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DHCP Resubnetting

Posted on 2013-01-31
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Last Modified: 2013-02-01
Hello All,

I have a subnet that will be running out of ip addresses soon, because we are merging floors. I have read some post in here that state resubnetting is not a good idea, because of going over the 250-300 ip addresses per subnet create network latency (there are approx. 100-110 users, but it is ip phone and computer). Anywho here is my situation.... My subnet is 172.22.8.x/24. I have a core switch that has a few vlan's on it with subnets of there own; 172.22.5.x, 172.22.12.x, 172.22.24.x...etc all /24. If I resubnet the .8 network to a /23 will I have to change any of the other default gateways or just this one since they are all separate vlans? Also, if I choose to add another subnet to the .8 subnet will that affect any of the others. I assume I would have to delete and start a new one regarless of the way I proceed. Any suggestions as to the better method?
In addition to, I have other switches in the environment, would they need to be changed?
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Question by:DDCO
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Darr247 earned 500 total points
ID: 38840750
If you change the scope 172.22.8.0 /24 to 172.122.8.0 /23, its new IP range will be
172.22.8.0 - 172.22.9.255, with 172.22.8.1 through 172.22.9.254 as assignable IPs.

I don't see why you would need to change its default gateway, though.
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by:DDCO
ID: 38841014
Now it's gateway is 172.22.8.225. So as long as the gateway is in the allotted subnet it would not matter?
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by:Darr247
ID: 38842133
Not that I can see, no.  

There is a problem with CIDR being broken in older versions of windows, but that problem doesn't appear until you get smaller than /16 with a 172.16-32 subnet.
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