[Ext] Re: moving subnet to another server

Jim Glassford jmglass at iup.edu
Fri Jan 9 19:31:39 UTC 2015


There was similar query not to long ago on the list but I will be darned 
if I can find it. I seem to remember step by step instructions on 
completing a move to a new server, maybe I was dreaming.  :-(
This was as close as I found which may be helpful, move the leases file 
to the new server and verify if version differences.



On 1/9/2015 2:12 PM, Dana Huggard wrote:
> 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 nex-tech.com 
> <mailto:ptrapp at nex-tech.com>> 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 lists.isc.org
>     <mailto:dhcp-users-bounces at lists.isc.org>
>     [dhcp-users-bounces at lists.isc.org
>     <mailto:dhcp-users-bounces at lists.isc.org>] on behalf of Dana
>     Huggard [dana.huggard at cohodata.com <mailto:dana.huggard at cohodata.com>]
>     *Sent:* Friday, January 09, 2015 12:33 PM
>     *To:* dhcp-users at lists.isc.org <mailto:dhcp-users at lists.isc.org>
>     *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.
>     _______________________________________________
>     dhcp-users mailing list
>     dhcp-users at lists.isc.org <mailto:dhcp-users at lists.isc.org>
>     https://lists.isc.org/mailman/listinfo/dhcp-users
> -- 
> Dana Huggard
> System Administrator
> 778.724.0761 ext 117
> dana.huggard at cohodata.com <mailto:dana.huggard at cohodata.com>
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