A “Packet Sniffer” is a utility that sniffs without modifying the network’s packets in any way.
By comparison, a firewall sees all of a computer’s packet traffic as well, but it has the ability to block and drop any packets that its programming dictates. Packet sniffers merely watch, display, and log this traffic.
One disturbingly powerful aspect of packet sniffers is their ability to place the hosting
machine’s network adapter into “promiscuous mode.” Network adapters running in promiscuous mode receive not only the data directed to the machine hosting the sniffing software, but also ALL of the traffic on the physically connected local network.
In order to view an entire network session you will have to reassemble the packets back into sessions.
To do so you will have to know deeply IP and TCP protocols.
Reassembling the packets is not an easy task because some packets are lost on the way and the others do not come at the right order, but once you do that you are capable to “read” the entire network.
After you have learnt to reassemble packets you will have the ability to...
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