emos group 3 組員：郭柏宏 郭建漢 蕭鼎亞 黃雍文 黃博奕. current status networking...

EMOS Group 3

組員：郭柏宏 郭建漢 蕭鼎亞

黃雍文 黃博奕

　 Current Status Networking

Router

Router

Router

User

User

User

User

User

User

Router

Router

Router

User

User

User

User

User

…

　 Current Status of Crowded Networking

• 通訊 Bandwidth 浪費在重覆註冊連線上• 階層化 (Hierarchy) 的網路連線與頻寬分配• Web-Browser 的網路 UI• 頻寬分配之監控

Motivation

Concept

Router

Router

Router

User(M)

User

User

User

User

User

User(S)

User(S)

User

User

User

User

User

User

User

…

System BlocksRaspberry Pi

App. & Driver

( 含 Bandwidth monitoring)

HOW ?

技術與人力分工圖

資本主義之共產網路 Router

用 Raspberry Pi 接通網路

(Man X2)

UI & 頻寬監控

(Man x1)

頻寬分享Driver & 程式

(Man X2)

Boot Materials

Boot Materials

存取硬體資源 Driver- by Python

Python

Python

頻寬分配

UI

UI

UI

To monitor the network usage

1. A web server - apache

2. A program language build in Pi - Python

web server

GPIO

Common Gateway

interface

To access the hardware resources, we should use GPIO on Pi to get the information. Then we can monitor the usage of wifi and manage the bandwidth which is shared with users.

Reference

• http://pingbin.com/2012/12/setup-wifi-raspberry-pi/

• http://wwssllabcd.github.io/blog/2013/01/31/how-to-setup-raspberry-pi/

• http://www.maketecheasier.com/set-up-raspberry-pi-as-wireless-access-point/

Source Code: Configure the wireless adapter

• auto lo• • iface lo inet loopback• iface eth0 inet dhcp• • allow-hotplug wlan0• iface wlan0 inet manual• address 192.168.0.100• netmask 255.255.255.0• gateway 192.168.0.1• wpa-roam /etc/wpa_supplicant/wpa_supplicant.conf

sudo nano /etc/network/interfaces

Source Code: Install and configure a DHCP server

• subnet 192.168.42.0 netmask 255.255.255.0 {• range 192.168.42.10 192.168.42.50;• option broadcast-address 192.168.42.255;• option routers 192.168.42.1;• default-lease-time 600;• max-lease-time 7200;• option domain-name "local";• option domain-name-servers 8.8.8.8, 8.8.4.4;• }

sudo apt-get install isc-dhcp-serversudo nano /etc/dhcp/dhcpd.conf

sudo nano /etc/default/isc-dhcp-serverChange “INTERFACES=""” to “INTERFACES="wlan0"”

sudo service isc-dhcp-server restart

Source Code: Install and configure the access point daemon

• interface=wlan0• driver=nl80211• #driver=rtl871xdrv• ssid=MyPi• hw_mode=g• channel=6• macaddr_acl=0• auth_algs=1• ignore_broadcast_ssid=0• wpa=2• wpa_passphrase=raspberry• wpa_key_mgmt=WPA-PSK• wpa_pairwise=TKIP• rsn_pairwise=CCMP

sudo apt-get install hostapdsudo nano /etc/hostapd/hostapd.conf

sudo nano /etc/default/hostapdRemove the “#” in front of “DAEMON_CONF” and alter the line to read:DAEMON_CONF="/etc/hostapd/hostapd.conf"

Source Code: Configure IP routing between the wireless and Ethernet (or 2 Wireless Adapters)

sudo nano /etc/sysctl.confFind the line which reads “Uncomment the next line to enable packet forwarding for IPv4” and uncomment the next line like this:# Uncomment the next line to enable packet forwarding for IPv4net.ipv4.ip_forward=1

Run the following command to activate forwarding now:sudo sh -c "echo 1 > /proc/sys/net/ipv4/ip_forward"Now turn the Pi into a router with the follow commands:sudo iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADEsudo iptables -A FORWARD -i eth0 -o wlan0 -m state --state RELATED,ESTABLISHED -j ACCEPTsudo iptables -A FORWARD -i wlan0 -o eth0 -j ACCEPT( 如果要用兩張網卡一收一發 , 就把 eth0 & wlan0 改成 wlan0 & wlan1)And save the routing tables into the file “/etc/iptables.ipv4.nat”sudo sh -c "iptables-save > /etc/iptables.ipv4.nat”

Edit “/etc/network/interfaces“:sudo nano /etc/network/interfaces

And add the following line to the end of the file. This line will restore the routing table whenever the Pi is booted:pre-up iptables-restore < /etc/iptables.ipv4.nat