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DNS A RECORD KEEPS APPEARING

    Question

  • Hi all, i posted something similar last week but i was a little unclear therefore got unclear replies.

    I have an AD integrated DNS zone.

    I have a number of servers one of which has two network cards. The two network cards are in different subnets with different IP addresses (however only one of the network cards / subnets is used the other network card should be disabled). One of my guys had a move around in the server room last week and connected the LAN cable into the wrong network card on the server.

    As a result of the above, the server (with two network cards) is now appearing in DNS with two A records (an A record for each network card / subnet). Even though the network cable has been reconnected to the correct network card and the incorrect A record has been deleted from DNS the incorrect A record reappears the next day!!

    Im not sure if i have explained this very well.

    Any suggestions would be much appreciated.

    Thanks

    Monday, February 27, 2012 2:07 PM

All replies

  • Hello,

    Please make sure that the NIC card is disabled. Delete the A record, force the AD replication between all DCs you have and check results.


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    Monday, February 27, 2012 2:14 PM
  • thank you for your reply

    I have disabled the NIC but did not force replication will this have made any difference?

    Monday, February 27, 2012 2:21 PM
  • to add to this, the server with two network cards is only a member server
    Monday, February 27, 2012 3:29 PM
  • i have just found that another device on the LAN is using the same IP address the 2nd network card was using and registering in DNS. The other device is only a windows 7 machine, the device has a totaly different name from the server so i am 100% confused now

    Monday, February 27, 2012 4:26 PM
  • Hi,

    Does the reappear A record indicate the FQDN of the member server? Please verify that the 2nd NIC was disabled, and delete the 2nd NIC IP address A record. Then, run ipconfig /registerdns on both the server and Windows 7, to see if the record reappear and which FQDN name is indicate on the record.

    Best Regards,

    Aiden



    Aiden Cao

    TechNet Community Support


    Tuesday, February 28, 2012 3:41 AM
  • i have just noticed that most devices on the network have 2 or more ip addresses in DNS!!!

    only one of the ip addresses per host is showing in dhcp but both ip addresses (shown in DNS) respond to ping

    now im lost

    Tuesday, February 28, 2012 9:55 AM
  • Hi,

    It can cause by DHCP register multiple A records on DNS, but the staled record was not deleted by DNS. Please try to enable Scavenging on DNS. It will help DNS to delete the expired records.

    Understanding aging and scavenging
    http://technet.microsoft.com/en-us/library/cc759204(WS.10).aspx

    Enable Aging and Scavenging for DNS
    http://technet.microsoft.com/en-us/library/cc755716(WS.10).aspx

    Don’t be afraid of DNS Scavenging. Just be patient
    http://blogs.technet.com/b/networking/archive/2008/03/19/don-t-be-afraid-of-dns-scavenging-just-be-patient.aspx


    Best Regards,
    Aiden


    Aiden Cao

    TechNet Community Support

    Thursday, March 01, 2012 2:27 AM