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