Kernel Network On Linux OS

Problem 0 : We have two network cards  for  local and public  network .  We want  that Network 0  will use to access external network  and Network 1 will use for  internal network . How to check   status and configure it .

Solution: Route use  to control the flow of  all packages
+ Some  command lines : we must use "ip route" to configure it.
   -  "ip route"
  -   "ip route replace default 10.1.0.1"
+ Download source  code
+ How to rebuild and  makefile



Problem 1 :  We want to pulse in  Wi-Fi Adapter via  USB port  , How to  mange and control Wi-Fi on  Linux OS
+  Detect WiFi device
+  Check status of device . Up device if it downs
+  Check connection  to access  external network.

Solution: when we want to use WiFi, Ethernet or Bluetooth , We have to do two steps . the first step , we have to be enable  them by using "connect manger" tool or "Network manager" tool  to permit  them action  .  For Example : If you  have Bluetooth device,we need to install "connman" package (sudo apt-get install  connman) . After installing  "connman" package  , we will see new file in "/var/lib/connman/settings" . 
Now we will open file settings"  to check status of devices 

cat /var/lib/connman/settings

We  will see something like this

[global]
OfflineMode=false

[Wired]
Enable=true

[WiFi]
Enable=false

[Bluetooth]
Enable=false

Detect  device via  USB Port :  + Using "lsusb" command
                                                   + Download source
                                                    + Build and makefile

Check status of device : using  "ipconfig" command line


               
                                                                                                                                                Thong  LT


Referents: + https://www.netbsd.org
                   +http://michaelhleonard.com


//======================================================
Connection Manager

https://github.com/IntelOpenDesign/MakerNode/wiki/connman:-wifi-configuration

https://wireless.wiki.kernel.org/en/users/documentation/connman

https://software.intel.com/en-us/blogs/2014/04/25/wireless-galileo-on-yocto-linux-iot-devkit-image

https://01.org/connman/documentation

wpa_supplicant

https://blog.nelhage.com/2008/08/using-wpa_supplicant-on-debianubuntu/

https://together.jolla.com/question/56437/i-would-like-to-toggle-internet-connectivity-via-terminal-with-dbus/

copy from https://together.jolla.com/question/56437/i-would-like-to-toggle-internet-connectivity-via-terminal-with-dbus/

For wifi:

Turn off:

/bin/dbus-send --print-reply --type=method_call --system --dest=net.connman /net/connman/technology/wifi net.connman.Technology.SetProperty string:Powered variant:boolean:false

Turn on:

/bin/dbus-send --print-reply --type=method_call --system --dest=net.connman /net/connman/technology/wifi net.connman.Technology.SetProperty string:Powered variant:boolean:true

For cellular:

(complex method but not sure what happens if you disable the technology.) First you need to find the service:

/bin/dbus-send --system --type=method_call --print-reply --dest=net.connman / net.connman.Manager.GetServices

Its service path will be something with cellular_<lots_of_numbers>_context1</lots_of_numbers>

/bin/dbus-send --system --type=method_call --print-reply --dest=net.connman /net/connman/service/cellular_<blah>_<blah> net.connman.Service.Disconnect

And same with Connect if you want it to reconnect

Otherwise:

off:

/bin/dbus-send --print-reply --type=method_call --system --dest=net.connman /net/connman/technology/cellular net.connman.Technology.SetProperty string:Powered variant:boolean:false

on:

/bin/dbus-send --print-reply --type=method_call --system --dest=net.connman /net/connman/technology/cellular net.connman.Technology.SetProperty string:Powered variant:boolean:false

There should also be a connman tool to make things easier.

http://linuxcommando.blogspot.com/2013/10/how-to-connect-to-wpawpa2-wifi-network.html
http://w1.fi/gitweb/gitweb.cgi?p=hostap.git;a=blob_plain;f=wpa_supplicant/README

 IP Address Management

http://linux-ip.net/html/tools-ip-management.html
ip link
http://linoxide.com/linux-command/use-ip-command-linux/

ifconfig
http://linoxide.com/linux-command/use-ip-command-linux/
                                                                                       

Android
http://osxr.org/android/source/external/iproute2/ip/ipaddress.c

  wpa_supplicant

+ wpa_action

+ wpa_cli

+ wpa_supplicant

wpa_gui

is a graphical frontend program for interacting with wpa_supplicant.


wpa_supplicant

is a daemon that can connect to a password protected wireless access point.


wpa_passphrase

takes an SSID and a password and generates a simple configuration that wpa_supplicant can understand.


wpa_cli

is a command line interface used to control a running wpa_supplicant daemon.

command line
http://processors.wiki.ti.com/index.php/Connect_to_Secure_AP_using_WPA_Supplicant

Connect to secured network - WPA2

• make sure WPA supplicant is running that is "wpa_supplicant -d -Dnl80211 -c/etc/wpa_supplicant.conf -iwlan0 -B" was called before (should be called only once)
• replace “ssid” value with the SSID of a real wireless network you want to connect to.
• replace pre-shared key argument (psk) with more appropriate one.

wpa_cli -iwlan0 disconnect
for i in `wpa_cli -iwlan0 list_networks | grep ^[0-9] | cut -f1`; do wpa_cli -iwlan0 remove_network $i; done
wpa_cli -iwlan0 add_network
wpa_cli -iwlan0 set_network 0 auth_alg OPEN
wpa_cli -iwlan0 set_network 0 key_mgmt WPA-PSK
wpa_cli -iwlan0 set_network 0 psk '"12345678"'
wpa_cli -iwlan0 set_network 0 proto RSN
wpa_cli -iwlan0 set_network 0 mode 0
wpa_cli -iwlan0 set_network 0 ssid '"Matterhorn"'
wpa_cli -iwlan0 select_network 0
wpa_cli -iwlan0 enable_network 0
wpa_cli -iwlan0 reassociate
wpa_cli -iwlan0 status
iw wlan0 link

change default

ip route replace default via 1.2.3.4

Where 1.2.3.4 is the new gateway IP

                                                                                             

Default gateWay

http://stackoverflow.com/questions/23085876/a-simple-example-of-finding-default-gateway-by-getadaptersinfo

http://stackoverflow.com/questions/15118527/how-to-read-windows-default-gateway-ip-address-in-c

http://w3facility.org/question/how-to-read-windows-default-gateway-ip-address-in-c/

http://serverfault.com/questions/356165/forwarding-traffic-from-tun-device-c-backend-to-the-default-gateway

                 Thong LT