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Index: head/share/man/man4/ipfirewall.4
===================================================================
--- head/share/man/man4/ipfirewall.4
+++ head/share/man/man4/ipfirewall.4
@@ -1,7 +1,7 @@
.\"
.\" $FreeBSD$
.\"
-.Dd October 25, 2012
+.Dd May 21, 2020
.Dt IPFW 4
.Os
.Sh NAME
@@ -20,8 +20,14 @@
which may also be useful are:
.Bd -ragged -offset indent
.Cd "options IPFIREWALL_DEFAULT_TO_ACCEPT"
+.Cd "options IPDIVERT"
+.Cd "options IPFIREWALL_NAT"
+.Cd "options IPFIREWALL_NAT64"
+.Cd "options IPFIREWALL_NPTV6"
+.Cd "options IPFIREWALL_PMOD"
.Cd "options IPFIREWALL_VERBOSE"
.Cd "options IPFIREWALL_VERBOSE_LIMIT=100"
+.Cd "options LIBALIAS"
.Ed
.Pp
To load
@@ -57,6 +63,54 @@
behavior is to allow everything, it is easier to cope with
firewall-tuning mistakes which may accidentally block all traffic.
.Pp
+When using
+.Xr natd 8
+in conjunction with
+.Nm
+as
+.Tn NAT
+facility, the kernel option
+.Dv IPDIVERT
+enables diverting packets to
+.Xr natd 8
+for translation.
+.Pp
+When using the in-kernel
+.Tn NAT
+facility of
+.Nm ,
+the kernel option
+.Dv IPFIREWALL_NAT
+enables basic
+.Xr libalias 3
+functionality in the kernel.
+.Pp
+When using any of the
+.Tn IPv4
+to
+.Tn IPv6
+transition mechanisms in
+.Nm ,
+the kernel option
+.Dv IPFIREWALL_NAT64
+enables all of these
+.Tn NAT64
+methods in the kernel.
+.Pp
+When using the
+.Tn IPv6
+network prefix translation facility of
+.Nm ,
+the kernel option
+.Dv IPFIREWALL_NPTV6
+enables this functionality in the kernel.
+.Pp
+When using the packet modification facility of
+.Nm ,
+the kernel option
+.Dv IPFIREWALL_PMOD
+enables this functionality in the kernel.
+.Pp
To enable logging of packets passing through
.Nm ,
enable the
@@ -70,20 +124,39 @@
This option may be set to the number of packets which will be logged on
a per-entry basis before the entry is rate-limited.
.Pp
+When using the in-kernel
+.Tn NAT
+facility of
+.Nm ,
+the kernel option
+.Dv LIBALIAS
+enables full
+.Xr libalias 3
+functionality in the kernel.
+Full functionality refers to included support for cuseeme, ftp, bbt,
+skinny, irc, pptp and smedia packets, which are missing in the basic
+.Xr libalias 3
+functionality accomplished with the
+.Dv IPFIREWALL_NAT
+kernel option.
+.Pp
The user interface for
.Nm
is implemented by the
.Xr ipfw 8
utility, so please refer to the
.Xr ipfw 8
-manpage for a complete description of the
+man page for a complete description of the
.Nm
capabilities and how to use it.
.Sh SEE ALSO
.Xr setsockopt 2 ,
.Xr divert 4 ,
.Xr ip 4 ,
+.Xr ip6 4 ,
.Xr ipfw 8 ,
+.Xr libalias 3 ,
+.Xr natd 8 ,
.Xr sysctl 8 ,
.Xr syslogd 8 ,
.Xr pfil 9

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