Set maximum upload/download speed limit to your linux server/pc's selected network interface.

script.sh

#!/bin/bash
#usage: sudo IF=eth0 UPLOAD_SPEED_LIMIT=300kbps DOWNLOAD_SPEED_LIMIT=300kbps ./script.sh

modprobe ifb numifbs=1
ip link set dev ifb0 up

tc qdisc delete dev $IF handle ffff: ingress
tc qdisc add dev $IF handle ffff: ingress
tc filter add dev $IF parent ffff: protocol ip u32 match u32 0 0 action mirred egress redirect dev ifb0

tc qdisc delete dev $IF root
tc qdisc add dev $IF root handle 1: htb default 1
tc class add dev $IF parent 1: classid 1:1 htb rate $UPLOAD_SPEED_LIMIT

tc qdisc delete dev ifb0 root
tc qdisc add dev ifb0 root handle 1: htb default 1
tc class add dev ifb0 parent 1: classid 1:1 htb rate $DOWNLOAD_SPEED_LIMIT