Packet capture technology is widely used in the field of network security. Network intrusion detection systems, protocol analysis software, firewalls, etc. all need to capture packets. This paper studies the packet capture technology under Linux and Windows environments, gives several packet capture methods, and proposes the use of SOCK_PACKET and raw sockets to forward packets. Among them, a programming method for using winpcap and Jpcap to capture packets under Windows is also given. Packet capture refers to capturing packets received by the data link layer. It plays an important role in monitoring the network for us, and can even enable us to monitor our own network like using TCPdump. At the same time, it also provides a method for hackers to eavesdrop on network communications. At present, many network security products, such as network intrusion detection systems, need to use packet capture technology to collect information sources. For gateway programs, it is even more necessary to send packets out, which also involves address and port conversion. Therefore, this paper studies the packet capture technology under Linux and Windows and the packet forwarding technology under Linux.
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