Cocoa Packet Analyzer is a native Mac OS X implementation of a network protocol analyzer and packet sniffer. CPA supports the industry-standard PCAP packet Capture format for reading, capturing and writing packet trace files.
Features:
Basic packet capturing (libPCAP/ tcpdump filter expressions can be used).
Analyze and display packet trace files.
Supports PCAP packet capture format.
Quicklook plugin included - its basic but at least you can get an overview over packet trace files in finder.
