Simulating latency and packet loss on a Linux host
Every once and a great while there is a need to simulate bad network behavior. Simulating things like packet loss and high latency are often harder to do than you’d expect. However – if you’re dealing with a Linux host – there’s a simple solution. The ‘tc’ command which comes along with the ‘iproute2’ toolset can help you simulate symptoms of a bad network quite easily.
The tc command offers a lot of functionality but in this post we’re just going to walk through a couple of quick examples of using it in conjunction with the netem (network emulator) included in the Linux kernal . To do this, we’ll use just use two hosts…
To start with – let’s make sure that ‘tc’ is installed and that it’s working…
user@ubuntu-1:~$ sudo tc qdisc show dev ens32 qdisc pfifo_fast 0: root refcnt 2 bands 3 priomap 1 2 2 2 1 2 0 0 1 1 1 1 1 1 1 1 user@ubuntu-1:~$
So what did we just do here? Well we used the tc command to return the current qdisc configuration for our servers physical network interface named ‘ens32’. So what’s a qdisc? Qdisc is shorthand for ‘Queue discipline’ and defines the queuing Continue reading
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