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Basic Usage of Tcpdump
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Engineers use Tcpdump to capture traffic, and analysts use it to parse and analyze traffic To capture traffic and send the output to the screen (also known as standard out), use this syntax
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tcpdump n i <interface> -s <snaplen> This syntax includes the following switches n tells Tcpdump to not resolve IP addresses to domain names and port numbers to
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Purpose: 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: 0100a, not version 0914 packaged with FreeBSD 49 RELEASE because that version has security flaws listed at http://wwwetherealcom/appnotes/
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Ethereal 0104 was released May 13, 2004, to correct security deficiencies Always run the latest version
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Tethereal is similar to Tcpdump in that it relies on libpcap and can both collect and display traffic captures It's the command-line twin brother of the Ethereal protocol analyzer explained later in this chapter Tethereal is best used in situations where Ethereal is not available, such as examining a large capture file on a remote sensor in a command-line environment While Tcpdump can look at the same traffic, Tethereal's extensive range of protocol decoding options makes understanding certain protocols much easier The program also supports a wider range of collection-friendly options, described next
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Tethereal is invoked to capture packets and send results to standard output in much the same way as Tcpdump
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tethereal n i <interface> -s <snaplen> Tethereal's default snaplen is 65,535 bytes, the maximum possible value allowed by the IP header I recommend specifying 1,515 bytes anyway, as with Tcpdump If you don't know the interfaces available for capture, use Tethereal's D switch, which lists the interfaces for you
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bourque# tethereal -D 1 em0 2 fxp0 3 ngeth0 4 sf1 5 sf2 6 sf3 7 lo0
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Using Tethereal to Store Full Content Data
In its most basic mode, Tethereal can write to a capture file just as Tcpdump does
tethereal n i <interface> -s <snaplen> -w <capfilelpc> Whereas Tcpdump leaves file rotation to the engineer, Tethereal offers several very useful features Combine the a switch, which specifies a maximum capture size or duration, with
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Snort as Packet Logger
Purpose: Packet capture and analysis utility Author: Martin Roesch, lead developer Internet site: http://wwwsnortorg FreeBSD installation: Installed via /usr/ports/net/snort Version demonstrated: 210 Snort is most famous for being a network-based intrusion detection system, but it can also be used to collect and view packets Legend has it that Marty Roesch wrote Snort because he wanted a sniffer that would display packet contents more uniformly than other software available in 1998 By default, Snort's output is fairly different from Tcpdump and Tethereal
Basic Usage of Snort as Packet Logger
If started with the -v switch and told to listen on interface xl0 with i, as shown in the following output, Snort will display traffic to standard output The most notable departure from the output of Tcpdump and Tethereal is Snort's tendency to display certain values in hexadecimal format Watch for that in this section
janney# snort v i xl0 Running in packet dump mode Log directory = /var/log/snort Initializing Network Interface xl0 --== Initializing Snort ==-Initializing Output Plugins! Decoding Ethernet on interface xl0 --== Initialization Complete ==--*> Snort! <*Version 210 (Build 9) By Martin Roesch (roesch@sourcefirecom, wwwsnortorg) 01/05-22:41:23877019 192168502 -> 17227205 ICMP TTL:126 TOS:0x0 ID:60004 IpLen:20 DgmLen:60 Type:8 Code:0 ID:588 Seq:0 ECHO =+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+= 01/05-22:41:23877070 17227205 -> 192168502 ICMP TTL:64 TOS:0x0 ID:40429 IpLen:20 DgmLen:60 Type:0 Code:0 ID:588 Seq:0 ECHO REPLY =+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+= Snort understands BPF syntax just as Tcpdump and Tethereal do You limit the number of packets it collects by using the n switch and use X to dump headers and application data In the following command, we use these two switches and also tell Snort to read five packets to or from port 21 TCP or UDP As was the case with Tethereal, Snort's output has been slightly modified (line numbers were removed) to accommodate page width