Build

This builds on all RHEL7 / CentOS 7 releases. Make sure the linux kernel-headers package is installed.

 $ make all

The build will produce:

ipfw_mod.ko: the kernel module
ipfw: the userland program

Operation

Load the kernel module

# insmod ./kipfw-mod/ipfw_mod.ko

Add some ipfw rules

# ipfw -q flush
# ipfw -q pipe flush
# ipfw add pipe 3 in dst-port 80,443,8080
# ipfw pipe 3 config delay 30ms bw 80000Kbit/s plr 0.00 queue 1000Kbytes jitter 50ms queue-delay 100ms queue-increments 50

This would setup a pipe with

30ms delay
80Mbps bandwidth
0% packet loss
1MB Queue
50ms jitter on the connection
Queue delay of 100ms - so as 1MB Queue fills this will be an additional delay added
Queue increments of 50 so 100ms/50 means 2ms of delay added for each equivalent portion of the 1MB queue filled

Additional options to use in ipfw rules i.e. jitter/queue-delay/queue-increments

# ipfw -q flush
# ipfw -q pipe flush
# ipfw add pipe 3 in dst-port 80,443,8080
# ipfw pipe 3 config delay 80ms bw 40Mbit/s plr 0.01 queue 1000Kbytes

Unload the kernel module

# rmmod ipfw_mod.ko

Authors

This directory contains a port of ipfw and dummynet to Linux and Windows. This version of ipfw and dummynet is called "ipfw3" as it is the third major rewrite of the code. The source code here comes straight from FreeBSD (roughly the version in HEAD as of February 2010), plus some glue code and headers written from scratch. Unless specified otherwise, all the code here is under a BSD license.

CREDITS:

Luigi Rizzo (main design and development)
Marta Carbone (Linux and Planetlab ports)
Riccardo Panicucci (modular scheduler support)
Francesco Magno (Windows port)
Fabio Checconi (the QFQ scheduler)
Funding from Universita` di Pisa (NETOS project),
European Commission (ONELAB2 project)
ACM SIGCOMM (Sigcomm Community Projects Award, April 2012)

nmcconom / dummynet