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Conclusion
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This book has covered a lot of ground, ranging from NSM theory to tools and techniques for analyzing traffic, and finishing with a look at the way intruders attack NSM operations There's plenty more to discuss, perhaps in a second edition Topics like IP version 6, wireless detection, inline attack modification and denial, application proxies, and network-based forensics are potential candidates for additional material Marty Roesch announced at a recent security conference that he plans to enable Snort to operate inline natively, meaning it could be used as an "intrusion prevention system" to inspect and drop traffic it considers malicious While this capability requires deployment in bridging mode, it could change the way many organizations approach the network monitoring problem
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The new Snort inline capability will use the same ideas but not the same code as the existing Snort inline project at http://snort-inlinesourceforgenet
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By now you should realize that traditional intrusion detection techniques are not delivering the value promised by vendors and most security pundits Developers try to devise ever more accurate detection methods, while intruders code ever craftier exploits and covert channels Intruders have the upper hand, relying on novelty, encryption, and other tricks to evade alert-focused intrusion detection products In such a hostile, unpredictable environment, one must accept that intrusions are inevitable and immediate detection is unlikely Detection techniques that view the alert as the end goal are doomed to failure, especially when the IDS is fooled and fails to generate an alert A majority of the intrusion detection community is happy to deliver alert data to analysts, without considering the importance of information needed to validate and escalate potential intrusions Most IDS interfaces are Web-based alert browsers, with little capability for dynamic investigations The alert data they provide is a dead end When an analyst needs to know more, the IDS has nothing else to offer NSM seeks to change this state of affairs by treating alert data as indicators NSM sees an alert as the beginning of the investigative process, not the conclusion Only by achieving true network awareness and recording and interpreting relevant traffic can an analyst hope to track advanced intruders I hope you've enjoyed the book, and I welcome your comments Good luck detecting and responding to intrusions!
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Part VI: Appendixes
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Appendix A Protocol Header Reference
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The protocol headers presented in this appendix are frequently encountered when analyzing TCP/IP traffic An excellent online reference not mentioned elsewhere is the Network Sorcery site (http://wwwnetworksorcerycom) This site clearly breaks down protocols by network, transport, and application layers by noting the following Network-layer protocols are assigned EtherTypes, like 0x0806 for ARP, 0x0800 for IP version 4, and 0x86DD for IP version 6 Transport-layer protocols are assigned IP protocol values, like 1 for ICMP, 6 for TCP, 17 for UDP, 132 for Stream Control Transmission Protocol (SCTP), and so on Application-layer protocols are assigned one or more SCTP, TCP, or UDP port numbers, like 23 for Telnet, 80 for HTTP, and so on
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Most people argue about what protocols do and forget how they are carried I like the way Network Sorcery cuts through this issue Besides describing all of these protocols and showing their header formats, Network Sorcery also links to the RFCs defining their operation This appendix is designed to be an easy-to-use reference for commonly seen TCP/IP headers I spend a great deal of time explaining TCP sequence numbers, as these are frequently misunderstood The majority of this appendix displays header formats and Ethereal screen captures for rapid reference For detailed understaning of each protocol, refer to the networking texts mentioned in the Preface and 13
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Ethernet Frames
Ethernet is a layer 2 protocol for transmitting frames The Ethernet standard encompasses four types: Ethernet II, IEEE 8023, Sub-Network Access Protocol, and Novell Raw I recommend the networking books mentioned in the Preface and 13, or Section 4 of the compdcomlansethernet FAQ at http://wwwnetworkuptimecom/faqs/ethernet/ for a thorough discussion of each type In this appendix I ignore the Novell Raw format because I hardly ever encounter it, and it is well documented in the references Not shown but present in every Ethernet frame is a 7-byte preamble of alternating 0s and 1s This sequence allows the receiving Ethernet NIC to synchronize with the beginning of the frame An eighth byte consisting of the sequence 10101011 is called the start frame delimiter, which indicates that a frame follows These 8 bytes are typically not shown in open source protocol analyzers Furthermore, each frame ends with a 4-byte frame check sequence (FCS), also not displayed by most protocol analyzers Throughout the book I advocate a capture snaplen value of 1,514 bytes This applies to the destination media access control (MAC) address through the last possible byte of data Such a snaplen value will not capture the FCS, although many protocol analyzers won't see it anyway The minimum length for an Ethernet frame is 64 bytes Figure A1 shows an Ethereal screen capture of a sample Ethernet II frame, which in this case is carrying an ARP request The 14 bytes of the Ethernet frame are highlighted