I think that blackhole sysctl is FreeBSD specified. What sysctl inderpended on BSD distro???

Since this book is for beginning admins, let's focus on just using some common sysctls -- common over all the BSDs, such as:

• kern.securelevel and point to other wiki page for details
• net.inet.ip.forwarding and point to other wiki page for details
• hw.machine_arch
• kern.version
• etc ...

--reed

Ok I'll do this -- Alex