How to limit the speed of local area network under Ubuntu

This article mainly explains "how to limit LAN network speed under Ubuntu". The content in the article is simple and clear, and it is easy to learn and understand. Please follow the editor's train of thought to study and learn "how to limit LAN network speed under Ubuntu".

In order to limit the speed of Internet access on wireless routers and reduce the impact of P2P tools

The Internet speed of the local area network can be limited by arp spoofing and iptables.

Operating system: Ubuntu

1) sudo apt-get install dsniff nmap

2) probe the ip address of the LAN host

The code is as follows:

Sudo nmap-ss Gateway ip/24

In this example:

192.168.1.100 is the main engine with speed limit.

192.168.1.1 is the gateway address

3) turn on the IP forwarding of the kernel to make our host a router

The code is as follows:

Echo 1 > / proc/sys/net/ipv4/ip_forward

4) use iptables and arpspoof for speed limit! The script is as follows

Mode of use:

Sudo. / iptable.sh Speed limit (30 is 40k/s) Gateway ip speed limit host 1 speed limit host 2

The code is as follows:

#! / bin/bash

If [$#-le 2]

Then

Echo "Usage:. / iptables.sh speed gateway ip1 ip2...."

Exit-1

Else

Speed=$1

Gateway=$2

Fi

IPT=/sbin/iptables

While [$#-gt 2]

Do

Shift

Echo $gateway,$2

Arpspoof-I eth0-t $2$ gateway&

Arpspoof-I eth0-t $gateway $2 &

$IPT-A FORWARD-s $2-m limit-- limit ${speed} / s-j accept

$IPT-A FORWARD-d $2-m limit-- limit ${speed} / s-j ACCEPT

$IPT-A FORWARD-s $2-j DROP

$IPT-A FORWARD-d $2-j DROP

Done

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