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How to force clients to renegotiate DHCP?

 
 
AM
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      01-04-2006
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
 
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Mathias Gaertner
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      01-05-2006
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

 
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Erik Tamminga
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      01-07-2006
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" <(E-Mail Removed)> wrote in message
news:Y5Vuf.111894$(E-Mail Removed)...
> 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



 
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