what is the structure of an ip packet
IPv4 An IP packet consists of a header section and a data section.
Computer network The most striking example of an overlay network is the Internet itself. The Internet itself was initially built as an overlay on the telephone network.[18] Even today, each Internet node can communicate with virtually any other through an underlying mesh of sub-networks of wildly different topologies and technologies. Address resolution and routing are the means that allow mapping of a fully connected IP overlay network to its underlying network.