1. EMOS Group 3
組員：郭柏宏
郭建漢
蕭鼎亞
黃雍文
黃博奕

2. Current Status Networking
User
Router
User
Router
User
User
Router
User
User

3. Current Status of Crowded Networking
User
Router
User
Router
User …
Router
User
User

4. Motivation 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

5. Concept User (S) User User (M) (S) Router User User User User Router …調整
Router
User
User
User
User
User

6. System Blocks
Raspberry Pi
App. & Driver
(含Bandwidth monitoring)

7. HOW ?

8. 用Raspberry Pi接通網路 (Man X2)
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)

9. Boot Materials
加入中文參考資料

10. Boot Materials
加入中文參考資料

11. 存取硬體資源Driver- by Python

12. Python

13. Python

14. 頻寬分配

15. UI

16. UI

17. UI

18. To monitor the network usage
1. A web server - apache
2. A program language build in Pi - Python

19. 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.

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

21. Source Code: Configure the wireless adapter
sudo nano /etc/network/interfaces
auto lo
iface lo inet loopback
iface eth0 inet dhcp
allow-hotplug wlan0
iface wlan0 inet manual
address
netmask
gateway
wpa-roam /etc/wpa_supplicant/wpa_supplicant.conf

22. Source Code: Install and configure a DHCP server
sudo apt-get install isc-dhcp-server
sudo nano /etc/dhcp/dhcpd.conf
subnet netmask {
range ;
option broadcast-address ;
option routers ;
default-lease-time 600;
max-lease-time 7200;
option domain-name "local";
option domain-name-servers , ; }
sudo nano /etc/default/isc-dhcp-server
Change “INTERFACES=""” to “INTERFACES="wlan0"”
sudo service isc-dhcp-server restart

23. Source Code: Install and configure the access point daemon
sudo apt-get install hostapd
sudo nano /etc/hostapd/hostapd.conf
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 nano /etc/default/hostapd
Remove the “#” in front of “DAEMON_CONF” and alter the line to read:
DAEMON_CONF="/etc/hostapd/hostapd.conf"

24. Source Code: Configure IP routing between the wireless and Ethernet (or 2 Wireless Adapters)
sudo nano /etc/sysctl.conf
Find 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 IPv4
net.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 MASQUERADE
sudo iptables -A FORWARD -i eth0 -o wlan0 -m state --state RELATED,ESTABLISHED -j ACCEPT
sudo 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