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Finding Specific Parts of Packets with Tcpdump, Tethereal, and Snort
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Suppose you wanted to find all TCP packets with only the SYN flag set With Tcpdump, you'd have to know where in the TCP header to look (Appendix A contains a protocol reference for this purpose) Tcpdump starts counting bytes of header information at byte 0, so the 13th byte contains the TCP flags, as shown here
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IANA maintains a page on the TCP headers at http://wwwianaorg/assignments/tcp-header-flags
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If only the SYN flag is set in byte 13, the byte will have the following binary values
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This 00000010 binary value is the same as decimal 2 We can write a special BPF to look at this particular bit inside byte 13 We search for packets to or from 192168605, as shown here
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bourque# tcpdump -n -r sf1lpc -c 10 'tcp[13] == 2' and host 192168605 1 15:20:07982850 1722720458173 > 19216860521: S 411816905:411816905(0) win 2048 2 15:20:07982889 1722720458173 > 19216860522: S 411816905:411816905(0) win 2048 3 15:20:21121740 1722720441197 > 19216860522: S 9884012:9884012(0) win 4096 4 15:20:21121764 1722720441197 > 19216860524: S 9884012:9884012(0) win 4096 truncated
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Purpose: Graphical packet capture and analysis utility Author: Originally Gerald Combs, with many contributors Internet site: http://wwwetherealcom FreeBSD installation: Installed via /usr/ports/net/ethereal Version demonstrated: 0100, not version 0914 packaged with FreeBSD 49 RELEASE because that version has security flaws listed at http://wwwetherealcom/appnotes/ We conclude this chapter on full content tools by discussing one of the greatest open source networking tools available: Ethereal Detail-oriented readers probably observed that most of the Ethereal screenshots that appear in this book were made using the Windows version of Ethereal This is proof that UNIX can serve as the ultimate capture platform, while Windows can act as an adequate analysis platform With an entire book on Ethereal already on the shelves, I will lay out the essentials for how I use Ethereal to analyze full content data I turn to Ethereal when I need to quickly browse through a subset of packets I never load a trace file bigger than a few megabytes As we'll see in forthcoming chapters, there are better techniques for analyzing traffic than taking a packet-by-packet approach Ethereal's strength lies in its decoding ability and its potential for rapid visual comparisons When hundreds or thousands of megabytes of packets need to be understood, turn to session data as explained in 7
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[16] [16]
Ethereal Packet Sniffing by Angela Orebaugh et al (Rockland, MA: Syngress, 2004)
Basic Usage of Ethereal
Ethereal can capture packets in real time by using the Capture Options window shown in Figure 51 (To access this window, select the Capture Start menu item)
Figure 51 Telling Ethereal to start capturing packets
[View full size image]
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A Note on Commercial Full Content Collection Options
Beyond the open source software discussed in this chapter, certain vendors offer commercial packet capture products These include products from Network Associates, Sandstorm Enterprises, and Niksun These products sport huge hard drives and custom NICs designed to handle high-traffic loads Another option involves deploying probes that support the Remote Monitoring (RMON) Management Information Base (MIB) RMON uses SNMP to transmit statistics, alarms, and even packet captures, hence the mention of RMON in this chapter RMON is an Internet Engineering Task Force (IETF) standard supported by several RFCs, and it still undergoes active development RMON is implemented by two components
[18] [19]
For more information, consult Cisco's documentation at http://wwwciscocom/univercd/cc/td/doc/cisintwk/ito_doc/rmonhtm
[18] [19]
Visit the RMON IETF site at http://wwwietforg/htmlcharters/rmonmib-charterhtml
An RMON probe watches traffic and generates SNMP messages based on what it sees An RMON collector receives the SNMP messages and interprets the results for analysts
Many routers, such as those made by Cisco, can be configured to generate RMON data Cisco's documentation claims this sort of data collection puts an unnecessary strain on its products, especially when in packet capture mode Routers were designed to pass packets, not capture and forward them via SNMP Some vendors deploy probes dedicated to generate RMON data and consoles to interpret that data I do not cover RMON-based full content data collection because no open source RMON probe exists at the time of writing this chapter A search for "RMON" at SourceForgenet yielded several projects to develop open source RMON probes, but none have released any software I know of at least several financial institutions that use RMON probes to collect full content data on an irregular basis Given the lack of open source solutions, from the standpoint of both probes and interfaces, I recommend avoiding RMON as a primary full content data capture solution