dns/dhcp odd issue with 2003 server.. dns entry not being updated

Discussion in 'Server Networking' started by markm75, Dec 13, 2007.

  1. markm75

    markm75 Guest

    I have 2 DHCP servers.. each with the same address scope, but exclusions set
    on each one to make them seperate... I also have 3 DNS servers as of now
    (soon to become 1)..

    In DHCP I have the DNS servers ip addresses set in the scope so end users
    get dns working ok...

    i've also set the option in dhcp under the main server properties..
    Advanced.. "Dns dynamic updates registration credentials" button..

    To a "domain user" (non admin) in the domain.. (is this correct to do)?

    Here is the problem..

    DNS wise.. i have a machine that when you ping it.. shows up with the wrong
    ip address ( and obviously doesnt ping.. (the correct ip
    should be xxx.24)...

    In DHCP serverA.. i see an entry for this workstation (wkst50).. .. this is the ip is wrong obviously
    In DHCP serverB.. I see an entry for this workstation (wrkst50).. .. this is the CORRECT ip address..

    So it would seem it has 2 different entries in DHCP.. not sure if this part
    is an issue or not..

    But then in the dns tree.. for A records.. it of course has the entry of

    I'm not sure why this isnt updating in DNS from that workstation.. is it the
    DHCP user account for credentials i've set (not enough rights)?

    I also looked in reverse lookup domain.. i see 4 entries for this same
    workstation (.24, .37, .115, .189), not sure if this matters either..

    Thanks for any help..
    markm75, Dec 13, 2007
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  2. markm75

    SeriousSam Guest

    My friend, it sounds like you have a bit of a mess. Im curious what prompted
    the setup you have, rather than creating a single range, or creating two
    seperate scopes. In my opinion, that is what you should do. Would you mind
    sharing the reasoning behind that set up? Im very curious! Thanks!

    SeriousSam, Dec 14, 2007
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  3. markm75

    markm75 Guest

    According to what i have read, unless i've read incorrectly.. the correct
    way to setup DHCP, is to use an 80/20 rule or a 50/50, if using two servers..
    to set a scope on each server with the same range, however, you setup
    exclusions which essentially create two different ranges on each server,
    preventing any issues..

    I believe the issue i had was simply a dns hiccup, or lack of scavenging of
    stale records (i had never turned on)..

    I had the affected workstation issue the /flushdns and then /registerdns,
    after i deleted the errant A record and everything was fine.
    markm75, Dec 15, 2007
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