Spring 2021, Mondays 5:30-8:00
February 22
After running mininet, the backspace key may not work. Fix it with this:
stty erase ^H
(where ^H is how the backspace key appears in one of the terminal windows before things are fixed.)
ping google.com
Hurricane Electric
Local routing
How HTB and netem interact (HTB for bandwidth, netem for queue and delay)
Experiment 1: BottleneckBW = 2 MB/s, DELAY=400ms, QUEUE=100
verifying the settings
Why is the very first ping almost always exactly two RTTs?
Cubic wins 0.34 to 2.0. But also look at how long everything is taking.
Delay=400ms, QUEUE=200: Cubic wins, 1.61 to 2.0 [??]
Delay = 400ms, QUEUE=400: Reno wins 2.0 to .33
Delay = 400ms, QUEUE=bw × delay:
Hierarchical queuing and finishing times
Token Bucket
Bucket=1/60 second
History of "real-time internet"
UDP
Zoom and CDNs