Sniffing the network using Wireshark

The illustration below shows you the steps that you will carry out to complete this exercise without confusion

Open Wireshark
You will get the following screen



  • Select the network interface you want to sniff. Note for this demonstration, we are using a wireless network connection. If you are on a local area network, then you should select the local area network interface.
  • Click on start button as shown above



  • Click on submit button
  • A successful logon should give you the following dashboard


  • You should be able to view the plaintext values of all the POST variables submitted to the server via HTTP protocol.
What is a MAC Flooding?
MAC flooding is a network sniffing technique that floods the switch MAC table with fake MAC addresses. This leads to overloading the switch memory and makes it act as a hub. Once the switch has been compromised, it sends the broadcast messages to all computers on a network. This makes it possible to sniff data packets as they sent on the network.
Counter Measures against MAC flooding
  • Some switches have the port security feature. This feature can be used to limit the number of MAC addresses on the ports. It can also be used to maintain a secure MAC address table in addition to the one provided by the switch.
  • Authentication, Authorization and Accounting servers can be used to filter discovered MAC addresses.
Sniffing Counter Measures
  • Restriction to network physical media highly reduces the chances of a network sniffer been installed
  • Encrypting messages as they are transmitted over the network greatly reduces their value as they are difficult to decrypt.
  • Changing the network to a Secure Shell (SSH)network also reduces the chances of the network been sniffed.

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