wierd dns suffix search behavior

Discussion in 'DNS Server' started by fred stover, Jan 18, 2007.

  1. fred stover

    fred stover Guest

    This has been bothering me for awhile so thought I would do some research:

    If I ping an invalid machine name it ends up tryng to resolve to
    xxx.imnonline.net and it always returns a valid ip address of a server in
    our domain: 192.168.2.13
    this is troublesome when rdp'ng and mispell the server name (as an example)

    Pinging xxx.imnonline.net [192.168.2.13] with 32 bytes of data:

    Reply from 192.168.2.13: bytes=32 time<1ms TTL=128
    Reply from 192.168.2.13: bytes=32 time<1ms TTL=128
    Reply from 192.168.2.13: bytes=32 time<1ms TTL=128
    Reply from 192.168.2.13: bytes=32 time<1ms TTL=128

    It never returns: host not found.

    I think I need to remove imnonline.net from the search list but have no idea
    what is putting it there, dhcp scope adds corp.imnonline.net only once. And
    it's not set on the nic. Any thoughts?

    Windows IP Configuration

    Host Name . . . . . . . . . . . . : nameless
    Primary Dns Suffix . . . . . . . : corp.imnonline.net
    Node Type . . . . . . . . . . . . : Hybrid
    IP Routing Enabled. . . . . . . . : No
    WINS Proxy Enabled. . . . . . . . : No
    DNS Suffix Search List. . . . . . : corp.imnonline.net
    corp.imnonline.net
    imnonline.net

    Ethernet adapter Local Area Connection:

    Connection-specific DNS Suffix . : corp.imnonline.net
    Description . . . . . . . . . . . : Broadcom 570x Gigabit Integrated
    Con
    troller
    Physical Address. . . . . . . . . : 00-12-3F-13-51-E4
    Dhcp Enabled. . . . . . . . . . . : Yes
    Autoconfiguration Enabled . . . . : Yes
    IP Address. . . . . . . . . . . . : 192.168.2.101
    Subnet Mask . . . . . . . . . . . : 255.255.255.0
    Default Gateway . . . . . . . . . : 192.168.2.3
    DHCP Server . . . . . . . . . . . : 192.168.2.23
    DNS Servers . . . . . . . . . . . : 192.168.2.23
    192.168.2.11
    Lease Obtained. . . . . . . . . . : Thursday, January 18, 2007
    11:05:10
    AM
    Lease Expires . . . . . . . . . . : Friday, January 19, 2007
    11:05:10 AM


    nslookup:

    Default Server: shared.corp.imnonline.net
    Address: 192.168.2.23
    Server: shared.corp.imnonline.net
    Address: 192.168.2.23

    Non-authoritative answer:
    Name: xxx.imnonline.net
    Address: 192.168.2.13
     
    fred stover, Jan 18, 2007
    #1
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  2. Read inline,
    In
    This is a Wildcard record in the public zone for imnonline.com
    QUESTION SECTION:
    *.imnonline.net. IN A

    ANSWER SECTION:
    *.imnonline.net. 1800 IN A 192.168.2.13


    In TCP/IP Properties, Advanced> DNS tab, clear the check box for "Append
    parent suffixes of the Primary DNS suffix"

    Nslookup ignores this check box and will append the parent suffixes anyway,
    you can configure your own DNS suffix search list by selecting "Append these
    suffixes (in order)" then enter corp.imnonline.net as the only DNS suffix to
    append.

    Assuming this is an AD Domain and your clients are all Windows XP, you can
    make this setting on the Default Domain Group Policy, here:

    Computer Configuration
    -Administrative templates
    -Network
    -DNS Client
    DNS Suffix search list

    Run gpupdate from a cmd prompt.

    This policy will not apply to Win2k, you have to use the setting in TCP/IP
    properties.

    But you can apply the policy from a Win2k DC, if you upgrade the GPOs from
    an XP Client.
    Upgrading Windows 2000 Group Policy for Windows XP:
    http://support.microsoft.com/kb/307900/en-us


    --
    Best regards,
    Kevin D. Goodknecht Sr. [MVP]
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    Kevin D. Goodknecht Sr. [MVP], Jan 18, 2007
    #2
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