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Windows Server 2008 R2 Thread, Domain Controller DNS issue - No internet for us all.. in Technical; Looks like I lost internet connection on our network. I'm certain that it's our domain controllers but I can't see ...
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    jmair's Avatar
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    Domain Controller DNS issue - No internet for us all..

    Looks like I lost internet connection on our network. I'm certain that it's our domain controllers but I can't see why it has stopped working at 3am a week ago.
    I've been looking for the root of this problem and can not find it. Hoping an extra pair of eyes (you) may have a suggestion.

    Here's what I know
    • My laptop pointing to the gateway and using our isp as a dns gets internet. So this is not an isp issue.
    • Both domain controllers can ping eachother and from what I can tell, everything internally works fine.
    • nslookup msn.com often times out.. then out of nowhere it returns just fine.
    • firewall and filter have been taken out of the loop (I was really hoping one of them were causing the problem)
    • Domain controllers have timeout errors on the forwarders - the ISP dns server ips. ISP confirmed they should be fine.
    • No recent changes have been made.



    PDC: 10.1.1.2
    BDC: 10.1.1.0

    Here is the ipconfig /all of my PDC

    Windows IP Configuration

    Host Name . . . . . . . . . . . . : como2010
    Primary Dns Suffix . . . . . . . : parkcounty.int
    Node Type . . . . . . . . . . . . : Hybrid
    IP Routing Enabled. . . . . . . . : No
    WINS Proxy Enabled. . . . . . . . : No
    DNS Suffix Search List. . . . . . : parkcounty.int


    Ethernet adapter Local Area Connection:

    Connection-specific DNS Suffix . :
    Description . . . . . . . . . . . : Broadcom NetXtreme Gigabit Ethernet
    Physical Address. . . . . . . . . : 00-14-5E-EB-00-D3
    DHCP Enabled. . . . . . . . . . . : No
    Autoconfiguration Enabled . . . . : Yes
    IPv4 Address. . . . . . . . . . . : 10.1.1.2(Preferred)
    Subnet Mask . . . . . . . . . . . : 255.255.248.0
    Default Gateway . . . . . . . . . : 10.1.1.254
    DNS Servers . . . . . . . . . . . : 10.1.1.0
    10.1.1.2
    127.0.0.1
    NetBIOS over Tcpip. . . . . . . . : Enabled


    Thank you kindly for any suggestions!

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    jmair's Avatar
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    Here's an example if it acting wierd. Forwarders may resolve, but connection clearly isn't reliable. ((from my machine though at the same d-mark and same gateway, I have no issues.))
    Attachment 17748

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    plexer's Avatar
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    What does the result of tracert from one of the dc's to say google.com give?

    Ben

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    nslookup google.com
    Server: como2012.parkcounty.int
    Address: 10.1.1.0

    DNS request timed out.
    timeout was 2 seconds.
    DNS request timed out.
    timeout was 2 seconds.

    ------
    tracert google.com
    Unable to resolve target system name google.com

    [*] DNS services up and running. Forgot to add that in the op

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    I had an odd issue when RM changed an IP address of their server. I needed to remove the old ip and manually add the new one in DNS forwarders.

    Not much of a dns wizard but it may help.

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    plexer's Avatar
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    Quote Originally Posted by jmair View Post
    nslookup google.com
    Server: como2012.parkcounty.int
    Address: 10.1.1.0

    DNS request timed out.
    timeout was 2 seconds.
    DNS request timed out.
    timeout was 2 seconds.

    ------
    tracert google.com
    Unable to resolve target system name google.com

    [*] DNS services up and running. Forgot to add that in the op
    What version of server are you running?

    You really have a server with .0 ip address?

    Ben

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    jmair's Avatar
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    Quote Originally Posted by edutech4schools View Post
    I had an odd issue when RM changed an IP address of their server. I needed to remove the old ip and manually add the new one in DNS forwarders.

    Not much of a dns wizard but it may help.
    I just tried that. I added my ISP secondary DNS servers.. You know when you input the ips and it resolves the fqdn quickly, this takes a very long time. On the server, I'm pinging another network device ping (10.1.1.12 -t) and see no delay or drops.

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    jmair's Avatar
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    Quote Originally Posted by plexer View Post
    What version of server are you running?

    You really have a server with .0 ip address?

    Ben
    Windows Server 2008 R2 Standard.. And yes.. My BDC is 10.1.1.0.. best practice analyzer hasn't yelled at me yet =)

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    twin--turbo's Avatar
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    From Server...

    what happens when you ping 8.8.8.8 ?

    Rob
    Last edited by twin--turbo; 5th April 2013 at 07:06 PM.

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    twin--turbo's Avatar
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    what happens when you

    telnet 8.8.8.8 53

    and

    telnet 8.8.8.8 54

    Rob

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    plexer's Avatar
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    Quote Originally Posted by jmair View Post
    Windows Server 2008 R2 Standard.. And yes.. My BDC is 10.1.1.0.. best practice analyzer hasn't yelled at me yet =)
    Ok just got confused with you reffering to them as a pdc and bdc as there is no longer such a thing anymore all 2008 R2 are full replica domain controllers.

    DNS is configure and replicated on both servers?

    Ben

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    jmair's Avatar
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    Quote Originally Posted by twin--turbo View Post
    From Server...

    what happens when you ping 8.8.8.8 ?

    Rob
    times out. My laptop going through the same gateway pings it just fine. Somethings funky on the server for sure. Also double checked, Windows Firewall service is disabled and stopped.

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    plexer's Avatar
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    What happens if you set dns on server to be just 8.8.8.8 and then try to ping it?

    Default gateway on servers is correct?

    DNS forwarders in DNS are set correctly?

    Ben

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    twin--turbo's Avatar
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    Quote Originally Posted by jmair View Post
    times out. My laptop going through the same gateway pings it just fine. Somethings funky on the server for sure. Also double checked, Windows Firewall service is disabled and stopped.

    So it's not a DNS issue then.

    Tracert to 8.8.8.8 , see where it gets to.

    Do it on the other server as well.


    Rob

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    jmair's Avatar
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    Quote Originally Posted by plexer View Post
    What happens if you set dns on server to be just 8.8.8.8 and then try to ping it?

    Default gateway on servers is correct?

    DNS forwarders in DNS are set correctly?

    Ben
    Thanks for the help guys. I am very grateful.

    When I set the servers nic dns to 8.8.8.8 I can ping 8.8.8.8

    default gateway is fine. double checked dns forwarders and even swapped with isp second set of dns servers to see if that would make any difference.

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