Can I change scope's EndIP and Subnet without losing leases?

I have a network that has grown beyond expectations and I'm running out of IP
space.

I have a single scope defined in my DHCP server:
192.168.168.26 to 192.168.168.254 with a subnet of 255.255.255.0

I need to add new clients without disrupting the operations of the 200+
clients I already have.

Can I just change the EndIP and subnet, or will this disrupt my network?

If I can't do that, can I just add another scope?
Any other ideas?

I need to make more IP space for the same network without causing exising
connections to fail.

Thank you.
DRW

Answering at least part of my own question.... looks like I can't change the
subnet mask anyway (field is disabled), so the answer to my first question is
"no".
right?

And if I were to change the EndIP without changing the subnet, this means
that any host that is issued 192.168.169.1, for example, would be confused
with whatever host has 192.168.168.1, because the left-most 24 bits will all
appear as though they are part of the network address, not the host address,
with the 255.255.255.0 subnet mask..... which wouldn't be good.
(please correct my above "statement" (was more of a question, really) if
I've misunderstood how this stuff works....)

So from reading other threads, it appears as though my best (only?) option
is to delete my existing scope and create a new one.
Say: 192.168.168.26 to 192.168.171.254 with a subnet of: 255.255.248.0

If I'm on the right track, then my next question would be:
How can I do this with minimal impact? When I delete the existing scope,
then recreate the new one, what do I need to do with all of my existing hosts
that have leases?
Should they be rebooted? Or run ipconfig /renew? Or is there a way they can
continue operating and get the new leases automatically, with the new subnet?

I have a few servers in the reserved space at 192.168.168.1-26 that have
static IP and subnet that need to communicate with all of these clients that
have the DHCP leases...(but it's the clients that are initiating the
connections).

Any expert help or advice is greatly appreciated...
Thanks,
DRW


"DRW" wrote:

> I have a network that has grown beyond expectations and I'm running out of IP
> space.
>
> I have a single scope defined in my DHCP server:
> 192.168.168.26 to 192.168.168.254 with a subnet of 255.255.255.0
>
> I need to add new clients without disrupting the operations of the 200+
> clients I already have.
>
> Can I just change the EndIP and subnet, or will this disrupt my network?
>
> If I can't do that, can I just add another scope?
> Any other ideas?
>
> I need to make more IP space for the same network without causing exising
> connections to fail.
>
> Thank you.
> DRW

You can change it by reducing the lease period, then making the change at a
quiet time.
You should also consider adding VLANs to your network.
Anthony
http://www.airdesk.co.uk



"DRW" <(E-Mail Removed)> wrote in message
news:ABEEEA4F-A424-4E7E-BA59-(E-Mail Removed)...
> Answering at least part of my own question.... looks like I can't change
> the
> subnet mask anyway (field is disabled), so the answer to my first question
> is
> "no".
> right?
>
> And if I were to change the EndIP without changing the subnet, this means
> that any host that is issued 192.168.169.1, for example, would be confused
> with whatever host has 192.168.168.1, because the left-most 24 bits will
> all
> appear as though they are part of the network address, not the host
> address,
> with the 255.255.255.0 subnet mask..... which wouldn't be good.
> (please correct my above "statement" (was more of a question, really) if
> I've misunderstood how this stuff works....)
>
> So from reading other threads, it appears as though my best (only?) option
> is to delete my existing scope and create a new one.
> Say: 192.168.168.26 to 192.168.171.254 with a subnet of: 255.255.248.0
>
> If I'm on the right track, then my next question would be:
> How can I do this with minimal impact? When I delete the existing scope,
> then recreate the new one, what do I need to do with all of my existing
> hosts
> that have leases?
> Should they be rebooted? Or run ipconfig /renew? Or is there a way they
> can
> continue operating and get the new leases automatically, with the new
> subnet?
>
> I have a few servers in the reserved space at 192.168.168.1-26 that have
> static IP and subnet that need to communicate with all of these clients
> that
> have the DHCP leases...(but it's the clients that are initiating the
> connections).
>
> Any expert help or advice is greatly appreciated...
> Thanks,
> DRW
>
>
> "DRW" wrote:
>
>> I have a network that has grown beyond expectations and I'm running out
>> of IP
>> space.
>>
>> I have a single scope defined in my DHCP server:
>> 192.168.168.26 to 192.168.168.254 with a subnet of 255.255.255.0
>>
>> I need to add new clients without disrupting the operations of the 200+
>> clients I already have.
>>
>> Can I just change the EndIP and subnet, or will this disrupt my network?
>>
>> If I can't do that, can I just add another scope?
>> Any other ideas?
>>
>> I need to make more IP space for the same network without causing exising
>> connections to fail.
>>
>> Thank you.
>> DRW