dhcp clients & new dhcp server

Discussion in 'Server Networking' started by Espowari, Sep 18, 2004.

  1. Espowari

    Espowari Guest

    We're moving our dhcp service off of an NT4 box, onto a 2k or 2k3 server.
    I understand how to migrate the data, but have a question about the client
    side of the house.
    How will our 2K and XP dhcp clients weather the storm? One suggestion was to
    turn off all the client PCs, migrate the server and then turn the clients
    back on.
    This seems a little excessive, as there are over 700 machines in our office.
    It seems to me that clients will have their address and when they send out
    the dhcp request, they will be granted the same IP. DHCP is smart enough to
    understand what IP's are already in use and this is a non issue.

    Thoughts and suggestions appreciated
    Espowari, Sep 18, 2004
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  2. The default lease is for 7 or 8 days. Reduce the lease interval to 1 hour
    on the NT4 DHCP server, one week in advance of shutting it down. By the
    time you take the NT4 server off-line they clients will be renewing every 1
    hour and will make the transition to the new DHCP server within an hour of
    shutting down the old.
    Steve Bruce, mct, Sep 18, 2004
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  3. Espowari

    Espowari Guest

    Thanks Steve.

    One further question: I am unsure if we'll be changing the IP address of the
    new DHCP server to match the NT4 machine that we're bringing down. While that
    would be ideal for the clients to hit the same machine, if it is a different
    IP, DHCP requests will go out to a non-existent address, get no reply, and
    then broadcast for a DHCP ack - the new server will then complete the DORA
    process and clients will be properly addressed.

    This isn't really a question I know, but just wanted to bounce this idea off


    Espowari, Sep 19, 2004
  4. Steve's reply is the best solution.

    To answer you second question, DHCP requests are made by a discover
    broadcast. You don't configure them to point to a specific server. As long
    as the new DHCP server is on the same subnet, your clients won't have a
    problem getting a new IP address.
    Rob Elder MVP-Networking, Sep 19, 2004
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