DHCP and changing subnets

Our office is currently almost out of addresses on our current subnet and I
am planning on making a subnet change to add another 255 available
addresses. Aside reconfiguring all of the devices on the network to
accomodate the new subnet, what needs to be done to DHCP? Can I keep my
current scope and just create a new scope for the new range or do I need to
completely blow out all of the scopes and reservations and recreate them. I
was looking at the Superscope, but didn't know if that would apply to this
situation.

Thanks!

Assuming you are adding a Router and a new Segment with the Router sitting
between the "old" and "new" Segments,....

Yes, you just add another new Normal Scope

No,...no superscopes!

Set the Router between the segments to forward DHCP Queries to the DHCP
Server. The DHCP Server is smart enought to know what to do with it from
there.

--
Phillip Windell [MCP, MVP, CCNA]
www.wandtv.com


"Rockn" <(E-Mail Removed)> wrote in message
news:%(E-Mail Removed)...
> Our office is currently almost out of addresses on our current subnet and
> I am planning on making a subnet change to add another 255 available
> addresses. Aside reconfiguring all of the devices on the network to
> accomodate the new subnet, what needs to be done to DHCP? Can I keep my
> current scope and just create a new scope for the new range or do I need
> to completely blow out all of the scopes and reservations and recreate
> them. I was looking at the Superscope, but didn't know if that would apply
> to this situation.
>
> Thanks!
>

Actually I misspoke. I am not adding another subnet just adding more IP
addresses to the current subnet by changing the mask to 255.255.254.0
instead of 255.255.255.0

Thanks again.

"Phillip Windell" <@.> wrote in message
news:OJ%(E-Mail Removed)...
> Assuming you are adding a Router and a new Segment with the Router sitting
> between the "old" and "new" Segments,....
>
> Yes, you just add another new Normal Scope
>
> No,...no superscopes!
>
> Set the Router between the segments to forward DHCP Queries to the DHCP
> Server. The DHCP Server is smart enought to know what to do with it from
> there.
>
> --
> Phillip Windell [MCP, MVP, CCNA]
> www.wandtv.com
>
>
> "Rockn" <(E-Mail Removed)> wrote in message
> news:%(E-Mail Removed)...
>> Our office is currently almost out of addresses on our current subnet and
>> I am planning on making a subnet change to add another 255 available
>> addresses. Aside reconfiguring all of the devices on the network to
>> accomodate the new subnet, what needs to be done to DHCP? Can I keep my
>> current scope and just create a new scope for the new range or do I need
>> to completely blow out all of the scopes and reservations and recreate
>> them. I was looking at the Superscope, but didn't know if that would
>> apply to this situation.
>>
>> Thanks!
>>
>
>

In news:uHCJH$(E-Mail Removed),
Rockn <(E-Mail Removed)> stated, which I commented on below:
> Actually I misspoke. I am not adding another subnet just adding more
> IP addresses to the current subnet by changing the mask to
> 255.255.254.0 instead of 255.255.255.0
>
> Thanks again.

Unfortuantely you will need to delete the scope and recreate it with the new
subnet. Document what you currently have, meaning reservations, exclusions,
etc, and apply it to the new scope.

--
Ace
Innovative IT Concepts, Inc
Willow Grove, PA

This posting is provided "AS-IS" with no warranties or guarantees and
confers no rights.

Ace Fekay, MCSE 2003 & 2000, MCSA 2003 & 2000, MCSE+I, MCT, MVP
Microsoft MVP - Directory Services
Microsoft Certified Trainer

Having difficulty reading or finding responses to your post?
Instead of the website you're using, I suggest to use OEx (Outlook Express
or any other newsreader), and configure a news account, pointing to
news.microsoft.com. This is a direct link to the Microsoft Public
Newsgroups. It is FREE and requires NO ISP's Usenet account. OEx allows you
to easily find, track threads, cross-post, sort by date, poster's name,
watched threads or subject.
It's easy:

How to Configure OEx for Internet News
http://support.microsoft.com/?id=171164

Infinite Diversities in Infinite Combinations
Assimilation Imminent. Resistance is Futile
"Very funny Scotty. Now, beam down my clothes."

The only constant in life is change...

Then my answer is "No, don't do that" and add a new segment with a router
between them. Keep segments below 250-300 Hosts. The 24bit mask does that
perfectly,...keep it like that.

--
Phillip Windell [MCP, MVP, CCNA]
www.wandtv.com



"Rockn" <(E-Mail Removed)> wrote in message
news:uHCJH$(E-Mail Removed)...
> Actually I misspoke. I am not adding another subnet just adding more IP
> addresses to the current subnet by changing the mask to 255.255.254.0
> instead of 255.255.255.0
>
> Thanks again.
>
> "Phillip Windell" <@.> wrote in message
> news:OJ%(E-Mail Removed)...
>> Assuming you are adding a Router and a new Segment with the Router
>> sitting between the "old" and "new" Segments,....
>>
>> Yes, you just add another new Normal Scope
>>
>> No,...no superscopes!
>>
>> Set the Router between the segments to forward DHCP Queries to the DHCP
>> Server. The DHCP Server is smart enought to know what to do with it from
>> there.
>>
>> --
>> Phillip Windell [MCP, MVP, CCNA]
>> www.wandtv.com
>>
>>
>> "Rockn" <(E-Mail Removed)> wrote in message
>> news:%(E-Mail Removed)...
>>> Our office is currently almost out of addresses on our current subnet
>>> and I am planning on making a subnet change to add another 255 available
>>> addresses. Aside reconfiguring all of the devices on the network to
>>> accomodate the new subnet, what needs to be done to DHCP? Can I keep my
>>> current scope and just create a new scope for the new range or do I need
>>> to completely blow out all of the scopes and reservations and recreate
>>> them. I was looking at the Superscope, but didn't know if that would
>>> apply to this situation.
>>>
>>> Thanks!
>>>
>>
>>
>
>