Cocoa Packet Analyzer is a native Mac OS X implementation of a network protocol analyzer and packet sniffer. It is able to do basic network capturing, filter packets, analyze and display pcap files. CPA uses libPCAP for reading packet trace files and for capturing network traffic (filter expressions from tcpdump may be used).

Supported Types and Protocols:

• Ethertype ARP
• Ethertype IP (v4/ v6)
• Ethertype PPP
• Ethertype PPPoED/S
• 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)
  

Screenshots:
Overview
Capturing
Preferences
RADIUS details
L2TP details
PPP-LCP details
PPP-IPCP details
IPv6 details



Downloads:
Version 0.52
What's new?



Requires:
Mac OS X 10.4 / 10.5

Some plans for 1.0 release:

• More protocols
• Nice name (suggestions?)
• Fancy GUI & icon(s) (wanna help?)
• Localizations
• Scripting
• Printing support