Creating a 9bit Class C subnet

I am thinking about changing my companies subnet from 255.255.255.0 to 255.255.254.0 open up more available DHCP IP Addreses. the current subnet is 192.168.10.1 through 192.168.10.100 reserved for Static and 192.168.10.101 through 192.168.10.254 both with 255.255.255.0 for the subnet. My question is, can I simply go into the Server 2008 DHCP server scope options and change the DHCP subnet setting to .254 specifically only for the DHCP clients? Or will I have to do both that AND chance all of my server,SAN,networking devices, etc network adapter settings to 255.255.254.0 as well in order for the DHCP clients and servers to still be able to communicate?

thanks
braineater13Asked:
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zulazenCommented:
In your LAN, your subnet/subnet mask will need to be the same for any devices that need to directly communicate without the use of a router.   So yes you would need to change this subnet mask in your DHCP scope and any static clients that reside on that network.

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Share-ITCommented:
As zulazen stated - you will need to update all devices.

to assist in changing the DHCP assigned submet masks, change the lease time to an hour and leave for a week or so. That way all dhcp clients will update within half an hour of you changing the subnets and save you running around

 
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braineater13Author Commented:
Ok, one thing I'm still not sure I understand is what to do about the third octate, 255.255.?.X. For each static IP I currently have on each machine that is 192.168.10.x, what do I need to make the third octate? Or will i even need to change that? Just leave the Statics IPs all 192.168.10.x? And just change the DHCP scope to start at 192.168.10.100 and end at 192.168.11?.254? or does it matter what I make the third octate in the end of the scope, meaning could I theroetically make whatever I want?

thanks
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Share-ITCommented:
Subnet mask for ALL devices will need to be the same - 255.255.254.0.

Failure to do this would mean that any devices that are left with 255.255.255.0 on the 192.168.10.0 network would send all traffic destined for the 192.168.11.0 network to your default gateway.

The subnet mask is basically what defines if a particular network is local or on the other side of the router.
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Qlemo"Batchelor", Developer and EE Topic AdvisorCommented:
This question has been classified as abandoned and is closed as part of the Cleanup Program. See the recommendation for more details.
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Windows Server 2008

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