tcconfig

• Summary
  • Traffic control
• Usage
  • Set traffic control (tcset command)
  • Delete traffic control (tcdel command)
  • Display traffic control configurations (tcshow command)
  • For more information
• Installation
  • Install via pip (recommended)
  • Install in Debian/Ubuntu from a deb package
• Dependencies
  • Linux packages
  • Linux kernel module
  • Python packages
• Documentation
• Troubleshooting
• Docker image

Summary

tcconfig is a tc command wrapper. Make it easy to set up traffic control of network bandwidth/latency/packet-loss/packet-corruption/etc. to a network-interface/Docker-container(veth).

Traffic control

Setup traffic shaping rules

Easy to apply traffic shaping rules to specific network:

• Outgoing/Incoming packets
• Source/Destination IP-address/network (IPv4/IPv6)
• Source/Destination ports

Available parameters

The following parameters can be set to network interfaces:

• Network bandwidth rate [G/M/K bps]
• Network latency [microseconds/milliseconds/seconds/minutes]
• Packet loss rate [%]
• Packet corruption rate [%]
• Packet duplicate rate [%]
• Packet reordering rate [%]

Targets

• Network interfaces: e.g. eth0
• Docker container (veth corresponding with a container)

Usage

Set traffic control (tcset command)

tcset is a command to add traffic control rule to a network interface (device).

e.g. Set a limit on bandwidth up to 100Kbps

# tcset eth0 --rate 100Kbps

e.g. Set network latency

You can use time units (such as us/sec/min/etc.) to designate delay time.

Set 100 milliseconds network latency

# tcset eth0 --delay 100ms

Set 10 seconds network latency

# tcset eth0 --delay 10sec

Set 0.5 minutes (30 seconds) network latency

# tcset eth0 --delay 0.5min

You can also use the following time units:

Unit	Available specifiers (str)
hours	h/hour/hours
minutes	m/min/mins/minute/minutes
seconds	s/sec/secs/second/seconds
milliseconds	ms/msec/msecs/millisecond/milliseconds
microseconds	us/usec/usecs/microsecond/microseconds

e.g. Set 0.1% packet loss

# tcset eth0 --loss 0.1%

e.g. All of the above settings at once

# tcset eth0 --rate 100Kbps --delay 100ms --loss 0.1%

e.g. Specify the IP address of traffic control

# tcset eth0 --delay 100ms --network 192.168.0.10

e.g. Specify the IP network and port of traffic control

# tcset eth0 --delay 100ms --network 192.168.0.0/24 --port 80

Set traffic control to a docker container

Execute tcconfig with --docker option on a Docker host:

# tcset <container name or ID> --docker ...

You could use --src-container/--dst-container options to specify source/destination container.

Set traffic control within a docker container

You need to run a container with --cap-add NET_ADMIN option if you you would like to set a tc rule within a container:

docker run -d --cap-add NET_ADMIN -t <docker image>

A container image that builtin tcconfig can be available at https://hub.docker.com/r/thombashi/tcconfig/

Delete traffic control (tcdel command)

tcdel is a command to delete traffic shaping rules from a network interface (device).

e.g. Delete traffic control of eth0

You can delete all of the shaping rules for the eth0 with -a/--all option:

# tcdel eth0 --all

Display traffic control configurations (tcshow command)

tcshow is a command to display the current traffic control settings for network interface(s).

Example

# tcset eth0 --delay 10ms --delay-distro 2  --loss 0.01% --rate 0.25Mbps --network 192.168.0.10 --port 8080
# tcset eth0 --delay 1ms --loss 0.02% --rate 500Kbps --direction incoming
# tcshow eth0
{
    "eth0": {
        "outgoing": {
            "dst-network=192.168.0.10/32, dst-port=8080, protocol=ip": {
                "filter_id": "800::800",
                "delay": "10.0ms",
                "delay-distro": "2.0ms",
                "loss": "0.01%",
                "rate": "250Kbps"
            }
        },
        "incoming": {
            "protocol=ip": {
                "filter_id": "800::800",
                "delay": "1.0ms",
                "loss": "0.02%",
                "rate": "500Kbps"
            }
        }
    }
}

For more information

More examples are available at https://tcconfig.rtfd.io/en/latest/pages/usage/index.html

Installation

Install via pip (recommended)

tcconfig can be installed from PyPI via pip (Python package manager) command.

sudo pip install tcconfig

Install in Debian/Ubuntu from a deb package

ARCHIVE_URL=$(curl -sL https://api.github.com/repos/thombashi/tcconfig/releases/latest | jq -r '.assets[].browser_download_url') &&
TEMP_DEB="$(mktemp)" &&
wget -O "${TEMP_DEB}" "${ARCHIVE_URL}" &&
sudo dpkg -i "${TEMP_DEB}"
rm -f "${TEMP_DEB}"

Dependencies

Python 2.7+ or 3.5+

Linux packages

• mandatory: required for tc command:

  • Ubuntu/Debian: iproute2
  • Fedora/RHEL: iproute-tc

• optional: required to when you use --iptables option:

  • iptables

Linux kernel module

• sch_netem

Python packages

Dependency python packages are automatically installed during tcconfig installation via pip.

• DataProperty
• docker
• humanreadable
• logbook
• msgfy
• pyparsing
• six
• subprocrunner
• typepy
• voluptuous

Optional Python packages

• netifaces

  • Suppress excessive error messages if this package installed

• Pygments

Test dependencies

• allpairspy
• pingparsing
• pytest
• pytest-runner
• tox

Documentation

https://tcconfig.rtfd.io/

Troubleshooting

https://tcconfig.rtfd.io/en/latest/pages/troubleshooting.html

Docker image

https://hub.docker.com/r/thombashi/tcconfig/