libpcap:
libpcap: libpcap is a portable framework for low-level network monitoring.
libpcap: Since almost  every system vendor provides  a different interface
libpcap: for packet capture, and  since we've developed several tools that
libpcap: require this functionality, we've created this system-independent
libpcap: API  to  ease in porting  and  to alleviate  the need for several
libpcap: system-dependent packet capture modules in each application.
libpcap: Written & maintained by The TCPdump team.
libpcap:
