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A DNS Problem ?

Hello,
         We have a domain of 3 windows 2000 advanced servers and 20 clients running anything from windows 98 to windows xp, we are having a problem with 2 of the computers seeing one of the servers,  the first being a windows 2000 professional system and when she double clicks on network places > entire network > entire contents > microsoft windows network > domain > she gets a listing of all the machines on the network fine, when she clicks on server-1 the system comes up and says \\server-1 is not accessible - the network path was not found, the other machine is windows xp and does about the same thing, all the other machines see and access the server-1 just fine, if she continues to click on the server-1 icon under the listing it does eventually come up with the drives and shares (same with the xp system), is this a dns problem on the server-1 ? (i am inclined not to think so since other computers see it fine) or are these 2 clients at fault (more inclined to believe this) and how does one trace the clients access back to the server to see where the problem is ?


P.S. Server-1 is the domain primary and the dns server.

Thanks
Eric.
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eenderle
Asked:
eenderle
1 Solution
 
Fatal_ExceptionCommented:
When a resource cannot be found, that usually means DNS, but it could also be that the Arp Request is not being returned correctly.  Computers communicate (via TCP/IP) using Mac Addresses, not IPs.  If the Arp request is not returned, then the resource is known as being Not Assessible.  First thing I would do is:

1.  Make sure the DNS server is correct in the IP Configuration of the system.
2.  Ck the DNS entries of your DNS Server.
3.  Open a Command Shell on the subject computer and check the Arp Cache (Arp -a).  Do this on a system that is working too, so you can compare the entries.  Note that the Arp Cache is held for 10 minutes by default on a Windows OS.
4.  If you are running at Half Duplex, and are using a Switch, try forcing Full Duplex to eliminate Collisions on the network.  Arp Requests are Broadcasts, and if collisions are occuring, the request may be getting 'backed off' by the collision.  

To really see the Arp Request in action, you could also install a packet sniffer on the system (ethereal) and see if the Arp Request is being returned successfully...

FE
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sweatbeastCommented:
rule out dns - can the affected PC ping the server1
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eenderleAuthor Commented:
Sweatbeast,
                     yeah, the system can ping server-1 fine, and the arp reports back the same as the other systems.....

Eric.
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eenderleAuthor Commented:
Also,
           I checked the network card hardware and the card is a 3com with 2 entrys,

1 - 3com etherlink xl 10/100 pci for complete pc management (3c905c-tx)
2 - 3com etherlink xl 10/100 pci for complete pc management (3c905c-tx) - deterministic network enhancer miniport

after checking the settings for both i found on the 1st one a box that was checked that said,

allow the computer to turn of this device to save power, i have unchecked this box to see if this may be the problem....

Eric.


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Fatal_ExceptionCommented:
Let us know if that worked...  I never understood why anyone would want to turn off the NIC to try to save power!  Probably saving a nickel a year by doing that..  :)
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eenderleAuthor Commented:
Appears to have had no effect, still having same problem, let me know if anyone has any ideas...??

Eric.
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Bob LambersonSoftware EngineerCommented:
Assume you have reinstalled any drivers, and there are some utilities here http://www.3com.com/products/en_US/detail.jsp?tab=support&pathtype=support&sku=3C905C-TX-M
that may help if you haven't already tried them.


Bob
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eenderleAuthor Commented:
Bob,
         Have not tried the new drivers , will try tonight..

Eric.
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eenderleAuthor Commented:
Bob,
      Loading new drivers resolved problem so far..


Thanks
Eric.
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