Description:

The Network Library provides a simple API for commonly used low-level
network functions (mainly packet injection). Using libnet, it is easy
to build and write arbitrary network packets. It provides a portable
framework for low-level network packet writing and handling (use
libnet in conjunction with libpcap and you can write some really cool
stuff). Libnet includes packet creation at the IP layer and at the
link layer as well as a host of supplementary and complementary
functionality.