In order to adjust the bandwidth rate, we first need to know how much bandwidth our bridge has. Fortunately, there is a nice script to run a speed test from your command line that is appropriately called speedtest-cli. This is installed with the following command:

sudo pip install git+https://github.com/sivel/speedtest-cli.git

Run the test with the following command:

speedtest-cli --simple > speedtest.txt

If you inspect the output file, you should see something like the following:

Ping: 107.686 ms
Download: 28.23 Mbit/s
Upload: 5.37 Mbit/s

We'll use the results in this file as the basis for our bandwidth adjustment. At the moment, we only need to remember its location for later use.