In Linux®, you may have looked at
/proc/sys/net/ipv4/ip_forward
to determine if
IP forwarding was enabled. Under FreeBSD you should use sysctl(8) to
view this and other system settings, as procfs(5) has been
deprecated in current versions of FreeBSD. (Although
sysctl
is available in Linux® as well.)
In the IP forwarding example, you would use the following to determine if IP forwarding is enabled on your FreeBSD system:
%
sysctl net.inet.ip.forwarding
net.inet.ip.forwarding: 0
The -a
flag is used to list all the system
settings:
%
sysctl -a
kern.ostype: FreeBSD kern.osrelease: 6.2-RELEASE-p9 kern.osrevision: 199506 kern.version: FreeBSD 6.2-RELEASE-p9 #0: Thu Nov 29 04:07:33 UTC 2007 root@i386-builder.daemonology.net:/usr/obj/usr/src/sys/GENERIC kern.maxvnodes: 17517 kern.maxproc: 1988 kern.maxfiles: 3976 kern.argmax: 262144 kern.securelevel: -1 kern.hostname: server1 kern.hostid: 0 kern.clockrate: { hz = 1000, tick = 1000, profhz = 666, stathz = 133 } kern.posix1version: 200112 ...
Some of these sysctl
values are
read-only.
There are occasions where procfs is required, such as running
older software, using truss(1) to trace system calls, and
Linux® Binary Compatibility.
(Although, Linux® Binary Compatibility uses its own procfs, linprocfs(5).)
If you need to mount procfs you can add the following to
/etc/fstab
:
proc /proc procfs rw,noauto 0 0
noauto
will prevent
/proc
from being automatically mounted at
boot.
And then mount procfs with:
#
mount /proc
All FreeBSD documents are available for download at http://ftp.FreeBSD.org/pub/FreeBSD/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>.