Libpcap is a portable packet capture library which is used in many packet sniffers, including tcpdump.
Changes: Added testing system to libpcap, independent of tcpdump. Changes to how pcap_t is activated. Adding support for Large stream buffers on Endace DAG cards. Changes to BSD 3-clause license to 2-clause licence. Additions to TCP header parsing, per RFC3168. Dozens of other changes and improvements.