Snort - the de facto standard for intrusion detection/prevention
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5.16 How can I examine logged packets in more detail?

If you are using unified logging, you can use Barnyard (see FAQ [*]) or the unified log to pcap converter written by Dragos:

http://dragos.com/logtopcap.c

You can then get additional decoding of the packet contents by analyzing these pcap files with either:

  • Tcpdump - http://www.tcpdump.org
  • Ethereal - http://www.ethereal.com