In some Linux® distributions, one could look at
      /proc/sys/net/ipv4/ip_forward to determine
      if IP forwarding is enabled.  In FreeBSD,
      sysctl(8) is instead used to view this and other system
      settings.
For example, use the following to determine if IP forwarding is enabled on a FreeBSD system:
%sysctl net.inet.ip.forwardingnet.inet.ip.forwarding: 0
Use -a to list all the system
      settings:
%sysctl -a | more
If an application requires procfs, add the following entry
      to /etc/fstab:
proc /proc procfs rw,noauto 0 0
Including noauto will prevent
      /proc from being automatically mounted at
      boot.
To mount the file system without rebooting:
#mount /proc
All FreeBSD documents are available for download at https://download.freebsd.org/ftp/doc/
Questions that are not answered by the
    documentation may be
    sent to <freebsd-questions@FreeBSD.org>.
    Send questions about this document to <freebsd-doc@FreeBSD.org>.