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D.3. tcpdump: Capturing with tcpdump for
viewing with Wireshark
There are occasions when you want to capture packets using tcpdump rather than wireshark, espe-
cially when you want to do a remote capture and do not want the network load associated with run-
ning Wireshark remotely (not to mention all the X traffic polluting your capture).
However, the default tcpdump parameters result in a capture file where each packet is truncated,
because tcpdump, by default, does only capture the first 68 bytes of each packet.
To ensure that you capture complete packets, use the following command:
tcpdump -i <interface> -s 1500 -w <some-file>
You will have to specify the correct interface and the name of a file to save into. In addition, you
will have to terminate the capture with ^C when you believe you have captured enough packets.
Note!
tcpdump is not part of the Wireshark distribution. You can get it from: ht-
tp://www.tcpdump.org for various platforms.
Related command line tools
189
- Wireshark User's Guide 1
- Table of Contents 4
- 1. Foreword 8
- 3. Acknowledgements 10
- 4. About this document 11
- #usersguide 12
- Chapter 1. Introduction 15
- 1.1.6. Many protocol decoders 16
- 1.1.7. Open Source Software 16
- 1.1.8. What Wireshark is not 17
- 1.2. System Requirements 18
- 1.2.3. Unix / Linux 19
- 1.3. Where to get Wireshark? 20
- Wireshark 22
- 1.6.1. Website 23
- 1.6.2. Wiki 23
- 1.6.3. FAQ 23
- 1.6.4. Mailing Lists 23
- 1.6.5. Reporting Problems 24
- Introduction 26
- Download all required files! 28
- 2.8.1. Install Wireshark 35
- 2.8.1.4. Command line options 36
- 2.8.3. Update Wireshark 37
- 2.8.4. Update WinPcap 37
- 2.8.5. Uninstall Wireshark 37
- 2.8.6. Uninstall WinPcap 38
- Chapter 3. User Interface 40
- 3.2. Start Wireshark 41
- 3.3. The Main window 42
- 3.3.1. Main Window Navigation 43
- 3.4. The Menu 44
- Table 3.2. File menu items 45
- Table 3.3. Edit menu items 48
- Table 3.4. View menu items 50
- 3.8. The "Go" menu 54
- Table 3.6. Capture menu items 56
- Table 3.7. Analyze menu items 58
- Table 3.9. Help menu items 62
- 3.18. The Statusbar 71
- User Interface 72
- 4.1. Introduction 73
- 4.2. Prerequisites 74
- 4.3. Start Capturing 75
- Capturing Live Network Data 77
- 4.5.1. Capture frame 78
- 4.5.2. Capture File(s) frame 80
- 4.5.3. Stop Capture... frame 80
- 4.5.4. Display Options frame 81
- 4.5.5. Name Resolution frame 81
- 4.5.6. Buttons 81
- 4.7. Link-layer header type 84
- Printing 91
- 5.2. Open capture files 92
- 5.2.2. Input File Formats 94
- 5.3. Saving captured packets 96
- 5.3.2. Output File Formats 98
- 5.4. Merging capture files 100
- 5.5. File Sets 102
- 5.6. Exporting data 104
- File" dialog box 105
- 5.7. Printing packets 110
- 5.8. The Packet Range frame 112
- 5.9. The Packet Format frame 113
- Working with captured packets 116
- 6.2. Pop-up menus 117
- 6.4.1. Display filter fields 124
- 6.4.2. Comparing values 124
- 6.4.3. Combining expressions 125
- 6.4.4. A common mistake 127
- Warning! 130
- 6.7. Finding packets 132
- 6.8. Go to a specific packet 134
- 6.9. Marking packets 135
- Chapter 7. Advanced Topics 139
- 7.2. Following TCP streams 140
- 7.3. Time Stamps 142
- Advanced Topics 143
- 7.4. Time Zones 144
- 7.5. Packet Reassembling 147
- 7.6. Name Resolution 149
- 7.7. Checksums 151
- 7.7.2. Checksum offloading 152
- Chapter 8. Statistics 154
- Statistics 155
- 8.4. Endpoints 159
- 8.5. Conversations 161
- 8.7. Service Response Time 164
- 9.1. Introduction 168
- 9.3. Packet colorization 174
- 9.4.2. User Specified Decodes 179
- 9.5. Preferences 181
- 9.6. User Table 182
- 9.7. Display Filter Macros 183
- 9.9. User DLTs protocol table 185
- 9.10. SNMP users Table 186
- Customizing Wireshark 187
- Appendix A. Files and Folders 188
- • the current display filter 189
- Files and Folders 189
- Windows folders 191
- Unix/Linux folders 191
- A.3. Windows folders 194
- C.1. Packet List Messages 198
- C.2. Packet Details Messages 199
- Wireshark Messages 200
- D.1. Introduction 201
- Related command line tools 202
- CORBA IDL files 215
- D.9.4. TODO 216
- D.9.5. Limitations 217
- D.9.6. Notes 217
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