Package libpcap

A system-independent interface for user-level packet capture

http://www.tcpdump.org

Libpcap provides a portable framework for low-level network
monitoring. Libpcap can provide network statistics collection,
security monitoring and network debugging. Since almost every system
vendor provides a different interface for packet capture, the libpcap
authors created this system-independent API to ease in porting and to
alleviate the need for several system-dependent packet capture modules
in each application.

Install libpcap if you need to do low-level network traffic monitoring
on your network.

Miscellanea
Name Description
pcap-filter packet filter syntax
pcap-linktype link-layer header types supported by libpcap
pcap-tstamp packet time stamps in libpcap