DUMMYNET(4) BSD Kernel Interfaces Manual DUMMYNET(4)NAME
dummynet -- traffic shaper, bandwidth manager and delay emulator
DESCRIPTION
dummynet is a system facility that 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 dnctl program, so the reader is referred to the dnctl(8) manpage for a complete
description of the capabilities of dummynet and on how to use it.
SEE ALSO dnctl(8), setsockopt(2), bridge(4), ip(4), sysctl(8)HISTORY
dummynet was initially implemented as a testing tool for TCP congestion control by Luigi Rizzo <luigi@iet.unipi.it>, as described on ACM Com-
puter Communication Review, Jan.97 issue. Later it has been then modified to work at the ip and bridging level, integrated with the IPFW
packet filter, and extended to support multiple queueing and scheduling policies.
Darwin October 28, 2002 Darwin
Check Out this Related Man Page
DUMMYNET(4) BSD Kernel Interfaces Manual DUMMYNET(4)NAME
dummynet -- traffic shaper, bandwidth manager and delay emulator
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
HZ set the timer granularity
Generally, the following options are required:
options IPFIREWALL
options DUMMYNET
options HZ=1000 # strongly recommended
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), if_bridge(4), ip(4), ipfw(8), sysctl(8)HISTORY
The dummynet facility was initially implemented as a testing tool for TCP congestion control by Luigi Rizzo <luigi@iet.unipi.it>, as
described on ACM Computer Communication Review, Jan.97 issue. Later it has been modified to work at the IP and bridging levels, integrated
with the ipfw(4) packet filter, and extended to support multiple queueing and scheduling policies.
BSD October 28, 2002 BSD
My question is such:
I want to control the bandwidth of my users and cap there speed on the network. I was told by a Cisco rep that it is better to police or control the bandwidth at the switch and not via the router. It that the correct place to control bandwidth at the switch or would it be... (0 Replies)
I am using dummynet in bridge mode. and its working fine.
Now I have built another box (freebsd 7.1) in router mode. On this box I have two NICs, one for lan and one for wan. both networks are segmented physically and logically i-e both interfaces have different ip pools and connected to... (0 Replies)
Hi All
I am resilience testing an application that is spread across multiple servers.
One thing I will need to do soon is throttle the network traffic for specific interfaces within the test cluster. Specifically, maybe make a connection take twice or three times as long to respond....
I... (3 Replies)
Dear Engineer,
Can anyone please inform me some application name like (CBQ) to control network bandwidth and please provide me the url to configure it.
With Best Regards,
Md. Abdullah-Al Kauser (0 Replies)
Dear Engineer,
Can anyone please inform me some application name like (CBQ) to control network bandwidth and please provide me the url to configure it.
With Best Regards,
Md. Abdullah-Al Kauser (1 Reply)