Need help on a strange dns client issue

Discussion in 'Windows Networking' started by periphonics_jphaneuf, Nov 6, 2006.

  1. Hi,

    I have encountered a strange problem with one of my customer's win2k
    systems. For some reason the system can't ping some computers on the
    network by hostname, but it can ping the same computer by IP address.
    When pinging by hostname, I get the "Unknown host" message. I did a
    ipconfig /displaydns and this is all that comes back despite the host
    file having all kinds of entries (not newly added):


    c:\>ipconfig /displaydns


    Windows 2000 IP Configuration


    c:\>


    If I stop the DNS Client service however, I can ping the host by
    hostname. After restarting the DNS Client service, the displaydns
    shows the same. I then tried ipconfig /flushdns, but that doesn't
    change the displaydns output either. I rebooted the system and
    everything was back to normal and I could ping by hostname.


    Does anyone know what could cause the DNS Resolver cache to get in this

    seemingly empty state?


    Thanks,
    J Phaneuf
     
    periphonics_jphaneuf, Nov 6, 2006
    #1
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  2. Any errors if using nslookup command?

    Bob Lin, MS-MVP, MCSE & CNE
    Networking, Internet, Routing, VPN Troubleshooting on http://www.ChicagoTech.net
    How to Setup Windows, Network, VPN & Remote Access on http://www.HowToNetworking.com
    Hi,

    I have encountered a strange problem with one of my customer's win2k
    systems. For some reason the system can't ping some computers on the
    network by hostname, but it can ping the same computer by IP address.
    When pinging by hostname, I get the "Unknown host" message. I did a
    ipconfig /displaydns and this is all that comes back despite the host
    file having all kinds of entries (not newly added):


    c:\>ipconfig /displaydns


    Windows 2000 IP Configuration


    c:\>


    If I stop the DNS Client service however, I can ping the host by
    hostname. After restarting the DNS Client service, the displaydns
    shows the same. I then tried ipconfig /flushdns, but that doesn't
    change the displaydns output either. I rebooted the system and
    everything was back to normal and I could ping by hostname.


    Does anyone know what could cause the DNS Resolver cache to get in this

    seemingly empty state?


    Thanks,
    J Phaneuf
     
    Robert L [MVP - Networking], Nov 6, 2006
    #2
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  3. Robert,

    I neglected to say that the system is not setup to reference a DNS
    server. The system only talks to a few local systems for it's
    particular operations so there's no need for a DNS server, so basically
    only the hosts file is used.

    Thanks,
    Jason
     
    periphonics_jphaneuf, Nov 6, 2006
    #3
  4. Thank you for the update.

    Bob Lin, MS-MVP, MCSE & CNE
    Networking, Internet, Routing, VPN Troubleshooting on http://www.ChicagoTech.net
    How to Setup Windows, Network, VPN & Remote Access on http://www.HowToNetworking.com
    Robert,

    I neglected to say that the system is not setup to reference a DNS
    server. The system only talks to a few local systems for it's
    particular operations so there's no need for a DNS server, so basically
    only the hosts file is used.

    Thanks,
    Jason
     
    Robert L [MVP - Networking], Nov 6, 2006
    #4
  5. Any ideas? Anyone?
     
    periphonics_jphaneuf, Nov 8, 2006
    #5
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