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Simulate a Terrible Internet Connection
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Simulate a Terrible Internet Connection

The Linux networking stack is the Swiss Army Knife of the tech world.

Using iptables, drop a random 10% of incoming and outgoing packets:

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

To reset:

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

Same thing using tc but adding some delay, reorders and dups:

tc qdisc add dev eth0 root netem delay 50ms 20ms distribution normal
tc qdisc change dev eth0 root netem reorder 0.02 duplicate 0.05 corrupt 0.01

To reset:

tc qdisc del dev eth0 root netem

That's it.

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