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ALTQ(4)                FreeBSD 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), le(4), lnc(4), my(4), nve(4), re(4), rl(4),
     sf(4), sis(4), sk(4), ste(4), stge(4), vr(4), wi(4), and xl(4).

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

     The tun(4) and ng_iface(4) pseudo drivers also do support ALTQ.

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

FreeBSD 6.2                      July 25, 2006                     FreeBSD 6.2


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