DUMMYNET (4) | Special files and drivers | Unix Manual Pages | :man ▋
NAME
dummynet - traffic shaper, bandwidth manager and delay emulator
CONTENTS
Description Kernel Options See Also History
DESCRIPTION
The dummynet 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. The user interface for dummynet is implemented by the ipfw (8) utility, so please refer to the ipfw (8) manpage for a complete description of the dummynet capabilities and how to use it.
Kernel Options
The following options in the kernel configuration file are related to dummynet operation:
IPFIREWALL enable ipfirewall (required for dummynet ) IPFIREWALL_VERBOSE enable firewall output IPFIREWALL_VERBOSE_LIMIT limit firewall output DUMMYNET enable dummynet operation NMBCLUSTERS set the amount of network packet buffers HZ set the timer granularity
Generally, the following options are required:
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.
SEE ALSO
setsockopt (2),bridge (4),if_bridge (4),ip (4),ipfw (8),sysctl (8)
HISTORY
ipfw (4)
