This directory should contain three ipsets.  The contents of these sets
vary from site to site, so you must provide them yourself.

internal.set  - A set of IP addresses internal to your network
darkspace.set - A set of IP addresses that no activity should occur on.
                If you have a block of allocated addresses that are known
                to not be occupied, this would be an appropriate use.
                Otherwise, you might use addresses that are reserved
                by Internet standards.
blacklist.set - A set of IP addresses that none of your hosts should ever
                talk to.  This would include addresses of known "corrupt"
                sites.  (For example, sites that are known to be used
                for collecting illicit information.)
