Because my University seems to have worse internet connectivity than my house
During my day job as sys-admin for the a Particle Physics Group, I recently was wrapped on the knuckles by central IT for one of our users saturating the whole university's bandwidth. My first reaction was of surprise that they didn't have traffic throttling in place already but this turned to incredulity when I learnt that they only had a 1Gb/s connection for the WHOLE CAMPUS and one of our guys just downloading some LHC data from a couple of fast sites in the UK had brought the entire system to it's knees. Consequently, I was asked to stop people doing this (!) until the network had been upgraded to 10Gb/s. I decided that setting up some traffic shaping on our machines was probably a better idea.
A quick search led to this page that described how to use the tc command provided by the iptables package to do exactly what I needed and even provided a nice bash script to do the job - problem solved! At some point in the future I may update this post with the actual ins and outs of how the script works (when I've figured it out myself!) but until then, just grab the script, change the download/upload limits as you wish and off you go :)
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