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This is a useful function especially on a sensitive network where only certain people are allowed access. Not only will other IP addresses be excluded, but even the allowed visitor can access only certain directories. If you are only running 2 machines in a peer to peer network or your network is secured behind a firewall and you only need WebServUSB to function as an Intranet server, then you likely wouldn't use this feature. To use IP Security the "Enable Address Security" box needs to be checked. You can then enter a URL and the IP Address that is allowed to access that specific URL. Let's say I have a small network of 3 computers. Using the MS addressing they are: 165.254.203.1, 165.254.203.2 and 165.254.203.3
WebServUSB is on 165.254.203.1 Then, when I go to the computer addressed as 165.254.203.2 and browse to 165.254.203.1 everything will work as normal. However, if I go to the machine addressed as 165.254.203.3 and try to browse 165.254.203.1 then I will not be allowed to access it. I will get an error message instead. This can be refined to a specific directory as well. On my site I have a folder named "secure". If I set enable security on the /secure/ folder and give it an address of 165.254.203.2, then only 165.254.203.2 can access it. 165.254.203.3 can see everything else but that. This will apply to any other directories below /secure/ also. The IP address can also be a wildcard match. So if I set 165.254.203.*, then all computers with that address can access the area. This helps on a larger network where a department with several computers needs access to a certain area and nobody else does. You will need to plan your network carefully so that the IP Addresses of computers in specific physical locations are relative to the server directories requiring access.
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