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Help! DNS or DHCP problems???

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  • Help! DNS or DHCP problems???

    Hello, this is my first post here

    I have the following dillema. The place I contract for is having DNS issues. DNS and DHCP are running on the 2003 AD server. They do not seem to notice them in their day to day operations. I have come across them using spiceworks to come up with an asset list. Unfortunately being a contractor I have no access to the server running DHCP and DNS.

    The following is typical of what happens. I will ping a pc by name and get the following:

    C:\>ping ws153

    Pinging ws153.ntd1.local [10.0.0.118] with 32 bytes of data:

    Reply from 10.0.0.118: bytes=32 time<1ms TTL=128
    Reply from 10.0.0.118: bytes=32 time<1ms TTL=128

    Then ping another workstation and get same IP address:

    C:\>ping ws248

    Pinging ws248.ntd1.local [10.0.0.118] with 32 bytes of data:

    Reply from 10.0.0.118: bytes=32 time<1ms TTL=128
    Reply from 10.0.0.118: bytes=32 time<1ms TTL=128

    Next I do an nbtstat on IP to see which it really is
    and find it's really ws248, not ws153

    C:\>nbtstat -A 10.0.0.118

    Local Area Connection:
    Node IpAddress: [10.0.0.116] Scope Id: []

    NetBIOS Remote Machine Name Table

    Name Type Status
    ---------------------------------------------
    WS248 <00> UNIQUE Registered
    NTD1 <00> GROUP Registered
    WS248 <20> UNIQUE Registered
    NTD1 <1E> GROUP Registered

    MAC Address = 00-21-9B-36-89-0C


    Wireless Network Connection 2:
    Node IpAddress: [0.0.0.0] Scope Id: []

    Host not found.

    If I do nslookup on both workstations I get the following:

    C:\>nslookup ws153
    Server: fs1.ntd1.local
    Address: 10.0.0.2

    Name: ws153.ntd1.local
    Address: 10.0.0.118


    C:\>nslookup ws248
    Server: fs1.ntd1.local
    Address: 10.0.0.2

    Name: ws248.ntd1.local
    Address: 10.0.0.118

    If I do nslookup on IP address I get the following:

    C:\>nslookup 10.0.0.118
    Server: fs1.ntd1.local
    Address: 10.0.0.2

    *** fs1.ntd1.local can't find 10.0.0.118: Non-existent domain

    This is happening to quite a few machines on the network. I should also add that they do have offsite users that vpn into the network and grab IP addresses from the same pool that everyone else does.

    This is really putting a glitch in trying to get an accurate asset list and it's driving me nuts.

    I need to show these people that this is a legitimate issue they need to address but they are not very keen on DNS and are afraid if I try to make changes to DNS that it might effect the users.

    My questions:

    Is this a DNS or DHCP problem?

    Looking at the errors in nslookup I am assuming reverse lookup is not set up correctly?

    What can I have them do to fix this?

    Sorry for the long post.

  • #2
    Re: Help! DNS or DHCP problems???

    DNS issue.
    Enable scavenging on the DNS server.
    Marcel
    Technical Consultant
    Netherlands
    http://www.phetios.com
    http://blog.nessus.nl

    MCITP(EA, SA), MCSA/E 2003:Security, CCNA, SNAF, DCUCI, CCSA/E/E+ (R60), VCP4/5, NCDA, NCIE - SAN, NCIE - BR, EMCPE
    "No matter how secure, there is always the human factor."

    "Enjoy life today, tomorrow may never come."
    "If you're going through hell, keep going. ~Winston Churchill"

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