Changing subnet mask Server 2003

Hope someone can help. I need to change the subnet mask on my lan in order to
have more IP address' available. I am running server 2003, active directory
and ISA. I only use static IP addressing, DHCP is not in place. The
configuration I am using is:

Internal Network Server NIC:
10.0.0.2
255.255.255.0

Which allows lan IP address' of 10.0.0.1 thru 10.0.0.250

I want to change the subnet mask to 255.255.254.0 , which will open up
10.0.1.1 thru 10.0.1.250 on the network for use. I would then have 10.0.0.1
Thru 10.0.1.250 range of IP address on the network correct?

I would change the above NIC in server 2003 machine subnet mask to
255.255.254.0 as well as all clients, switches, printers etc.

What else should I be aware of when doing this considering the use of active
directory, ISA and others?

Any help is greatly appreciated. Thanks.

Your host range is off a bit. I suggest you review this site before doing
anything. http://www.learntosubnet.com/

"Marine89-95" <Marine89-(E-Mail Removed)> wrote in message
news:936C712F-57DB-4788-9FD0-(E-Mail Removed)...
> Hope someone can help. I need to change the subnet mask on my lan in order
to
> have more IP address' available. I am running server 2003, active
directory
> and ISA. I only use static IP addressing, DHCP is not in place. The
> configuration I am using is:
>
> Internal Network Server NIC:
> 10.0.0.2
> 255.255.255.0
>
> Which allows lan IP address' of 10.0.0.1 thru 10.0.0.250
>
> I want to change the subnet mask to 255.255.254.0 , which will open up
> 10.0.1.1 thru 10.0.1.250 on the network for use. I would then have
10.0.0.1
> Thru 10.0.1.250 range of IP address on the network correct?
>
> I would change the above NIC in server 2003 machine subnet mask to
> 255.255.254.0 as well as all clients, switches, printers etc.
>
> What else should I be aware of when doing this considering the use of
active
> directory, ISA and others?
>
> Any help is greatly appreciated. Thanks.
>

"Marine89-95" <Marine89-(E-Mail Removed)> wrote in message
news:936C712F-57DB-4788-9FD0-(E-Mail Removed)...
> Hope someone can help. I need to change the subnet mask on my lan in order
> to
> have more IP address' available. I am running server 2003, active
> directory
> and ISA. I only use static IP addressing, DHCP is not in place. The
> configuration I am using is:
>
> Internal Network Server NIC:
> 10.0.0.2
> 255.255.255.0
>
> Which allows lan IP address' of 10.0.0.1 thru 10.0.0.250

That would be 10.0.0.1 thru 10.0.0.254

> I want to change the subnet mask to 255.255.254.0?

You could but I wouldn't. The LAN size should remain 254 host per segment.
Ethernet begins to lose efficiency when you get above that. Add another IP
segment and stay with 24bit masks.

Segment #1 - 10.0.0.0-10.0.0.255 255.255.255.0 (254 hosts)
Segment #2 - 10.0.1.0-10.0.1.255 255.255.255.0 (254 hosts)

(508 total hosts)

You will need a LAN Router and there will be some adjustment to the ISA.
The most economical LAN Router would be a Layer3 Switch, they are a hybrid,
a Switch and Router built into the same hardware.

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