Ubuntu linux tc命令don'；不要限制下载速度

我已经写了一个脚本，可以让我通过Ubuntu 18.04.5 LTS上的

ts

工具限制带宽

问题是，即使上传速度被正确地限制在我在脚本上设置的限制之内，下载速度也不会受到限制，我不明白为什么

这里是链接

#!/bin/bash  
# Full path to tc binary 

TC=$(which tc)

interface=ens33
interface_speed=100mbit
ip=192.168.42.130 # The IP address bound to the interface

download_limit=512kbit
upload_limit=1mbit    
    
# Filter options for limiting the intended interface.
FILTER="$TC filter add dev $interface protocol ip parent 1: prio 1 u32"

function start_tc { 
    tc qdisc show dev $interface | grep -q "qdisc pfifo_fast 0"
    tc qdisc del dev $interface root; sleep 1
    #[ "$?" -gt "0" ] && tc qdisc del dev $interface root; sleep 1  

    # start the tc configuration
    $TC qdisc add dev $interface root handle 1: htb default 30
    $TC class add dev $interface parent 1: classid 1:1 htb rate $interface_speed burst 15k

    $TC class add dev $interface parent 1:1 classid 1:10 htb rate $download_limit burst 15k
    $TC class add dev $interface parent 1:1 classid 1:20 htb rate $upload_limit burst 15k

    $TC qdisc add dev $interface parent 1:10 handle 10: sfq perturb 10
    $TC qdisc add dev $interface parent 1:20 handle 20: sfq perturb 10

    # Apply the filter rules
    
    # Catch-all IP rules, which will set global limit on the server
    # for all IP addresses on the server. 
    $FILTER match ip dst 0.0.0.0/0 flowid 1:10
    $FILTER match ip src 0.0.0.0/0 flowid 1:20

    # If you want to limit the upload/download limit based on specific IP address
    # you can comment the above catch-all filter and uncomment these:
    #
    # $FILTER match ip dst $ip/32 flowid 1:10
    # $FILTER match ip src $ip/32 flowid 1:20
}

function show_status {
        $TC -s qdisc ls dev $interface
}
#
# Display help 
#
function display_help {
        echo "Usage: tc [OPTION]"
        echo -e "\tstart - Apply the tc limit"
        echo -e "\tstatus - Show status"
}

# Start
if [ -z "$1" ]; then
        display_help
elif [ "$1" == "start" ]; then
        start_tc
elif [ "$1" == "status" ]; then
        show_status
fi

---

一个可能的解决办法是

$TC qdisc del dev $IF root
echo "== DELETE DONE =="

$TC qdisc add dev $IF root handle 1:0 htb default 10

$TC class add dev $IF parent 1:0 classid 1:1 htb rate $LIMIT

$TC class add dev $IF parent 1:1 classid 1:10 htb rate 5mbit ceil $LIMIT_1
$TC class add dev $IF parent 1:1 classid 1:30 htb rate 5mbit ceil $LIMIT_2

$TC filter add dev $IF protocol ip parent 1:0 prio 2 u32 match ip dst x.x.x.x flowid 1:10
$TC filter add dev $IF protocol ip parent 1:0 prio 1 u32 match ip dst x.x.x.x flowid 1:30

echo "== SHAPING DONE =="

其中，$IF是您要使用的网络接口，$TCTC命令的路径（请确保在脚本顶部设置

TC=/sbin/TC

，因为代码中似乎没有路径

PS x.x.x.x是要与带宽限制绑定的IP地址