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+.\" $NetBSD: altq.4,v 1.9 2026/03/07 15:51:38 christos Exp $
+.\"
+.\" Copyright (c) 2011 Jukka Ruohonen <jruohonen@iki.fi>
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\"
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+.\" "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+.\" LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+.\" A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+.\" OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+.\" SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+.\" LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+.\" OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+.\"
+.Dd March 7, 2026
+.Dt ALTQ 4
+.Os
+.Sh NAME
+.Nm altq
+.Nd alternate queuing framework
+.Sh SYNOPSIS
+.Cd options ALTQ
+.Cd options ALTQ_BLUE
+.Cd options ALTQ_CBQ
+.Cd options ALTQ_CDNR
+.Cd options ALTQ_FIFOQ
+.Cd options ALTQ_FLOWVALVE
+.Cd options ALTQ_HFSC
+.Cd options ALTQ_LOCALQ
+.Cd options ALTQ_PRIQ
+.Cd options ALTQ_RED
+.Cd options ALTQ_RIO
+.Cd options ALTQ_WFQ
+.Sh DESCRIPTION
+The
+.Nm
+system is a framework which provides several disciplines for queuing outgoing
+network packets.
+While traffic shaping is perhaps the most prominent example,
+.Nm
+provides also other measures related to QoS.
+The framework has been integrated to the
+.Xr pf 4
+packet filter since
+.Nx 4.0 .
+.Pp
+At the implementation level
+.Nm
+modifies the interface packet queues.
+Therefore the driver modifications described in
+.Xr altq 9
+are required in order to use a certain network card with
+.Nm .
+.Sh FILES
+.Bd -literal
+/dev/altq
+.Ed
+.Sh SEE ALSO
+.Xr pf 4 ,
+.Xr altq.conf 5 ,
+.Xr altqd 8 ,
+.Xr altq 9
+.Rs
+.%A Kenjiro Cho
+.%T Fitting theory into reality in the ALTQ case
+.%D March, 2004
+.%C Taipei, Taiwan
+.%O Asia BSD conference
+.%U https://www.iijlab.net/~kjc/papers/fittingtheory.pdf
+.Re
+.Sh HISTORY
+The
+.Nm
+system first appeared in March 1997 and found its home in the KAME project
+.Lk ( https://www.kame.net ) .
+It was imported into
+.Nx 1.6 .
+.Sh CAVEATS
+Please note that you must compile
+.Xr pf 4
+in the kernel, using the PF
+.Xr module 7
+alongside
+.Nm
+built in the kernel will not work.