+ Post New Thread
Results 1 to 9 of 9
Wireless Networks Thread, Possible DNS problem? in Technical; I'm not sure what's going on here, so any help or suggestions would be greatly appreciated. Reasonable size network (50 ...
  1. #1

    Join Date
    Jun 2009
    Location
    Birmingham
    Posts
    598
    Thank Post
    92
    Thanked 72 Times in 64 Posts
    Rep Power
    24

    Possible DNS problem?

    I'm not sure what's going on here, so any help or suggestions would be greatly appreciated.

    Reasonable size network (50 PCs and 120 laptops, 2 DCs with DNS, DHCP) and every now and then the laptops won't log on to the network because it says it can't find the domain controller. By logging on to the local machine you can then just re attach to the domain and it's happy.
    The DNS thats being given out is for the local server and also 2 of the LA one's as second and third. It was set-up this way by the LA approved supplier, should it have been?

    Any ideas why it's doing this?

    Cheers
    Rich

  2. #2

    Join Date
    Aug 2005
    Location
    Birmingham
    Posts
    167
    Thank Post
    54
    Thanked 17 Times in 16 Posts
    Rep Power
    20
    Not sure what's going on but config your DHCP to give out the IP of the local DNS, and then config the IPs of the LA DNS as forwarders in your local DNS.

  3. Thanks to jcs808 from:

    Tricky_Dicky (10th February 2010)

  4. #3
    Cools's Avatar
    Join Date
    Jan 2009
    Location
    Bedfordshire
    Posts
    498
    Thank Post
    24
    Thanked 62 Times in 57 Posts
    Rep Power
    25
    Don't Give out the LA ones on your network.. only the one's to your local DNS server..

    then in you DNS server config the LA DNS as a forwarder's

    Jobs a good one.
    Last edited by Cools; 10th February 2010 at 08:57 AM.

  5. Thanks to Cools from:

    Tricky_Dicky (10th February 2010)

  6. #4

    Join Date
    Jun 2009
    Location
    Birmingham
    Posts
    598
    Thank Post
    92
    Thanked 72 Times in 64 Posts
    Rep Power
    24
    Thanks for the quick replies.
    Just before I do this can I just check a couple of things. I have 2 servers, both have DNS enabled, should I put there IP addresses into the DHCP DNS Server Scope (option 6) and remove the other two DNS servers that are currently in there that belong to the LA?
    The forwarders appear to have already been setup to the External DNS servers on both machines.
    Would screen dumps help explain what I mean?
    Rich

  7. #5


    Join Date
    Dec 2005
    Location
    In the server room, with the lead pipe.
    Posts
    4,619
    Thank Post
    275
    Thanked 777 Times in 604 Posts
    Rep Power
    223
    Quote Originally Posted by Tricky_Dicky View Post
    Thanks for the quick replies.
    Just before I do this can I just check a couple of things. I have 2 servers, both have DNS enabled, should I put there IP addresses into the DHCP DNS Server Scope (option 6) and remove the other two DNS servers that are currently in there that belong to the LA?
    Yes

    Also, check that the two internal DNS servers only have themselves in their DNS settings (127.0.0.1)

  8. Thanks to pete from:

    Tricky_Dicky (10th February 2010)

  9. #6

    Michael's Avatar
    Join Date
    Dec 2005
    Location
    Birmingham
    Posts
    9,241
    Thank Post
    239
    Thanked 1,567 Times in 1,249 Posts
    Rep Power
    339
    Reasonable size network (50 PCs and 120 laptops, 2 DCs with DNS, DHCP) and every now and then the laptops won't log on to the network because it says it can't find the domain controller.
    If it was a DNS problem it would affect more than just the laptops, but workstations too. Your problem undoubtedly is wireless authentication and/or DHCP related and not DNS related.

    If you can find a laptop which cannot find the domain, logon to it locally and have a look at the wireless settings and whether the machine has an IP and whether you can ping your DC.

  10. #7
    Cools's Avatar
    Join Date
    Jan 2009
    Location
    Bedfordshire
    Posts
    498
    Thank Post
    24
    Thanked 62 Times in 57 Posts
    Rep Power
    25
    The other thing to look at Wifi wise on the laptops ..
    Only use MS wifi Client, not a 3rd party one like Intel Pro Wi client..
    also un join it from the domain and rejoin it over the wifi..
    some times in you do it on the Wired NIC it look there 1st for the domin .
    and take 5 min to swap over to Wifi..

    and a good set up on the DNS will save problems.

    all client's DNS and server's DNS should look for the Local DNS servers only, it's like asking a friend for direction to loo in your house that has never been to.

  11. #8

    Join Date
    Aug 2005
    Location
    London
    Posts
    3,154
    Thank Post
    114
    Thanked 527 Times in 450 Posts
    Blog Entries
    2
    Rep Power
    123
    Quote Originally Posted by Michael View Post
    If it was a DNS problem it would affect more than just the laptops, but workstations too. Your problem undoubtedly is wireless authentication and/or DHCP related and not DNS related.
    It might be a wireless problem but he has far more laptops than desktops so he's going to see intermittent problems like this more frequently on laptops than desktops.

    The DNS settings are wrong so it does make sense to fix them; even if this turns out to be an issue with the wireless network, it does no harm to fix things which you know are wrong.

  12. #9

    Join Date
    Jun 2009
    Location
    Birmingham
    Posts
    598
    Thank Post
    92
    Thanked 72 Times in 64 Posts
    Rep Power
    24
    Quote Originally Posted by Cools View Post
    it's like asking a friend for direction to loo in your house that has never been to.
    That's a great analogy.

    I first thought the problem would be a wireless one, but I can't see how it could be. We use a Ruckus system and all the clients have had the 3rd party software removed so it only uses the Windows one. The only wireless that is in there is the Ruckus one and the children/teachers have no access to change anything like that.

    Could there be some external factor changing the wireless settings or blocking the authentication?

    As srochford said it happens a lot more on the laptops and I hadn't had a reported case on the desktops until this morning when I tried to log on I got the "domain could not be contacted". I'm presuming that the way DNS servers work, like most servers, is that they try and give out the correct information but if that server is to busy at the time then the next DNS server in the entry will try and process the request. Hence why when a class of 30 laptops log on the server can only handle so much and the incorrect DNS was being used.

    Rich
    Last edited by Tricky_Dicky; 10th February 2010 at 11:54 AM.

SHARE:
+ Post New Thread

Similar Threads

  1. AD / DNS problem
    By Number6 in forum Windows Server 2000/2003
    Replies: 4
    Last Post: 24th June 2009, 01:03 PM
  2. DNS Problem
    By john in forum Windows
    Replies: 4
    Last Post: 25th April 2008, 07:44 PM
  3. DNS problem
    By ful56_uk in forum Windows
    Replies: 3
    Last Post: 23rd April 2008, 08:07 AM
  4. DNS Problem?
    By john in forum Wireless Networks
    Replies: 6
    Last Post: 13th April 2006, 11:37 PM
  5. DNS problem?
    By kingswood in forum Wireless Networks
    Replies: 9
    Last Post: 31st August 2005, 03:52 PM

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •