command line to connect wifi in Linux

=============== WPA only ============
step 1:
ifconfig wlan0 up
wpa_passphrase yournetworkessid passphrase > /opt/wpa_configure.conf

step 2, vi to edit more info into it:   (vi quick guide: start "vi filename" then press "i" for insert mode, after edit press ESC for cmd mode, type :w to write, :q to quit)
ssid=yournetworkessid
      proto=WPA
      key_mgmt=WPA-PSK
      pairwise=TKIP
      group=TKIP
      psk=f242925f83787084d58101d5eb52485989e2a553983bfe6fc5b8d27fdfa063bd

step 3, connect:
wpa_supplicant -iwlan0 -c/opt/wpa_configure.conf &

step 3, dhcp to get IP:
udhcpc -i wlan0

=============== WEP only =============
Tools to use:
ifconfig: Enable your wireless device.
iwlist: List the available wireless access points.
iwconfig: Configure your wireless connection.
dhclient: Get your IP address via dhcp.


Step 1: enable your wifi device (ifconfig wlan0 down)
ifconfig wlan0 up

Step 2: scan wifi network
iwlist wlan0 scan

Step 3: connect to the wifi (WEP only) network
iwconfig wlan0 essid NETWORK_ID key s:WIRELESS_PASSWORD

Step 4: dhcp to get IP address
udhcpc -i wlan0
OR dhclient wlan0

manual IP, gateway:
ifconfig wlan0 192.168.1.9 netmask 255.255.255.0 up
route add default gw 192.168.1.1

============== to change mac address ========

ifconfig eth0 down hw ether 00:00:00:00:00:01
ifconfig eth0 up

Using IP Sec policy to block a specified IP

Tried on XP & 7:

Start - Run - mmc
File - Add/Remove Snap In
IP Security Policy Management (Local computer)
Right click IP Security Policy...  - Create IP Security Policy
Use a cert from this CA - Any one (Microsoft ...coz the pc is not part of ActiveDirectory)
Add
This rule does not specify a tunnel
All Network connection
Add, Add, A specified IP Address (192.168.1.5)
My IP Address
Make sure you click the radio button "New IP Filter List" in IP filter lists:, Next
Add, Block
Make sure you click the radio button "New Filter Action" in Filter Actions:, Next
Right click the new "New IP Security Policy" - Assign

dead battery in desktop pc (sync pc time)

I knew I should replace it with new one to get its date & time running.
Or run the script every time the pc boots up:


type c:\lastdate | date
echo 08:30:00 | time
w32tm /resync
echo %date% > c:\lastdate





update the windows registry:

Windows Registry Editor Version 5.00
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\W32Time\Config]
"MaxNegPhaseCorrection"=dword:ffffffff
"MaxPosPhaseCorrection"=dword:ffffffff

setup VPN server for windows XP pro

Setup VPN server
-Start
-Control Panel
-Network Connections
-Create New Connection
-Setup An Advanced Connection
-Acept Incoming Connection, Next
-Allow Virtual Private Connection
-choose some users
-Specify TCP/IP addresses: 192.168.0.2 to 192.168.0.200, Allow calling computer to specify its own IP address
-specify (some where, TCP/IP) own IP: 192.168.0.1
-configure your firewall (software & router)

Connect it with windows 7
-Open Network and Sharing Centre
-Setup a new connection or network
-Connect to a workplace (dial-up or VPN connection..)
-No,Create a new connection
-Use my Internet Connection (VPN)


To test:
file sharing \\192.168.0.1
Remote Desktop 192.168.0.1

delete fb account permanently

Mar 2012: If you click Deactivate your account under Account Settings - Security, you only temporary deactivate it. You may login with the same email & password anytime and its content remained.

The following links may permanently delete your account and all its content:

https://ssl.facebook.com/help/contact.php?show_form=delete_account