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Adding IPs to a shrinking network (Supernetting?)

Posted on 2014-10-23
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Last Modified: 2014-10-23
OK So I currently have a network running windows server 2003 with the following network config

Class C network
IP Range: 192.168.18.1 - 192.168.18.254
Subnet: 255.255.255.0

We have about 5-10 IPs free. I need to add more IP's to the network but not sure about how to go about it..

I looked at supernetting but am not sure how to set this up..  Is it possible to just change the current network config?

Any suggestions would be very much appreciated..  

Thank you!
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Question by:Herb Vasquez
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by:Wylie Bayes
ID: 40400307
What is your infrastructure like?  Switches? Layer 2 or Layer 3?
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by:Herb Vasquez
ID: 40400329
I have a 2 domain controllers handling 2 different scopes (192.168.18.40 - 192.168.18.120) (192.168.18.121 - 192.168.18.200)
all other IP are static.. Layer 2 switches with a sonicwall.. there are no VLAN being used..
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Wylie Bayes earned 500 total points
ID: 40400343
How many clients in total?  

What is the subnet mask on the domain controllers?  255.255.255.0 ?

Could change to 255.255.254.0, and double your IP's.  192.168.18.1-192.168.19.254.

Or to 255.255.252.0 and quadruple your IPs.

Obviously you will need to reconfigure / add additional scopes in DHCP once you decide / make this change.
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by:Herb Vasquez
ID: 40400387
we are almost full so about 220 clients in total, but we are adding about 25 new emlployees so we will def be out of IP with all the network printers and switches we will be adding
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by:Herb Vasquez
ID: 40400392
yes the subet for the DC is 255.255.255.0...


If i change the subnet mask to 255.255.252.0 whats the scope of IP's will to assign the scopes?

ex: scope 1 - 192.168.16.1 - 192.168.16.255
scope 2 192.168.18.17.0 - 192.168.17.255
scope 3 192.168.18.0 - 192.168.18.255

does that look right?
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by:Wylie Bayes
ID: 40400400
scope 1 - 192.168.16.1 - 192.168.16.255
scope 2 - 192.168.17.0 - 192.168.17.255
scope 3 - 192.168.18.0 - 192.168.18.255
scope 4 - 192.168.19.0 - 192.168.18.255

For a total of 1022 Host addresses.
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by:Wylie Bayes
ID: 40400402
scope 1 - 192.168.16.1 - 192.168.16.254 (Adjusted 255 to 254)
scope 2 - 192.168.17.0 - 192.168.17.255
scope 3 - 192.168.18.0 - 192.168.18.255
scope 4 - 192.168.19.0 - 192.168.19.254 (Adjusted 255 to 254)
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by:Herb Vasquez
ID: 40400410
now if the gateway (sonicwall) is on the 192.168.18.0 scope will the devices on the other scopes be able to communicate/use that gateway and servers that are not within their IP scope?
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by:Wylie Bayes
ID: 40400424
The sonic wall would also need to be configured for the new subnet mask.  Since you are going have to make those changes, it would be wise to probably re-ip the sonic wall to 192.168.16.1 .  Then all scopes would use 16.1 as their default gateway.

If you wish you leave it as 192.168.18.something  you would need to configure DHCP scopes (003 router option) to set the default gateway to the correct IP address.  18.something.
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by:Herb Vasquez
ID: 40400429
ok thank you for all the help!!
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by:Wylie Bayes
ID: 40400439
Most welcome :)
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