ipfwrate man page on BSDOS

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IPFWRATE(8)		  BSD System Manager's Manual		   IPFWRATE(8)

NAME
     ipfwrate - set / retrieve BSD IP Rate filters

SYNOPSIS
     ipfwrate [-i] [-M mlen] [-p promise] [-q quant] [-Q qlen] [index [limit]]

DESCRIPTION
     The ipfwrate utility defines or retrieves statistics about the rate fil-
     ters installed in the kernel.

     Rate filters are specified by small positive integers.  A classification
     filter is installed for the rate filtering point (see ipfw(8)).  This
     filter should return either 0, implying the packet should not be fil-
     tered, or the index value of the filter.  If no filter is defined for the
     index returned then the packet is not filtered.

     When limit is not specified then the -M, -p, -Q, and -q flags are ig-
     nored.  If index is specified then statistics about that filter are dis-
     played.  If index is not specified then statistics about all installed
     filters are displayed.

     If limit is specified then a new filter is defined or an existing filter
     is modified.  The limit specifies the maximum number of bits per second
     that are allowed through the filter.  Besides specifying the limit, the
     following parameters may also be specified:

     -i	     When replacing a new filter, reset all statistics associated with
	     a filter and dump any packets in the delay queue.

     -M mlen
	     When the filters promised rate (see below) is reached but not
	     limit, only allow packets to be passed to the output interface if
	     it has fewer than mlen packets in its output queue.  This value
	     defaults to 4.

     -p promise
	     Specify the rate in bits per second that we promise this filter.
	     The system makes no attempt to enforce that the sum of all the
	     promised rates is less than or equal to the theoretical maximum.
	     If too much bandwidth is promised then the promise will not be
	     kept.

     -q quant
	     As long as we have fewer than quant bits of outstanding data, al-
	     low the next packet to be sent.  This defaults to 10 times the
	     minimum value.  The minimum value is 1 system clock cycle worth
	     of data ( limit / clock-rate).

     -Q qlen
	     Queue up to qlen packets before dropping packets.	This defaults
	     to 16.

BUGS
     When the filtering parameters are changed, any packets on the deferred
     queue are dropped.

SEE ALSO
     ipfw(8),  ipfwasm(8),  ipfwcisco(8),  ipfwcmp(8),	ipfwdump(8),
     ipfwlog(8)

				 July 6, 1997				     1
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