simulate_network_failure.md

Simulating Network Failure

The idea here is to simulate a struggling network connection. This is useful in destructive testing mostly. You want to observe how the application fails, or as I like to say, "Determining what failure looks like."

Drop n% of Incoming/Outgoing Packets (Packet Loss Simulation)

iptables -A INPUT -m statistic --mode random --probability 0.1 -j DROP iptables -A OUTPUT -m statistic --mode random --probability 0.1 -j DROP

Simulate Network Latency with loss and bandwidth limitations

tc qdisc add dev eth0 root netem delay 250ms loss 10% rate 1mbps

Add jitter to latency

tc qdisc add dev eth0 root netem delay 50ms 20ms

Distribution makes jitter more real

tc qdisc add dev eth0 root netem delay 50ms 20ms distribution normal

Reorder, duplicate, and corrupt packets

tc qdisc add dev eth0 root netem reorder 0.02 duplicate 0.05 corrupt 0.01