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Using CIDR's on IIS

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7 replies

by sabatogz

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Using windows 2000 and running Internet Information services. We have a web site used for internal operations and we would like to make it available to another business. Under "Directory Security", "IP address and Domain Name Restrictions" I have selected "By Default, all computers will be" Denied Access except those listed.

My Question is how would you use a CIDR in this dialog box? Example x.x.x.x/25

7 replies

by ayoshi

The CIDR is basically a replacement for the netmask.

Putting the netmask equivalent of /25 into binary, we get:
11111111.11111111.11111111.10000000

The /25 defines the first 25 bits of the ip address as the network, which translates to 255.255.255.128.

Thus, depending on the equipment you are using you will use either the netmask or the CIDR, not both.

Good luck.

by ayoshi

Also, to answer your question directly, no, you would not need to add the /25. :)

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