Using ethereal packet capturing analysis tool
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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

Using Ethereal - Packet Capturing & Analysis Tool

2006. 4. 12

Sungkyunkwan University UTRI

2006710998

Park Aehui


Contents

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


What is ethereal cont d

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..


What is ethereal

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


Installing ethereal under windows cont d

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


Installing ethereal under windows

Installing Ethereal under Windows


Packet capturing

Packet Capturing


Packet filtering cont d

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


Packet filtering cont d1

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 …


Packet filtering

Packet Filtering

  • Capture Filter Example


The main window

menu

main toolbar

filter toolbar

packet list pane

Packet detail pane

Packet Byte Pane

Statusbar

The Main window

  • After some packets captured or loaded


Filter toolbar

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


The packet list pane

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


The packet detail pane

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)


The packet byte pane

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


The menu cont d

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


The menu cont d1

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


The menu cont d2

The Menu (Cont’d)

  • View

    • Setting show or hide

    • Setting view format


The menu cont d3

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


The menu cont d4

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


The menu cont d5

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


The menu cont d6

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


The menu

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


Making use of ethereal cont d

Making use of Ethereal (Cont’d)

  • Analyzing web page (HTTP) packets (1)

    • web page : http://www.skku.ac.kr (203.252.32.90:80)


Making use of ethereal cont d1

Making use of Ethereal (Cont’d)

  • Analyzing web page (HTTP) packets (2)

    • Packet Summary


Making use of ethereal

“Get” Request

“Post”

Response

Making use of Ethereal

  • Analyzing web page (HTTP) packets (3)

    • Contents


Reference

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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