IP packet related enum and struct definitions are in 

    iptypes/iptypes.h

------------------------------------------------------------------------------

The organization of the program's flow is described in
documentation/README.flow

An annotated example of tcp communication is available in
documentation/README.tcp

Information describing the format of the file written by tcpdump is found in
documentation/README.tcpdump

An annotated example of udp communication and the instructions of how to set
up a demo-udp connection is available in documentation/README.udp

The organization of pcap packets is described in documentation/README.packet

An example of the information made available by the conntrack program for tcp,
udp, and icmp connections is available in documentation/README.conntrack

