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
How to force clients to renegotiate DHCP?
Jan 04, 2006
2 Replies
First reply
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
Read the full replyDepends 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:
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
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