https://geekyschmidt.com/tags/bandwidth/Recent content in Bandwidth onhttps://geekyschmidt.com/2013/09/22/simulating-wan-links-with-linux-and-tc/Sun, 22 Sep 2013 04:10:11 +0000https://geekyschmidt.com/2013/09/22/simulating-wan-links-with-linux-and-tc/<p>Simulating WAN links used to be a difficult process. I would load FreeBSD with a dummynet driver and play with the settings to tweak where I needed it for the activity. OpenBSD with ALTQ made this a step simpler with the ease of bridging adapters. On a recent project for <a href="http://specopstechnology.com" target="_blank">Spec Ops Technology</a>, I needed to simulate a WAN with latency, loss, and randomness.</p> <p>I decided I needed to dig more into the <a href="http://www.linuxfoundation.org/collaborate/workgroups/networking/netem" target="_blank">netem</a> work included in most recent linux distributions. Netem has matured to the point of being a very potent utility for setting up quick testbeds. Additionally with most any modern Linux distro you are online in minutes. I will post a very quick script to get you online:</p>