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Should a 100.0.0.0 or 100.x.x.x network be used internally?  Are there risks?

Posted on 2008-10-02
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Last Modified: 2011-01-06
Is it a good practice to use a 100.x.x.x network internally?  Is the 100.x.x.x network routable?
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Question by:abcam
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by:Tolomir
ID: 22622737
Yes it is routeable so you should use 10.x.x.x instead.

Tolomir
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Tolomir earned 500 total points
ID: 22622745
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Expert Comment

by:jtdebeer
ID: 22622793
For private IP Range always evaluate the amount of nodes / clients you would like to accomodate on each subnet.

Class A would give you maximum nodes per subnet
Private Range 10.0.0.1 - 10.255.255.254

Class B good mixture
Private Range 127.16.0.1 - 172.31.255.254

Class C - 254 hosts with a vast amount of subnets
254 Nodes per subnet ( 255 subnets)
Private Range 192.168.0.0 - 192.168.255.254
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Author Closing Comment

by:abcam
ID: 31502313
Thanks
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by:Tom-J-Lael
ID: 34485948
Oddly enough, I have a client who has a 100.0.50.0/24 internal network set up. I just discovered that today. Whoever set them up originally obviously was not the right person to be setting their network up.

It hasn't been a problem yet that I know of for them, but hypothetically if there was a website at each ip address in the 100.0.0.0/8 range, they would not be able to reach them. That's hypothetically 16,777,214 websites they wouldn't be able to reach.
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Expert Comment

by:Tolomir
ID: 34488115
Thanks for sharing. Yes you are right, I get the same issues when "playing" with vmware  server / player. Masking parts of our internal 192.168.x.x. subnet. So I always reconfigure vmware to use 10.  subnets
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