By default, an NIC ignores all traffic that is not addressed to it, which is done by comparing the destination address of the Ethernet packet with the hardware address (MAC) of the device. The promiscuous mode refers to the unique way of Ethernet hardware, in particular, network interface cards (NICs), that allows an NIC to receive all traffic on the network, even if it is not addressed to this NIC. One can sniff the following sensitive information from a network −Ī sniffer normally turns the NIC of the system to the promiscuous mode so that it listens to all the data transmitted on its segment. In the right conditions and with the right protocols in place, an attacking party may be able to gather information that can be used for further attacks or to cause other issues for the network or system owner. In other words, Sniffing allows you to see all sorts of traffic, both protected and unprotected. Anyone in the same physical location can plug into the network using Ethernet cable or connect wirelessly to that network and sniff the total traffic. There is so much possibility that if a set of enterprise switch ports is open, then one of their employees can sniff the whole traffic of the network. It is also called wiretapping and can be applied to the computer networks. It is a form wherein, we can “tap phone wires” and get to know the conversation. Sniffing or network packet sniffing is the process of monitoring and capturing all the packets passing through a given network using sniffing tools.
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