moving subnet to another server

Dana Huggard dana.huggard at
Fri Jan 9 19:12:33 UTC 2015

Thanks Patrick.   I don't know how to handle that. Not sure how smart dhcp
is to detect such a condition or how long it would take for things to sort
itself out.
The default-lease-time in the subnet declaration is 600.   Is there a
preferred way to handle this?

On Fri, Jan 9, 2015 at 10:59 AM, Patrick Trapp <ptrapp at> wrote:

>  How are you planning to prevent the new server from handing out
> addresses already assigned by the old server?
>  ------------------------------
> *From:* dhcp-users-bounces at [dhcp-users-bounces at]
> on behalf of Dana Huggard [dana.huggard at]
> *Sent:* Friday, January 09, 2015 12:33 PM
> *To:* dhcp-users at
> *Subject:* moving subnet to another server
>   Hi.
>  I'm planning on moving a subnet over to another server and am not sure
> what kind of devil hides in the details.
>  The subnet is 10.x.x.0/18 and it is very busy. Its a subnet devoted to a
> test harness of servers that go up and down a lot putting a big load on
> dhcpd and named (using ddns).
>  Along with the dhcpd change the new dhcp server will also serve as a dns
> server for a new domain.
>  To implement the move I have a new dhcp server I plan to remove the
> subnet declaration from dhcpd.conf off the old server, add it to the new
> server, then restart dhcpd on the old server, and start dhcpd on the new
> server.
>  What I am wondering about is what to expect for the behaviour of the
> dhcp clients. How disruptive might this be?
>  Thank you.
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> dhcp-users mailing list
> dhcp-users at

Dana Huggard
System Administrator
778.724.0761 ext 117
dana.huggard at
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