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HowTo: Change Bandwidth and Latency on MacOS
HowTo: Change Bandwidth and Latency on MacOS
- Rahim Rahman
Owned by Rahim Rahman
The purpose of changing bandwidth and latency on MacOS or Linux machine is to simulate running Mattermost applications on low bandwidth and/or high latency connectivity. This can be done locally, or (hopefully) on Github Runner
Applications like Charles Proxy or Network Link Conditioner (MacOS system preference) can be downloaded and have the ability to throttle bandwidth & latency using GUI. However, it is not easily installable in CICD runners like Github.
# must be done as a sudoer
sudo su
dnctl -q flush
dnctl -q pipe flush
pfctl -f /etc/pf.conf
pfctl -E
# disabling, flushing and resetting
pfctl -d
dnctl -q flush
dnctl -q pipe flush
dnctl pipe 1 config delay 0ms noerror
dnctl pipe 2 config delay 0ms noerror
echo "dummynet in from mobile-e2e-site-1.test.mattermost.cloud to ! 127.0.0.1 pipe 1
dummynet out from ! 127.0.0.1 to mobile-e2e-site-1.test.mattermost.cloud pipe 2" | sudo pfctl -f -
# pipe 1 is download, below is 3.3Mb/s with 1000ms latency
dnctl pipe 1 config bw 3300Kbit/s delay 1000ms
# pipe 2 is upload, below is 3.3Mb/s with 1000ms latency
dnctl pipe 2 config bw 3300Kbit/s delay 1000ms
# enabling, -E
pfctl -E
# to stop, -d
pfctl -d
# to completely reset, do the "disabling, flushing and resetting"
references:
most of the commands were inspired from this package