Install Fights in Linux

To use Netem we need to install traffic control (tc). To do this, we need install the last OpenWRT version (Chaos Chalmer). I tested before on Attitude Adjustment (a previous version) and I couldn't install on it. To install the last version go to this page  and choice your branch (stable or trunk). After install the factory and upgrade binary, run the following commands on your router console (throught ssh): opkg update opkg install tc iptables-mod-ipopt kmod-sched kmod-netem A typical netem example is: tc qdisc change dev eth0 root netem delay 10ms RTNETLINK answers: No such file or directory Remember, load netem first: insmod sch_netem If you have the same problem, run netem with this format: tc qdisc add dev eth0 root handle 1:1 netem delay 10ms Enjoy it!

If you add a Python file to your PATH, maybe you will see this error: from: can't read /var/mail/$First_Library_Name This happend, because you need to be explicit with application you want to run your script. To fix it, just add in the first line of your script the following line: #! /usr/bin/python Enjoy it!

It is very easy! Install gnome-gmail and after set it as your default mail client. sudo apt-get install gnome-gmail Enjoy it!

If you try to run a mininet script like this  , maybe you will get this problem if you are under Ubuntu. Exception: Could not find a default OpenFlow controller  This is trigger because your system don't find a default controller . To enable it just add the first line and add the controller argument to net variable like the second line: from mininet.node import OVSController net = Mininet(topo=topo,host=CPULimitedHost, link=TCLink,controller = OVSController) Now, you will get the following error: c0 Cannot find required executable ovs-controller. Please make sure that it is installed and available in your $PATH: (/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/snap/bin) ovs-controller is a legacy name. You need to be sure that you has it. sudo apt-get install openvswitch-testcontroller sudo cp /usr/bin/ovs-testcontroller /usr/bin/ovs-controller If you run it again, you should kill ovs-testcontroller first to avoid this: Exception: Please shut d