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My question is:
How to captuare an incoming IP packet from a network interface, change its content and resend it from another network interface?
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What is done to an IP packet before it is transmitted over the physical medium? It is tagged with information guaranteeing reliable delivery. It is segmented into smaller individual pieces. It is encapsulated into a TCP segment.
An IP address is the location of a resource. For example a sending or receiving computer would have an IP address, which lets other computers know where this computer is located. An IP packet contains some information, which allows these different machines to send data to each other.
A network packet is divided into three parts; the header, payload, and trailer, each containing values that are characteristic of it.
Each IP packet contains both a header (20 or 24 bytes long) and data (variable length). The header includes the IP addresses of the source and destination, plus other fields that help to route the packet. The data is the actual content, such as a string of letters or part of a webpage.
The choice is yours, there is no preference (and hence no "normal").
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