throttle.sh
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throttle.sh
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	#!/bin/bash

	# Throttle local network connections

	set -x

	# Requires kernel-modules-extra (and perhaps kernel-debug-modules-extra) and a reboot
	sudo modprobe sch_netem \|\| exit 1

	INTERFACE=$(sudo route \| grep -m 1 '^default' \| grep -o '[^ ]*$' \| tr -d '\n')

	if [[ $1 == "stop" ]]
	then
	echo "Stopping"
	sudo tc qdisc del dev $INTERFACE root
	sudo tc qdisc del dev $INTERFACE ingress
	sudo tc qdisc del dev ifb0 root
	exit 0
	fi

	DOWN=500
	UP=500
	HALFWAYRTT=10

	echo "Throttling $INTERFACE Up $UP Down $DOWN RTT/2 $HALFWAYRTT"
	# Setup:
	# This creates a virtual ifb interface to redirect ingress traffic over it,
	# so we can then apply egress rules to the mirrored ingress traffic.
	# This allows to use the more flexible egress rules for ingress traffic, instead of the more limited tc ingress filters.
	sudo modprobe ifb \|\| exit 1
	sudo ip link set dev ifb0 up
	sudo tc qdisc add dev $INTERFACE ingress
	sudo tc filter add dev $INTERFACE parent ffff: protocol ip u32 match u32 0 0 flowid 1:1 action mirred egress redirect dev ifb0

	# Set bandwith
	sudo tc qdisc add dev ifb0 root handle 1:0 netem delay ${HALFWAYRTT}ms rate ${DOWN}kbit
	sudo tc qdisc add dev $INTERFACE root handle 1:0 netem delay ${HALFWAYRTT}ms rate ${UP}kbit