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-rw-r--r--sbin/ipfw/ipfw.815
1 files changed, 14 insertions, 1 deletions
diff --git a/sbin/ipfw/ipfw.8 b/sbin/ipfw/ipfw.8
index 6c053da..3f4bc9a 100644
--- a/sbin/ipfw/ipfw.8
+++ b/sbin/ipfw/ipfw.8
@@ -1,7 +1,7 @@
.\"
.\" $FreeBSD$
.\"
-.Dd October 22, 2004
+.Dd February 22, 2005
.Dt IPFW 8
.Os
.Sh NAME
@@ -672,6 +672,19 @@ This makes the
.Xr netstat 1
entry look rather weird but is intended for
use with transparent proxy servers.
+.Pp
+To enable
+.Cm fwd
+a custom kernel needs to be compiled with the option
+.Cd "options IPFIREWALL_FORWARD" .
+With the additional option
+.Cd "options IPFIREWALL_FORWARD_EXTENDED"
+all safeguards are removed and it also makes it possible to redirect
+packets destined to locally configured IP addresses.
+Please note that such rules apply to locally generated packets as
+well and great care is required to ensure proper behaviour for
+automatically generated packets like ICMP message size exceeded
+and others.
.It Cm pipe Ar pipe_nr
Pass packet to a
.Xr dummynet 4
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