How to force clients to renegotiate DHCP?

Discussion in 'Cisco' started by AM, Jan 4, 2006.

  1. AM

    AM Guest

    Hi all,

    does the command "clear ip dhcp bindings *" force the clients to renegotiate the IP address? Or will the client do that
    only at the dateline fixed by the previuos negotiation?

    Alex
     
    AM, Jan 4, 2006
    #1
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  2. Depends on the client.
    On windows:
    ipconfig /renew
    On SUN:
    ifconfig dhcp extend

    on others:
    see the manual pages

    :)

    Your command will clear the binding on the dhcp-server only, there's no
    mechanism to inform the clients about that fact

    Mathias
    AM schrieb:
    > Hi all,
    >
    > does the command "clear ip dhcp bindings *" force the clients to
    > renegotiate the IP address? Or will the client do that only at the
    > dateline fixed by the previuos negotiation?
    >
    > Alex
     
    Mathias Gaertner, Jan 5, 2006
    #2
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  3. Alex,

    No and Yes.

    Clients cannot be forced to renegotiate their IP address.
    If you need to have your clients renegotiate their IP address, lower the
    lease-duration in advance and then change your DHCP setup. Wait for all
    hosts to have leases with this new lease-duration before you change the DHCP
    setup.
    Only do this if you have a small enough network for the router to cope with
    the additional DHCP traffic when the lease is shortened. Use a
    lease-duration of 30 minutes to have hosts acknowledge the change within 30
    minutes after the DHCP setup change. When the change has been executed,
    raise the lease-duration again to acceptable levels.

    So this requires planning!

    Erik

    "AM" <> wrote in message
    news:Y5Vuf.111894$...
    > Hi all,
    >
    > does the command "clear ip dhcp bindings *" force the clients to
    > renegotiate the IP address? Or will the client do that only at the
    > dateline fixed by the previuos negotiation?
    >
    > Alex
     
    Erik Tamminga, Jan 7, 2006
    #3
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