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ALTQ(4)			 BSD Kernel Interfaces Manual		       ALTQ(4)

     ALTQ -- alternate queuing of network packets

     options ALTQ

     options ALTQ_CBQ
     options ALTQ_RED
     options ALTQ_RIO
     options ALTQ_HFSC
     options ALTQ_CDNR
     options ALTQ_PRIQ

     The ALTQ framework	provides several disciplines for queuing outgoing net-
     work packets.  This is done by modifications to the interface packet
     queues.  See altq(9) for details.

     The user interface	for ALTQ is implemented	by the pfctl(8)	utility, so
     please refer to the pfctl(8) and the pf.conf(5) manpages for a complete
     description of the	ALTQ capabilities and how to use it.

   Kernel Options
     The following options in the kernel configuration file are	related	to
     ALTQ operation:

     ALTQ	 Enable	ALTQ.
     ALTQ_CBQ	 Build the "Class Based	Queuing" discipline.
     ALTQ_RED	 Build the "Random Early Detection" extension.
     ALTQ_RIO	 Build "Random Early Drop" for input and output.
     ALTQ_HFSC	 Build the "Hierarchical Packet	Scheduler" discipline.
     ALTQ_CDNR	 Build the traffic conditioner.	 This option is	meaningless at
		 the moment as the conditioner is not used by any of the
		 available disciplines or consumers.
     ALTQ_PRIQ	 Build the "Priority Queuing" discipline.
     ALTQ_NOPCC	 Required for SMP builds.
     ALTQ_DEBUG	 Enable	additional debugging facilities.

     Note that ALTQ-disciplines	cannot be loaded as kernel modules.  In	order
     to	use a certain discipline you have to build it into a custom kernel.
     The pf(4) interface, that is required for the configuration process of
     ALTQ can be loaded	as a module.

     The driver	modifications described	in altq(9) are required	to use a cer-
     tain network card with ALTQ.  They	have been applied to the following
     hardware drivers: an(4), ath(4), awi(4), bfe(4), bge(4), dc(4), de(4),
     ed(4), em(4), fxp(4), hme(4), lnc(4), re(4), rl(4), sf(4),	sis(4),	sk(4),
     ste(4), vr(4), wi(4), and xl(4).

     The ndis(4) framework also	has support for	ALTQ and thus all encapsulated

     The tun(4)	pseudo driver also does	support	ALTQ and includes the required

     pf(4), pf.conf(5),	ipfw(8), pfctl(8), altq(9)

BSD				 July 07, 2005				   BSD


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