Cocoa Packet Analyzer is a free and 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.

Supported Types and Protocols:
· Ethertype ARP
· Ethertype IP (v4/ v6)
· Ethertype PPP
· Ethertype PPPoED/S
· Ethertype 802.1Q VLAN
· Linktype Loopback
· Linktype PPP
· IP-Protocol IP
· IP-Protocol TCP
· IP-Protocol UDP
· IP-Protocol ICMP
· IP-Protocol IGMP
· IP-Protocol L2TP
· PPPoE Discovery and Sessionstages
· PPP-Protocols: IP, LCP, IPCP, CCP, PAP, CHAP
· L2TP-Protocol (port based detection)
· RADIUS-Protocol (port based detection)
· SIP-Protocol (third party analyzer plugin)
· ICMPv6 Protocol (third party analyzer plugin)

Here are some key features of "Cocoa Packet Analyzer":

· Packet capturing (NOT available for the Mac App Store version!).
· Analyze, display and filter packet trace files.
· Supports PCAP packet capture format.
· QuickLook plugin to get an overview already in Finder.
· Intel 64-bit CPU support.
· Printing of packets.
· Japanese and German localization.

What's New in This Release: [ read full changelog ]

· fixed small memory leak.
· optimized icons