could ping internally/externally by IP address but not by
>>> name.
>>>
>>> Checking the IPCONFIG showed that these machines, which
>>> are all set to DHCP, seemed to be picking up a phantom
>>> DNS server as opposed to the correct one, e.g.
>>> 192.168.1.12 as opposed to 192.168.1.1
>>>
>>> Rebooting the machines resolves the problem.
>>>
>>> When we try to ping the phantom DNS server, we do not get
>>> a reply. That address itself is excluded from our DHCP
>>> range and is not currently being used, so i have no idea
>>> why these workstations are picking this same address all
>>> the time.
>>>
>>> Has anyone experienced this before, or have any
>>> pointers?? All other settings in IPCONFIG are correct,
>>> and we have not made any changes to our
>>> infrastructure/architecture recently.
>>
>> It is possible for your clients to get the DNS address from a Group
>> policy, it would not show in the ipconfig /all but when running
>> nslookup you will get it.
>> You're saying that there is no machine at 192.168.1.12?
>> And that the DHCP server is publishing the address of the local DNS
>> server 192.168.1.1 and not the IP of the router?
>> Are you using DHCP on the server or the router? (if you have a
>> router)
>>
>>
>>
> Thanks for the reply.
>
> No, there is no machine at all on 192.168.1.12, and the DHCP server is
> configured correctly to give a DNS server address of 192.168.1.1.
> We are using a DHCP server that has a different address altogether.
>
> The strange thing is that this switch happens whilst a user is logged
> on and has been for a while...not on machine start up or logon.
>
> Any ideas?
>
> Dilan
I think we're going to need more info to help you out on this one.
Is 192.168.1.1 your router? If it is, is it a Windows machine or a 3rd party
router?
If you disable DHCP on the 192.168.1.1 machine, and then do an ipconfig
/release and then an ipconfig /renew, what DHCP server shows up in the
ipconfig /all?
Honestly, if 192.168.1.1 is not a Windows machine, it would be to your
advantage, and to AD and DNS' advantage, to use a Windows machine for DHCP
and DNS, since the two services and APIs are tied together for proper
dynamic registration performance and reliability.
If this is a Windows DHCP, did you set the Scope Option 006 and Server
Option 006?
-- 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: Rodolfo: "Re: My remote office cannot request my DNS"
- Previous message: BillB: "Re: IPCONFIG /registerdns fails!"
- In reply to: Dilan Weerasinghe: "Re: Phantom DNS server"
- Messages sorted by: [ date ] [ thread ]
Relevant Pages
|
