bufferbloat.sh

#!/usr/bin/env bash

# Examples:
#	bufferbloat start eth0 20 20
#	bufferbloat stop eth0

self="$(basename $(/usr/bin/realpath ${0}))"
isp_uplink="${2}"
isp_downlink="ifb0"
max_download="${3}"
max_upload="${4}"

case "$1" in
    start)
		## downlink
		ip link add name ${isp_downlink} type ifb
		ip link set dev ${isp_downlink} up
		tc qdisc add dev ${isp_uplink} handle ffff: ingress
		tc qdisc add dev ${isp_downlink} root cake bandwidth ${max_download}mbit besteffort wash
		tc filter add dev ${isp_uplink} parent ffff: protocol ip u32 match u32 0 0 action mirred egress redirect dev ${isp_downlink}

		## uplink
		tc qdisc add dev ${isp_uplink} root cake bandwidth ${max_upload}mbit
	;;
    stop)
		tc qdisc del dev ${isp_uplink} handle ffff: ingress
		tc qdisc del dev ${isp_uplink} root
		tc qdisc del dev ${isp_downlink} root
		ip link del name ${isp_downlink}
	;;
    *)
		echo "Usage: ${self} <start|stop> <external interface> <downlink mbps> <uplink mbps>"
		exit 1
	;;
esac

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