How to secure wi-fi network?

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wireless networking (wi-fi) has made easy to use internet from on your computers, smartphones, and other devices.

With traditional wired networks, it is extremely difficult for someone to steal your bandwidth but the big problem with wireless signals is that others can access the Internet using your broadband connection even while they near to your router. This action is also known as piggybacking.
> Piggybacking is bad for mainly three reasons :
  1. It will increase your monthly Internet bill.
  2. It will decrease your Internet access speed.
  3. It can create a security hazard as others may hack your computers and access your personal files through your own wireless network.
What do the bad guys use by this action?
A. There have been quite a few instances where innocent Internet users have been arrested for sending hate emails when in reality, their email accounts where hacked though the unsecured Wi-Fi networks that they had at home. wireshark is a free packet sniffing tool for Linux, Mac and Windows that can scan traffic flowing though a wireless network including cookies, forms and other HTTP requests.


How to secure your wireless network?
A. It is easy to make your wireless network secure, which will both prevent others from stealing your internet and will also prevent hackers from using of your computer through your own network. 
If you follow few steps that you should to secure your wireless network:


  • Step-1: access your wireless router settings. This is different for each router, so check your router user manual.
  • Step-2: once you have logged into your router, the first thing you should do is change the default password of the router. You can change the password from Administration settings on your router settings page.
What do the bad guys use by this action?
A. This is a public database of default usernames and passwords of wireless routers, modems, and other networking devices. For instance, anyone can easily make out from the database that the factory default settings for Linksys device can be accessed by using admin for both username and password fields.

  • Step-3: change your network SSID or wireless network name of your wireless router is usually pre-defined as "default" or brand name of your router. Changing the SSID name of your network is a good idea as it will make it more obvious for others to know which network they are connected to.
What do the bad guys use by this action?
A. They use Wi-Fi scanning tools like inssider(windows) and kismet(Mac and Linux) are free and they allow anyone to find all the available wireless networks in an area even if the routers are not broadcasting their SSID name.
  • Step-4: By enabling network encryption you will be prevent other computers in the area from using your internet connection, you need to encrypt your wireless signals. There so many encryption methods for wireless network settings, including WEP, WPA and WPA2. To enable the encryption on your wireless network.
First: open the wireless security settings on your router configuration page.
Second: select the security method as you wish.
Third: Enter the paraphrase to access the network. Make sure to set this to something that would be difficult to guess and use combination of letters, numbers and special characters in the paraphrase.

What do the bad guys use by this action?
A. Aircrack and coWpAtty are some free tools that allow anyone to crack the WEP/WPA(psk) keys using dictionary or brute force techniques.
  • Step-5: Filter MAC addresses, if you have laptop or any Wi-Fi enabled devices have a unique MAC address just like every computer connected to the internet with unique IP address. For an added layer of protection, you can add the MAC address of all your devices to your wireless router settings so that only the specified devices can connect to your Wi-Fi network. MAC addresses are hard-coded into your networking equipments, so one Mac address will only let that one device on the network. It is unfortunately possible to spoof a MAC address, but an hackerust first know one of the MAC address of the computer that are connected to your wireless network before he can attempt spoofing. To enable MAC address filtering, first make a list of all your hardware devices that you want to connect to your wireless network. Find their MAC address, and then add them into the MAC address filtering in your router administration settings. You can find the MAC address for your computer by opening command prompt and type "ipconfig/all", this shows your MAC address beside the name "physical address". You can find the MAC addresses of mobile phones and other portable devices under their network settings, this will vary for each device.
What do the bad guys use by this action?
A. Someone can change the MAC address of their computer and they connect easily connect to your network since your network allows connection from devices that have that particular MAC address of your device wireless using a sniffing tool like "Nmap" and he can change the MAC address of his own computer by using"MAC-shift".( It is also a free tool)
  • Step-6: reduce the range of your wireless signals, if your are staying in a small area. You can change mode of signal range to 802.11g or use different wireless channel. You can also try placing the router in closed area or wrap a foil around the router antennas.
  • Step-7: check the firmware version of your router is the latest firmware version or not.



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