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Working with captured packets
122
As you might have noticed, only packets of the TCP protocol are displayed now (e.g. packets 1-10
are hidden). The packet numbering will remain as before, so the first packet shown is now packet
number 11.
Note
When using a display filter, all packets remain in the capture file. The display filter only
changes the display of the capture file but not its content!
You can filter on any protocol that Wireshark understands. You can also filter on any field that a
dissector adds to the tree view, but only if the dissector has added an abbreviation for the field. A
list of such fields is available in Wireshark in the Add Expression… dialog box. You can find more
information on the Add Expression… dialog box in Section 6.5, “The “Filter Expression” dialog box”.
For example, to narrow the packet list pane down to only those packets to or from the IP address
192.168.0.1, use ip.addr==192.168.0.1.
Note
To remove the filter, click on the Clear button to the right of the filter field.
6.4. Building display filter expressions
Wireshark provides a simple but powerful display filter language that allows you to build quite
complex filter expressions. You can compare values in packets as well as combine expressions into
more specific expressions. The following sections provide more information on doing this.
Tip
You will find a lot of Display Filter examples at the Wireshark Wiki Display Filter page
at wireshark-wiki-display-filter:[wireshark-wiki-display-filter:[]].
6.4.1. Display filter fields
Every field in the packet details pane can be used as a filter string, this will result in showing only
the packets where this field exists. For example: the filter string: tcp will show all packets containing
the tcp protocol.
There is a complete list of all filter fields available through the menu item Help → Supported Protocols
in the page “Display Filter Fields” of the “Supported Protocols” dialog.
6.4.2. Comparing values
You can build display filters that compare values using a number of different comparison operators.
They are shown in Table 6.4, “Display Filter comparison operators”.
Tip
You can use English and C-like terms in the same way, they can even be mixed in a
filter string.
Table 6.4. Display Filter comparison operators
English C-like Description and example
eq == Equal. ip.src==10.0.0.5
- Wireshark User’s Guide 1
- 1. Foreword 8
- 3. Acknowledgements 8
- 4. About this document 9
- Chapter 1. Introduction 10
- Introduction 11
- 1.2. System Requirements 12
- 1.2.1. Microsoft Windows 13
- 1.2.2. UNIX / Linux 13
- 1.3. Where to get Wireshark 14
- Wireshark 14
- 1.6.1. Website 15
- 1.6.2. Wiki 15
- 1.6.3. Q&A Site 15
- 1.6.4. FAQ 15
- 1.6.5. Mailing Lists 16
- 1.6.6. Reporting Problems 16
- 2.3.2. Additional Tasks 19
- 2.3.3. Install Location 19
- 2.3.4. Installing WinPcap 19
- 2.3.7. Update Wireshark 20
- 2.3.8. Update WinPcap 20
- 2.3.9. Uninstall Wireshark 20
- 2.3.10. Uninstall WinPcap 21
- Capturing requires privileges 22
- Chapter 3. User Interface 24
- Figure 3.1. The Main window 25
- 3.3.1. Main Window Navigation 26
- 3.4. The Menu 27
- 3.5. The “File” menu 28
- Figure 3.3. The “File” Menu 29
- Table 3.2. File menu items 30
- 3.6. The “Edit” menu 32
- Figure 3.4. The “Edit” Menu 33
- Table 3.3. Edit menu items 34
- 3.7. The “View” menu 35
- Figure 3.5. The “View” Menu 36
- Table 3.4. View menu items 37
- 3.8. The “Go” menu 40
- Figure 3.6. The “Go” Menu 41
- 3.9. The “Capture” menu 42
- User Interface 43
- 3.10. The “Analyze” menu 44
- Table 3.7. Analyze menu items 46
- 3.11. The “Statistics” menu 47
- 3.12. The “Telephony” menu 50
- 3.13. The “Tools” menu 52
- Figure 3.11. The “Tools” Menu 53
- 3.14. The “Internals” menu 54
- 3.15. The “Help” menu 56
- Figure 3.13. The “Help” Menu 57
- 3.16. The “Main” toolbar 58
- 3.17. The “Filter” toolbar 62
- 3.18. The “Packet List” pane 63
- 3.20. The “Packet Bytes” pane 65
- 3.21. The Statusbar 65
- 4.1. Introduction 68
- 4.2. Prerequisites 68
- 4.3. Start Capturing 68
- $ wireshark -i eth0 -k 69
- Capturing Live Network Data 71
- 4.5.1. Capture frame 73
- 4.5.2. Capture File(s) frame 74
- 4.5.3. Stop Capture… frame 74
- 4.5.4. Display Options frame 74
- 4.5.5. Name Resolution frame 75
- 4.5.6. Buttons 75
- 4.8.1. Add or remove pipes 80
- Microsoft Windows only 82
- 4.12. Link-layer header type 87
- Printing 92
- 5.2.2. Input File Formats 94
- 5.3. Saving captured packets 96
- 5.4. Merging capture files 98
- 5.5. Import hex dump 100
- 5.6. File Sets 103
- 5.7. Exporting data 105
- File" dialog box 108
- 5.8. Printing packets 114
- 5.9. The “Packet Range” frame 115
- 5.10. The Packet Format frame 116
- 6.2. Pop-up menus 120
- Working with captured packets 121
- 6.4.1. Display filter fields 131
- 6.4.2. Comparing values 131
- 6.4.3. Combining expressions 133
- 6.4.4. A common mistake 134
- 6.8. Finding packets 138
- 6.9. Go to a specific packet 139
- 6.10. Marking packets 140
- 6.11. Ignoring packets 140
- Chapter 7. Advanced Topics 143
- Advanced Topics 144
- 7.3. Expert Information 145
- 7.3.1.1. Severity 146
- 7.3.1.2. Group 146
- 7.3.1.3. Protocol 146
- 7.3.1.4. Summary 146
- 7.3.2. “Expert Info” dialog 147
- 7.4. Time Stamps 149
- 7.5. Time Zones 150
- 7.6. Packet Reassembly 153
- 7.7. Name Resolution 154
- 7.8. Checksums 155
- 7.8.2. Checksum offloading 156
- Chapter 8. Statistics 158
- Statistics 159
- Protocol hierarchy columns 161
- 8.4. Conversations 162
- 8.5. Endpoints 163
- 8.7. Service Response Time 166
- 8.9. WLAN Traffic Statistics 170
- Chapter 9. Telephony 172
- 9.3. VoIP Calls 174
- Telephony 176
- 10.1. Introduction 177
- 10.3. Packet colorization 183
- Customizing Wireshark 184
- The first match wins 185
- 10.5. Preferences 190
- 10.5.1. Interface Options 192
- 10.6. Configuration Profiles 193
- 10.7. User Table 195
- 10.8. Display Filter Macros 195
- 10.9. ESS Category Attributes 195
- 10.10. GeoIP Database Paths 195
- 10.11. IKEv2 decryption table 196
- 10.12. Object Identifiers 196
- 10.14. SCCP users Table 197
- 10.18. SNMP users Table 198
- A.1. Packet List Messages 200
- A.2. Packet Details Messages 200
- Wireshark Messages 201
- Appendix B. Files and Folders 202
- Windows folders 204
- Unix/Linux folders 204
- File contents 204
- B.3. Windows folders 208
- D.1. Introduction 211
- Related command line tools 214
- This Document’s License (GPL) 225
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