Audience I’m assuming that readers have at least a basic knowledge of TCP/IP networking and some UNIX or UNIX-like systems, but not necessarily OpenBSD or FreeBSD. This post will therefore be light on details that aren’t OS specific and are likely to be encountered in normal use (e.g., how to use vi or another text editor.) For more information on these topics, read Absolute FreeBSD (3ed.) by Michael W. Lucas.