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Windows Server 2008 R2 Thread, DNS only talking to static IPs? in Technical; ...
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    jmair's Avatar
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    DNS only talking to static IPs?

    Iíve been having some odd DNS issues, Iím hoping for suggestions on where to look to solve these problems.

    VBs login scripts arenít always triggering, unless the user has a static IP.

    New machines cann't join our domain, (though I do get a prompt for a user/password)
    dns_error1.png

    From new machines (with ips designated by our DHCP) I canít ping our FQDN of parkcounty.int, however the ipconfig on the machine that can not connect is as follows

    Ethernet adapter Local Area Connection:

    Connection-specific DNS Suffix . : parkcounty.int
    Link-local IPv6 Address . . . . . : fe80::b460:5249:17d7:d177%11
    IPv4 Address. . . . . . . . . . . : 10.1.2.133
    Subnet Mask . . . . . . . . . . . : 255.255.0.0
    Default Gateway . . . . . . . . . : 10.1.1.254

    Unfortunately, these DNS issues are also stopping our Web filtering appliance to work correctly and even some staff have to input their username/password to connect with Exchange several times an hour.

    Thanks in advance for any suggestions.

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    plexer's Avatar
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    Are the dns servers listed in your ipconfig output?

    Ben

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    jmair's Avatar
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    Also, when I run the Best Practices for our DNS the only error I get is that I do not have the 127.0.0.1 as my secondary dns set on the NIC.

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    jmair's Avatar
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    Quote Originally Posted by plexer View Post
    Are the dns servers listed in your ipconfig output?

    Ben
    From the new machine that wont connect, here is the full Ipconfig:


    Code:
    Windows IP Configuration
    
       Host Name . . . . . . . . . . . . : dmeads1
       Primary Dns Suffix  . . . . . . . : 
       Node Type . . . . . . . . . . . . : Hybrid
       IP Routing Enabled. . . . . . . . : No
       WINS Proxy Enabled. . . . . . . . : No
       DNS Suffix Search List. . . . . . : parkcounty.int
    
    Wireless LAN adapter Wireless Network Connection:
    
       Media State . . . . . . . . . . . : Media disconnected
       Connection-specific DNS Suffix  . : 
       Description . . . . . . . . . . . : 1x1 11b/g/n Wireless LAN PCI Express Half Mini Card Adapter
       Physical Address. . . . . . . . . : D0-DF-9A-46-50-C4
       DHCP Enabled. . . . . . . . . . . : Yes
       Autoconfiguration Enabled . . . . : Yes
    
    Ethernet adapter Local Area Connection:
    
       Connection-specific DNS Suffix  . : parkcounty.int
       Description . . . . . . . . . . . : Realtek PCIe GBE Family Controller
       Physical Address. . . . . . . . . : E8-9A-8F-8D-80-C6
       DHCP Enabled. . . . . . . . . . . : Yes
       Autoconfiguration Enabled . . . . : Yes
       Link-local IPv6 Address . . . . . : fe80::b460:5249:17d7:d177%11(Preferred) 
       IPv4 Address. . . . . . . . . . . : 10.1.2.133(Preferred) 
       Subnet Mask . . . . . . . . . . . : 255.255.0.0
       Lease Obtained. . . . . . . . . . : Tuesday, August 30, 2011 6:45:10 AM
       Lease Expires . . . . . . . . . . : Wednesday, August 31, 2011 12:45:53 PM
       Default Gateway . . . . . . . . . : 10.1.1.254
       DHCP Server . . . . . . . . . . . : 10.1.1.254
       DHCPv6 IAID . . . . . . . . . . . : 250124943
       DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-15-BE-D6-D7-E8-9A-8F-8D-80-C6
       DNS Servers . . . . . . . . . . . : 64.25.238.120
                                           64.25.227.34
                                           8.8.8.8
       NetBIOS over Tcpip. . . . . . . . : Enabled
    
    Tunnel adapter isatap.{236FC1F9-C64F-44D0-BA89-BD512AACAC7E}:
    
       Media State . . . . . . . . . . . : Media disconnected
       Connection-specific DNS Suffix  . : 
       Description . . . . . . . . . . . : Microsoft ISATAP Adapter
       Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
       DHCP Enabled. . . . . . . . . . . : No
       Autoconfiguration Enabled . . . . : Yes
    
    Tunnel adapter Local Area Connection* 11:
    
       Media State . . . . . . . . . . . : Media disconnected
       Connection-specific DNS Suffix  . : 
       Description . . . . . . . . . . . : Microsoft 6to4 Adapter
       Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
       DHCP Enabled. . . . . . . . . . . : No
       Autoconfiguration Enabled . . . . : Yes
    
    Tunnel adapter isatap.parkcounty.int:
    
       Media State . . . . . . . . . . . : Media disconnected
       Connection-specific DNS Suffix  . : parkcounty.int
       Description . . . . . . . . . . . : Microsoft ISATAP Adapter #2
       Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
       DHCP Enabled. . . . . . . . . . . : No
       Autoconfiguration Enabled . . . . : Yes
    
    Tunnel adapter Teredo Tunneling Pseudo-Interface:
    
       Connection-specific DNS Suffix  . : 
       Description . . . . . . . . . . . : Microsoft Teredo Tunneling Adapter
       Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
       DHCP Enabled. . . . . . . . . . . : No
       Autoconfiguration Enabled . . . . : Yes
       IPv6 Address. . . . . . . . . . . : 2001:0:4137:9e76:82d:f0a:f5fe:fd7a(Preferred) 
       Link-local IPv6 Address . . . . . : fe80::82d:f0a:f5fe:fd7a%28(Preferred) 
       Default Gateway . . . . . . . . . : ::
       NetBIOS over Tcpip. . . . . . . . : Disabled

  5. #5


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    DNS Servers . . . . . . . . . . . : 64.25.238.120
    64.25.227.34
    8.8.8.8
    Is this what you're using on your ones with static IPs?

    Do those DNS servers know about parkcounty.int? (they look like public DNS servers)

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    jmair's Avatar
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    Quote Originally Posted by kmount View Post
    Is this what you're using on your ones with static IPs?

    Do those DNS servers know about parkcounty.int? (they look like public DNS servers)
    First, thank you all for your quick replys.

    actually, these DNS IPs aren't anywhere on my DNS server (not even o nthe NIC configs).. They are however on my gateway. I just remoted into the gateway and disabled the VPN settings on it in case that was somehow causeing the fits. Not sure how quickly I'll see changes in my network though.

  7. #7

    Michael's Avatar
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    It looks to me you have no internal DNS - generally not a good idea, especially as you're running a network domain.

    Typically your primary DNS is the same as your DHCP server, so in your case it would look like:

    Code:
    10.1.1.254
    64.25.238.120
    64.25.227.34
    8.8.8.8

  8. #8

    plexer's Avatar
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    By the looks of it as has been said you are not giving out your domain controller / dns servers to your clients therefore active directory is not going to be working correctly.

    Ben

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    jmair's Avatar
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    Agreed. Internal DNS doesn't show. From the domain controller (Windows 2008 with AD, DNS, DHCP) client machines aren't seeing the internal DNS, and I haven't a clue why. It has been working fine for a few years, then, it has stopped.
    While at the DNS snapin, everything is running. .. Going to restart the entire network and hope that solves something.

  10. #10
    jmair's Avatar
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    Quote Originally Posted by Michael View Post
    It looks to me you have no internal DNS - generally not a good idea, especially as you're running a network domain.

    Typically your primary DNS is the same as your DHCP server, so in your case it would look like:

    Code:
    10.1.1.254
    64.25.238.120
    64.25.227.34
    8.8.8.8
    My internal DNS server has one DNS as itself, 10.1.1.2. The Second DNS (set on the nic) is 127.0.0.1.
    As far as I know, I have no ither DNS server listed on my DNS server. If you have an idea where to look to double check this, I'll look, but I don't know why or where they would be.

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    plexer's Avatar
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    Is DNS being set using server option on your dhcp server?

    Your clients should only have you AD/DNS server ip's as their DNS and no others.

    Ben

  12. #12
    jmair's Avatar
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    Quote Originally Posted by plexer View Post
    Is DNS being set using server option on your dhcp server?
    Ben
    Yes, Name Servers, DNS Servers and DNS Domain Name.
    Quote Originally Posted by plexer View Post
    Your clients should only have you AD/DNS server ip's as their DNS and no others.
    Ben
    Agreed. This has only recently changed. I think some clients are grabbing that info from our gateway. Not sure why they aren't getting it from the DNS server.

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    I have had it where some of my clients get strange DNS addresses. I figured out that it was due to a rogue device dishing out DHCP requests on my VLAN. The only thing that I can figure was happening was that the correct DHCP server was responding in time for the IP to be assigned and then some how the other server's response dished out the DNS.

    Check that DHCP isn't enabled on any other device on your network. First place I would look would be your gateway as its where you have seen the IP for those DNS servers before.

    Things like Internet Connection Sharing on a client will set up a crude DHCP server on that client.

    Alternately depending on your standard lease time from your DHCP you could temporarily stop the DHCP service. Then run ipconfig /release & ipconfig /renew on a client and see if it still gets a response (if it does then the IP of the DHCP Server will be your culprit)
    Last edited by iMash; 31st August 2011 at 11:35 AM.

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    Michael's Avatar
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    Quote Originally Posted by jmair View Post
    My internal DNS server has one DNS as itself, 10.1.1.2. The Second DNS (set on the nic) is 127.0.0.1.
    As far as I know, I have no ither DNS server listed on my DNS server. If you have an idea where to look to double check this, I'll look, but I don't know why or where they would be.
    Normally any Active Directory domain uses DNS integrated (by default), so this would apply to 2000/2003 and 2008 Server. If you navigate to Start > Administrative Tools > DHCP, expand the menu on the left until you see IPv4. Then expand 'Scope' and click 'Scope Options'.

    There should be the following entries listed on the right:

    003 Router
    006 DNS Servers
    015 DNS Domain Name

    Double click to open '006 DNS Servers'. Now according to the information you've given, I want you to enter these addresses in this order:

    Code:
    10.1.1.254
    10.1.1.2
    64.25.238.120
    64.25.227.34
    8.8.8.8
    Apply changes, then close DHCP Server.

    Manually re-adjust your DNS settings on your server NIC to match the above. This basically means everything in your domain will talk to your on site server, before talking to the outside world.

    Now restart a few of your workstations and hopefully they should logon correctly. Once logged in a workstation, open up a command prompt and enter:

    Code:
    ipconfig /all
    Your IP configuration should look the same as specified above (for DNS servers). Hope this helps.

  15. #15
    jmair's Avatar
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    turns out my DHCP was currupted. Backing up the DHCP db, removing and reinstalling DHCP was the only answer, but it worked. Thank you all for the assistance!

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