Re: DHCP Migration

From: Joe (joedboswell)
Date: 06/03/04 

Date: Thu, 3 Jun 2004 14:48:48 -0700

I actually just thought of an answer, though I think something you said must
have triggered it...

Basically yes, the one catch to all this is I will be using my old
Addressess in the new scope, but since I am adding quite a few hundred more,
I will just make the 255 I have now not available for leasing for a few
weeks, until the records die and all the machines have new IPs, and then
just extend that scope out once everything is kosher again...

Thanks for the help!

Joe

"Phillip Windell" <@.> wrote in message
news:OMzDd3aSEHA.2716@tk2msftngp13.phx.gbl...
> You get the one configured the way you like but leave the scopes
> "deactivated". You would have a separate scope for each subnet. You
> Router(s) handling the subnets would be configured to forward DHCP request
> to the proper DHCP Server. When you are ready to active the scopes shut
down
> the old DHCP and keep it off the system, or at least disable the DHCP
> Service on it, then activate the scopes on the new one.
>
> If you are doing this with the same address set you currently use now it
> will be messy and I can't see any way to avoid some downtime. We did ours
> by using a whole new address block to do the splitting and left our old
> address block alone and used the old one for the first subnet. This
allowed
> me to keep everything running as it was in the "first" subnet (old address
> block) and move things a little at a time. Once the new scopes were
> configured and activated on the DHCP Server and the Router was forwarding
> the requests, I then took the machines in small groups and moved the patch
> cable to the proper switch port and rebooted the machine or just did an
> IPCONFIG "Release" and "Renew" and the machines were now in the new
subnet.
> Doing them in small groups reduced the effect of the "disaster" if it
didn't
> go well.
>
> You have to be careful with Servers because software running on them may
be
> tied to their IP# and the Servers may be referenced on other machines by
> thier IP#. Sometimes a software application running on a Server
practically
> "shoots itself in the head" if you change the Server's IP#, so there is a
> lot to consider when you move a Server to another subnet. You need to
> research the effects of IP# changes for every application running on the
> Server, and this may even be true for some applications on the Clients.
>
> --
>
> Phillip Windell [MCP, MVP, CCNA]
> www.wandtv.com
>
>
>
> "Joe" <joedboswell at hotmail dot com> wrote in message
> news:%23Ibpk3YSEHA.3944@tk2msftngp13.phx.gbl...
> > So we are installing a DHCP server on another machine in our domain with
> the
> > intention to have it be our primary DHCP server.
> >
> > At the same time we are resubnetting, going from 24 bit mask to 22 bit.
> >
> > I was wondering how to go about this? Basically just setup the DHCP
> server
> > on the new machine and then delete all the clients on the old machine
and
> > use the reconcile??? I have no idea, any help in the right direction
> would
> > be greatly appreciated!
> >
> > Joe
> >
> >
>
>

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