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Using Ethereal - Packet Capturing & Analysis Tool

Using Ethereal - Packet Capturing & Analysis Tool. 2006. 4. 12 Sungkyunkwan University UTRI 2006710998 Park Aehui. Contents. What is Ethereal? Installing Ethereal under Windows Using Ethereal Tool Packet Capturing Packet Filtering Ethereal Basic Interface Main window Filter toolbar

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Using Ethereal - Packet Capturing & Analysis Tool

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  1. Using Ethereal - Packet Capturing & Analysis Tool 2006. 4. 12 Sungkyunkwan University UTRI 2006710998 Park Aehui

  2. Contents • What is Ethereal? • Installing Ethereal • under Windows • Using Ethereal Tool • Packet Capturing • Packet Filtering • Ethereal Basic Interface • Main window • Filter toolbar • Packet List pane • Packet Detail pane • Packet Byte Pane • Menu • Making use of Ethereal • Reference

  3. What is Ethereal? (cont’d) • Network packet analyzer • Capture network packet • Display that packet as detailed as possible • an open source software project / GPL(GNU General Public License) • Principal Purpose • To troubleshoot network problems • To examine security problems • To debug protocol implementations • To learn network protocol internals • Features • Available for UNIX and Windows • Capture live packet data from a network interface • Open and Save packet data • Filter packets • So on..

  4. What is Ethereal? • Platforms Ethereal runs on • Unix • Apple Mac OS X, BeOS, FreeBSD, HP-UX, IBM AIX, NetBSD, OpenBSD, SCO UnixWare/OpenUnix, SGI Irix, Sun Solaris/Intel, Sun Solaris/Sparc, Tru64 UNIX • Linux • Debian GNU/Linux, Gentoo Linux, IBM S/390 Linux, Mandrake Linux, PLD Linux, Red Hat Linux, Rock Linux, Slackware Linux, Suse Linux • Microsoft Windows • Window Server 2003 / XP / 2000 / NT4.0 , Window ME / 98

  5. Installing Ethereal under Windows (Cont’d) • Install Ethereal • Download a binary installer • http://www.ethereal.com/download.html#release • Since Ethereal Version 0.10.12, the WinPcap installer has become part of the main Ethereal installer • If you need, Install WinPcap • To Capture live network traffic • Can go up to Application from low packet • http://winpcap.polito.it • Linux version - libpcap

  6. Installing Ethereal under Windows

  7. Packet Capturing

  8. Packet Filtering (Cont’d) • How to Use Filtering • Capture Options -> Capture Filter Dialog • Main Toolbar • Filter Edit Box • Filter Button -> Display Filter Dialog • Using the libpcap filter language for capture filter • Example • Src host 10.10.10.1 • ip.addr == 10.0.0.5 or http • Basic Filtering expression • Logical Operations

  9. Packet Filtering (Cont’d) • Basic Filtering expression • Display Filter comparison operators • Display Filter Types • Unsigned integer ex) ip.len le 1500, ip.len le 0x436 • Boolean ex) tcp.flag.syn • Ethernet address(6byte) ex) eth.addr == ff:ff:ff:ff:ff:ff • IPv4 address ex) ip.addr == 192.168.0.1 • Signed integer • String …

  10. Packet Filtering • Capture Filter Example

  11. menu main toolbar filter toolbar packet list pane Packet detail pane Packet Byte Pane Statusbar The Main window • After some packets captured or loaded

  12. Filter toolbar • Quickly edit and apply display filters • Filter • Bring up the filter construction dialog • Expression.. • Open a dialog box that lets you edit a display filter from a list of protocol fields • Clear • Reset the current display filter and clears the edit area • Apply • Apply the current value in the edit area as the new display filter

  13. The Packet List pane • Display all the packets in the current capture file • Each line in the packet list corresponds to one packet • default columns • No • The number of the packet in the capture file • Time • The timestamp of the packet ( presentation format can be changed) • Source • The address where this packet is coming from • Destination • The address where this packet is going to • Protocol • Info

  14. The Packet Detail pane • Show the current packet (selected in the “Packet List”) in a more detailed form • Show the protocols protocol fields • Display using a tree (expand / collapsed)

  15. The Packet Byte Pane • Show the current packet (selected in the “Packet List”) in a hexdump style • Contain data picketed from multiple packets • Packet Reassembling • ex) large chunks of data

  16. The Menu (Cont’d) • File • Open • Open Recent • Marge… • Save • Save As.. • File Set • Export • as “Plan Text” file… • as “PostScript” file… • as “CVS” (Comma Separated Values packet summary) file… • as XML-”PSML”(packet summary) file… • as XML-”PDML”(packet details) file… • Print • Quit

  17. The Menu (Cont’d) • Edit • Find Packet • Find a packet by many criteria • ex) source address find : ip.addr==203.252.50.24 • Find Next • Find Previous • Time Reference • Mark Packet (toggle) • Mark currently selected packet • Mark All Packets • Unmark All Packets • Preferences… • Set preferences for many parameters • User Interface – Layout / Columns / Font / Color • Capture • Printing • Name Resolution • Protocols

  18. The Menu (Cont’d) • View • Setting show or hide • Setting view format

  19. The Menu (Cont’d) • Go • Back • Jump to the recently visited packet in the packet history • Forward • Jump to the next visited packet in the packet history • Go to Packet • specify a packet number, then go to the packet • Go to Corresponding Packet • If the selected field doesn’t correspond to a packet, the item is grey out • First Packet • Jump to first packet of the capture file • Last Packet • Jump to last packet of the capture file

  20. The number of packets captured, Since this dialog was open Number of packets captured In the last second Open the Capture Options The Menu (Cont’d) • Capture (1) • Interface • Showing live captured data • The interface description provided by the operation system

  21. select interface to capture Buffer size to be used while capturing specify the maximum amount default : 65535 Display option while capturing file name to save Stop capture after n packet(s) / n megabytes / n minutes(s) The Menu (Cont’d) • Capture (2) • Options

  22. The Menu (Cont’d) • Analyze • Display Filter • Bring up a dialog of display filters • Apply as Filter • Change the current display filter and changed filter immediately • Prepare a Filter • Change the current display filter but won’t apply the change filter • Enabled Protocol.. • Enable/disable protocol dissectors • Decode As.. / User Specified Decodes… • To decode certain packets as a particular protocol • Follow TCP Stream • Expert Info • Expert Info Composite

  23. The Menu • Statistics • Summery • Show information about the data captured • Protocol History • Display a hierarchical tree of protocol statistics • Conversations • Display a list of conversations (traffic between endpoints) • Endpoint List • Display a list of endpoints (traffic to/from an address) • TCP Stream Graph • Round Trip Time Graph • Throughput Graph

  24. Making use of Ethereal (Cont’d) • Analyzing web page (HTTP) packets (1) • web page : http://www.skku.ac.kr (203.252.32.90:80)

  25. Making use of Ethereal (Cont’d) • Analyzing web page (HTTP) packets (2) • Packet Summary

  26. “Get” Request “Post” Response Making use of Ethereal • Analyzing web page (HTTP) packets (3) • Contents

  27. Reference • http://www.ethereal.com/ • http://ethereal.secuwiz.com/docs/eug_html/ • http://www.infoage.co.kr/newspaper/list.php • http://blog.naver.com/blueysh98/100012090262

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