Difference between revisions of "Wireshark"

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(Capturing as normal user: newgrp does *not* apply newly added groups, it changes the default GID; see Users and groups)
 
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[[Category:Security (English)]][[Category:Networking (English)]]
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[[Category:Security]]
Wireshark is a free and open-source packet analyzer. It is used for network troubleshooting, analysis, software and communications protocol development, and education. Originally named Ethereal, in May 2006 the project was renamed Wireshark due to trademark issues.
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[[Category:Networking]]
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[[fr:Wireshark]]
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[[ja:Wireshark]]
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[[pt:Wireshark]]
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[[ru:Wireshark]]
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[[zh-hans:Wireshark]]
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[https://www.wireshark.org/ Wireshark] is a free and open-source packet analyzer. It is used for network troubleshooting, analysis, software and communications protocol development, and education.
  
 
==Installation==
 
==Installation==
  
The {{Package Official|wireshark}} package has been split into -cli and -gtk versions (the cli package is a dependency of the gtk package).
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[[Install]] the {{pkg|wireshark-qt}} package for the Wireshark GUI or {{pkg|wireshark-cli}} for just the {{ic|tshark}} CLI.
  
To install both the gui and the cli:
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For the deprecated GTK+ interface, install the {{pkg|wireshark-gtk}} package. Note that this package will be removed in the future (Wireshark 3.0).
# pacman -S wireshark-gtk
 
  
To install just the cli:
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== Capturing as normal user ==
# pacman -S wireshark-cli
 
  
==Capturing as normal user==
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Do not run Wireshark as root, it is insecure. Wireshark has implemented privilege separation. [https://wiki.wireshark.org/CaptureSetup/CapturePrivileges#Most_UNIXes]
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The {{Pkg|wireshark-cli}} [[PKGBUILD#install|install script]] sets packet capturing [[capabilities]] on the {{ic|/usr/bin/dumpcap}} executable.
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{{ic|/usr/bin/dumpcap}} can only be executed by root and members of the {{ic|wireshark}} group.
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{{Remove|Duplicates [[Users and groups]].}}
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Therefore to use Wireshark as a normal user you just have to add your user to the {{ic|wireshark}} [[group]]:
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# gpasswd -a ''username'' wireshark
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Re-login to apply the change.
  
* Add yourself to the wireshark group
 
# gpasswd -a "username" wireshark
 
* Log out and log in
 
 
==A few capturing techniques==
 
==A few capturing techniques==
  
There are a number of different ways to capture exactly what you are looking for in Wireshark, by applying filters.
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There are a number of different ways to capture exactly what you are looking for in Wireshark, by applying [https://wiki.wireshark.org/CaptureFilters capture filters] or [https://wiki.wireshark.org/DisplayFilters display filters].
  
{{Note|To learn the filter syntax, see man pcap-filter(7).}}
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{{Note|To learn the capture filter syntax, see {{man|7|pcap-filter}}. For display filters, see {{man|4|wireshark-filter}}.}}
  
 
===Filtering TCP packets===
 
===Filtering TCP packets===
If you want to see all the current TCP packets, type {{ic|tcp}} into the "Filter" bar.
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If you want to see all the current TCP packets, type {{ic|tcp}} into the "Filter" bar or in the CLI, enter:
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$ tshark -f "tcp"
  
 
===Filtering UDP packets===
 
===Filtering UDP packets===
If you want to see all the current UDP packets, type {{ic|udp}} into the "Filter" bar.
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If you want to see all the current UDP packets, type {{ic|udp}} into the "Filter" bar or in the CLI, enter:
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$ tshark -f "udp"
  
 
===Filter packets to a specific IP Address===
 
===Filter packets to a specific IP Address===
* If you would like to see all the traffic going to a specific address, enter {{ic|<nowiki>ip.dst == 1.2.3.4</nowiki>}}, replacing {{ic|1.2.3.4}} with the IP address the outgoing traffic is being sent to.
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* If you would like to see all the traffic going to a specific address, enter display filter {{ic|<nowiki>ip.dst == 1.2.3.4</nowiki>}}, replacing {{ic|1.2.3.4}} with the IP address the outgoing traffic is being sent to.
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* If you would like to see all the incoming traffic for a specific address, enter display filter {{ic|<nowiki>ip.src == 1.2.3.4</nowiki>}}, replacing {{ic|1.2.3.4}} with the IP address the incoming traffic is being sent to.
  
* If you would like to see all the incoming traffic for a specific address, enter {{ic|<nowiki>ip.src == 1.2.3.4</nowiki>}}, replacing {{ic|1.2.3.4}} with the IP address the incoming traffic is being sent to.
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* If you would like to see all the incoming and outgoing traffic for a specific address, enter display filter {{ic|<nowiki>ip.addr == 1.2.3.4</nowiki>}}, replacing {{ic|1.2.3.4}} with the relevant IP address.

Latest revision as of 20:22, 7 August 2018

Wireshark is a free and open-source packet analyzer. It is used for network troubleshooting, analysis, software and communications protocol development, and education.

Installation

Install the wireshark-qt package for the Wireshark GUI or wireshark-cli for just the tshark CLI.

For the deprecated GTK+ interface, install the wireshark-gtk package. Note that this package will be removed in the future (Wireshark 3.0).

Capturing as normal user

Do not run Wireshark as root, it is insecure. Wireshark has implemented privilege separation. [1]

The wireshark-cli install script sets packet capturing capabilities on the /usr/bin/dumpcap executable.

/usr/bin/dumpcap can only be executed by root and members of the wireshark group.

Tango-edit-cut.pngThis section is being considered for removal.Tango-edit-cut.png

Reason: Duplicates Users and groups. (Discuss in Talk:Wireshark#)

Therefore to use Wireshark as a normal user you just have to add your user to the wireshark group:

# gpasswd -a username wireshark

Re-login to apply the change.

A few capturing techniques

There are a number of different ways to capture exactly what you are looking for in Wireshark, by applying capture filters or display filters.

Note: To learn the capture filter syntax, see pcap-filter(7). For display filters, see wireshark-filter(4).

Filtering TCP packets

If you want to see all the current TCP packets, type tcp into the "Filter" bar or in the CLI, enter:

$ tshark -f "tcp"

Filtering UDP packets

If you want to see all the current UDP packets, type udp into the "Filter" bar or in the CLI, enter:

$ tshark -f "udp"

Filter packets to a specific IP Address

  • If you would like to see all the traffic going to a specific address, enter display filter ip.dst == 1.2.3.4, replacing 1.2.3.4 with the IP address the outgoing traffic is being sent to.
  • If you would like to see all the incoming traffic for a specific address, enter display filter ip.src == 1.2.3.4, replacing 1.2.3.4 with the IP address the incoming traffic is being sent to.
  • If you would like to see all the incoming and outgoing traffic for a specific address, enter display filter ip.addr == 1.2.3.4, replacing 1.2.3.4 with the relevant IP address.