AW: Migrating from a Cisco Routers DHCP to ISC DHCP

Zemke, Kai Kai.Zemke at
Tue Oct 20 08:33:49 UTC 2009

No I can't remember that I ever encountered a problem like this. On our network the ips are leased correctly and a lot of clients are getting the same address over and over again. There are also only about two or three infinite leases in my table.

Von: dhcp-users-bounces at [mailto:dhcp-users-bounces at] Im Auftrag von Vineesh Viswanath Iyer
Gesendet: Montag, 19. Oktober 2009 20:07
An: Users of ISC DHCP
Betreff: Re: Migrating from a Cisco Routers DHCP to ISC DHCP

hi Zemke , i have got dhcp service running on my cisco 3845 , got a strange problem , despite the lease being infinite , the router leases a new ip on every reboot, have you had this problem on your network ?


On Mon, Oct 19, 2009 at 11:31 AM, Zemke, Kai <Kai.Zemke at<mailto:Kai.Zemke at>> wrote:
Hi everyone,

we are planing to migrate a relatively large dhcp network from a dhcp service on a cisco router to isc dhcp.
I'd like to know if anyone already went through such process and can point me to some tricky things I have to think about.
One thing I'm thinking of is the question: is there a way to keep the old ip dhcp binding table from the cisco router? And maybe copy it to the isc dhcp server?
Or what ways are pefered to make all clients get a new ip address on the new server. So that there are no adresses on the net twice because the lease hasn't expired yet
but the server offered this ip to a new client because he just wasn't aware of an old lease.

Thanks for your help

With kind regards
Kai Zemke

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