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@@ -1,80 +1,82 @@
 .\"
 .\" $FreeBSD$
 .\"
 .Dd September 10, 2021
 .Dt DUMMYNET 4
 .Os
 .Sh NAME
 .Nm dummynet
 .Nd traffic shaper, bandwidth manager and delay emulator
 .Sh DESCRIPTION
 The
 .Nm
 system facility permits the control of traffic
 going through the various network interfaces, by applying bandwidth
 and queue size limitations, implementing different scheduling and queue
 management policies, and emulating delays and losses.
 .Pp
 The user interface for
 .Nm
 is implemented by the
 .Xr dnctl 8
 utility, so please refer to the
 .Xr dnctl 8
 manpage for a complete description of the
 .Nm
 capabilities and how to use it.
 .Ss Kernel Options
 The following options in the kernel configuration file are related to
 .Nm
 operation:
 .Pp
 .Bl -tag -width ".Dv IPFIREWALL_VERBOSE_LIMIT" -offset indent -compact
 .It Dv IPFIREWALL
-enable ipfirewall (required for
-.Nm )
+enable ipfirewall (if
+.Nm
+is to be used with ipfw)
 .It Dv IPFIREWALL_VERBOSE
 enable firewall output
 .It Dv IPFIREWALL_VERBOSE_LIMIT
 limit firewall output
 .It Dv DUMMYNET
 enable
 .Nm
 operation
 .It Dv HZ
 set the timer granularity
 .El
 .Pp
 Generally, the following options are required:
 .Bd -literal -offset indent
 options IPFIREWALL
 options DUMMYNET
 options HZ=1000		# strongly recommended
 .Ed
 .Pp
 Additionally, one may want to increase the number
 of mbuf clusters (used to store network packets) according to the
 sum of the bandwidth-delay products and queue sizes of all configured
 pipes.
 .Sh SEE ALSO
 .Xr setsockopt 2 ,
 .Xr if_bridge 4 ,
 .Xr ip 4 ,
 .Xr ipfw 8 ,
 .Xr dnctl 8 ,
+.Xr pf.conf 5 ,
 .Xr sysctl 8
 .Sh HISTORY
 The
 .Nm
 facility
 was initially implemented as a testing tool for
 .Tn TCP
 congestion control by
 .An Luigi Rizzo Aq Mt luigi@iet.unipi.it ,
 as described on ACM Computer Communication Review, Jan.97 issue.
 Later it has been modified to work at the
 .Tn IP
 and bridging levels, integrated with the
 .Xr ipfw 4
 packet filter, and extended to
 support multiple queueing and scheduling policies.