LPRng Reference Manual: 3 May 2004 (For LPRng-3.8.27)
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# 17.5. Complex Permission Checking

One of the more useful types of permission checking is to restrict access to your printers from users outside your networks. The IP pattern can specify a list of IP addresses and netmasks to apply to them.

For example IP=10.3.4.0/24 would match all hosts with the IP addresses IP=10.3.4.0 to IP=10.3.4.255.

Similarly, the HOST pattern can specify a set of hostnames or patterns to match against based on the GLOB notation.

For example REMOTEHOST=*.private would match all hosts with a DNS entry which ended with `private`.

The NOT keyword reverses the match sense. For example REJECT NOT REMOTEHOST=*.private,*.murphy.com would reject all requests from hosts which did not have a DNS entry ending in `private` or `murphy.com`.

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