As the name suggests, it creates a spanning tree within a mesh network of connected layer-2 bridges typically Ethernet switchesand disables those links that are not part of the spanning tree, leaving a single active path between any two network nodes. See the graph below containing three commands: Below the juniper router sign in qq are the LOAD values for each interval that would be calculated. It is written through the View:Coloring Juniper router sign in qq dialog. If the selection bar has a "select" behavior, the arrow keys will move the selection bar and change the selection to the new item in the packet list or packet details. A spectrum analyzer can be used to visually illustrate the frequencies in use. Command and SQL shells may also be possible. The created filenames are based on the filename given with the -w flag, the number of the file and on the creation date and time, e.

This dialog will also allow an optional filter string to be used. The Service Response Time is calculated as the time delta between the First packet of the exchange and the Last packet of the exchange. You can apply an optional filter string in a dialog box, before starting the calculation. The statistics will only be calculated on those calls matching that filter. Only those commands that are seen in the capture will have its stats displayed.

The stats will only be calculated on those calls matching that filter. The number of occurrences of each message or reason will be displayed in the second column. This window opened will update in semi-real time to reflect changes when doing live captures or when reading new capture files into Wireshark. You can apply an optional filter string in a dialog box, before starting the counter. Activate a counter for SIP messages. See various information about Wireshark see "About" dialog below , like the version, the folders used, the available plugins, The main window contains the usual things like the menu, some toolbars, the main area and a statusbar.

The main area is split into three panes, you can resize each pane using a "thumb" at the right end of each divider line. The main window is much more flexible than before.

The layout of the main window can be customized by the Layout page in the dialog box popped up by Edit:Preferences , the following will describe the layout with the default settings. Some menu items are available for quick access here. There is no way to customize the items in the toolbar, however the toolbar can be hidden by View:Main Toolbar. A display filter can be entered into the filter toolbar. Selecting the Filter: button lets you choose from a list of named filters that you can optionally save.

Pressing the Return or Enter keys, or selecting the Apply button, will cause the filter to be applied to the current list of packets. Selecting the Reset button clears the display filter so that all packets are displayed again. There is no way to customize the items in the toolbar, however the toolbar can be hidden by View:Filter Toolbar. The top pane contains the list of network packets that you can scroll through and select.

By default, the packet number, packet timestamp, source and destination addresses, protocol, and description are displayed for each packet; the Columns page in the dialog box popped up by Edit:Preferences lets you change this although, unfortunately, you currently have to save the preferences, and exit and restart Wireshark, for those changes to take effect. If you click on the heading for a column, the display will be sorted by that column; clicking on the heading again will reverse the sort order for that column.

An effort is made to display information as high up the protocol stack as possible, e. The middle pane contains a display of the details of the currently-selected packet. The display shows each field and its value in each protocol header in the stack. The right mouse button can be used to pop up a menu of operations.

Selecting a field in the packet details highlights the corresponding bytes in this section. The statusbar is divided into three parts, on the left some context dependent things are shown, like information about the loaded file, in the center the number of packets are displayed, and on the right the current configuration profile.

The Preferences dialog lets you control various personal preferences for the behavior of Wireshark. The selection bar in the packet list and packet details can have either a "browse" or "select" behavior.

If the selection bar has a "browse" behavior, the arrow keys will move an outline of the selection bar, allowing you to browse the rest of the list or details without changing the selection until you press the space bar.

If the selection bar has a "select" behavior, the arrow keys will move the selection bar and change the selection to the new item in the packet list or packet details. If this item is selected, the position of the main Wireshark window will be saved when Wireshark exits, and used when Wireshark is started again.

If this item is selected, the size of the main Wireshark window will be saved when Wireshark exits, and used when Wireshark is started again. If this item is selected the maximize state of the main Wireshark window will be saved when Wireshark exists, and used when Wireshark is started again.

This item allows the user to select how Wireshark handles the listing of the "File Open" Dialog when opening trace files. Allows the user to specify a persistent File Open directory. Trailing slashes or backslashes will automatically be added. This items allows the user to define how much time is spend reading the capture file to present preview data in the File Open dialog.

The File menu supports a recent file list. This items allows the user to specify how many files are kept track of in this list. When closing a capture file or Wireshark itself if the file isn't saved yet the user is presented the option to save the file when this item is set.

This items determines the behavior when reaching the beginning or the end of a capture file. When set the search wraps around and continues, otherwise it stops. This entry specifies the command line to launch a web browser. It is used to access online content, like the Wiki and user guide.

The Layout page lets you specify the general layout of the main window. You can choose from six different layouts and fill the three panes with the contents you like. The highlight method in the hex dump display for the selected protocol item can be set to use either inverse video, or bold characters.

The Columns page lets you specify the number, title, and format of each column in the packet list. The Column title entry is used to specify the title of the column displayed at the top of the packet list. The type of data that the column displays can be specified using the Column format option menu. The row of buttons on the left perform the following actions:. The Colors page can be used to change the color of the text displayed in the TCP stream window and for marked packets.

To change a color, simply select an attribute from the "Set:" menu and use the color selector to get the desired color. The new text colors are displayed as a sample text. The Capture page lets you specify various parameters for capturing live packet data; these are used the first time a capture is started.

The Interface: combo box lets you specify the interface from which to capture packet data, or the name of a FIFO from which to get the packet data.

The Data link type: option menu lets you, for some interfaces, select the data link header you want to see on the packets you capture. For example, in some OSes and with some versions of libpcap, you can choose, on an The Limit each packet to The Filter: text entry lets you set a capture filter expression to be used when capturing. The Capture packets in promiscuous mode check box lets you specify whether to put the interface in promiscuous mode when capturing. The Update list of packets in real time check box lets you specify that the display should be updated as packets are seen.

The Automatic scrolling in live capture check box lets you specify whether, in an "Update list of packets in real time" capture, the packet list pane should automatically scroll to show the most recently captured packets. The radio buttons at the top of the Printing page allow you choose between printing packets with the File:Print Packet menu item as text or PostScript, and sending the output directly to a command or saving it to a file.

The Command: text entry box, on UNIX-compatible systems, is the command to send files to usually lpr , and the File: entry box lets you enter the name of the file you wish to save to.

Additionally, you can select the File: button to browse the file system for a particular save file. The Enable MAC name resolution , Enable network name resolution and Enable transport name resolution check boxes let you specify whether MAC addresses, network addresses, and transport-layer port numbers should be translated to names. The Enable concurrent DNS name resolution allows Wireshark to send out multiple name resolution requests and not wait for the result before continuing dissection.

This speeds up dissection with network name resolution but initially may miss resolutions. The number of concurrent requests can be set here as well. This page allows you to select the number of channels visible in the RTP player window.

It determines the height of the window, more channels are possible and visible by means of a scroll bar. There are also pages for various protocols that Wireshark dissects, controlling the way Wireshark handles those protocols. The Edit Capture Filter List dialog lets you create, modify, and delete capture filters, and the Edit Display Filter List dialog lets you create, modify, and delete display filters.

The Capture Filter dialog lets you do all of the editing operations listed, and also lets you choose or construct a filter to be used when capturing packets. The Display Filter dialog lets you do all of the editing operations listed, and also lets you choose or construct a filter to be used to filter the current capture being viewed. The Read Filter dialog lets you do all of the editing operations listed, and also lets you choose or construct a filter to be used to as a read filter for a capture file you open.

The Search Filter dialog lets you do all of the editing operations listed, and also lets you choose or construct a filter expression to be used in a find operation. In all of those dialogs, the Filter name entry specifies a descriptive name for a filter, e. Web and DNS traffic. The Filter string entry is the text that actually describes the filtering action to take, as described above. The dialog buttons perform the following actions:.

For display filter expressions, pops up a dialog box to allow you to construct a filter expression to test a particular field; it offers lists of field names, and, when appropriate, lists from which to select tests to perform on the field and values with which to compare it. In that dialog box, the OK button will cause the filter expression you constructed to be entered into the Filter string entry at the current cursor position. In the Capture Filter dialog, closes the dialog box and makes the filter in the Filter string entry the filter in the Capture Preferences dialog.

In the Display Filter dialog, closes the dialog box and makes the filter in the Filter string entry the current display filter, and applies it to the current capture. In the Read Filter dialog, closes the dialog box and makes the filter in the Filter string entry the filter in the Open Capture File dialog. In the Search Filter dialog, closes the dialog box and makes the filter in the Filter string entry the filter in the Find Packet dialog.

Makes the filter in the Filter string entry the current display filter, and applies it to the current capture. If the list of filters being edited is the list of capture filters, saves the current filter list to the personal capture filters file, and if the list of filters being edited is the list of display filters, saves the current filter list to the personal display filters file. Single rows may be selected by clicking. Multiple rows may be selected by using the ctrl and shift keys in combination with the mouse button.

Adds a new filter at the bottom of the list and opens the Edit Color Filter dialog box. You will have to alter the filter expression at least before the filter will be accepted. The format of color filter expressions is identical to that of display filters. The new filter is selected, so it may immediately be moved up and down, deleted or edited.

To avoid confusion all filters are unselected before the new filter is created. Opens the Edit Color Filter dialog box for the selected filter. If this button is disabled you may have more than one filter selected, making it ambiguous which is to be edited. Allows you to choose a file in which to save the current list of color filters. You may also choose to save only the selected filters.

A button is provided to save the filters in the global color filters file you must have sufficient permissions to write this file, of course. Allows you to choose a file containing color filters which are then added to the bottom of the current list. All the added filters are selected, so they may be moved to the correct position in the list as a group. To avoid confusion, all filters are unselected before the new filters are imported.

A button is provided to load the filters from the global color filters file. Deletes your personal color filters file, reloads the global color filters file, if any, and closes the dialog. Moves the selected filter s up the list, making it more likely that they will be used to color packets. Moves the selected filter s down the list, making it less likely that they will be used to color packets. Colors the packets according to the current list of color filters, but does not close the dialog.

Saves the current list of color filters in your personal color filters file. Unless you do this they will not be used the next time you start Wireshark. Closes the dialog without changing the coloration of the packets. Note that changes you have made to the current list of color filters are not undone. The Capture Options Dialog lets you specify various parameters for capturing live packet data. The Interface: field lets you specify the interface from which to capture packet data or a command from which to get the packet data via a pipe.

The Link layer header type: field lets you specify the interfaces link layer header type. This field is usually disabled, as most interface have only one header type. The Capture packets in promiscuous mode check box lets you specify whether the interface should be put into promiscuous mode when capturing. The Capture Filter: entry lets you specify the capture filter using a tcpdump-style filter string as described above.

The File: entry lets you specify the file into which captured packets should be saved, as in the Printer Options dialog above. If not specified, the captured packets will be saved in a temporary file; you can save those packets to a file with the File:Save As menu item.

The Use multiple files check box lets you specify that the capture should be done in "multiple files" mode. This option is disabled, if the Update list of packets in real time option is checked. The Next file every You can also select the appropriate unit, but beware that the filesize has a maximum of 2 GiB. The check box is forced to be checked, as "multiple files" mode requires a file size to be specified.

The Ring buffer with This feature will capture into the first file again, after the specified number of files have been used. The Stop capture after If the check box is not checked, Wireshark will not stop capturing at some capture file size although the operating system on which Wireshark is running, or the available disk space, may still limit the maximum size of a capture file.

This option is disabled, if "multiple files" mode is used,. The Update list of packets in real time check box lets you specify whether the display should be updated as packets are captured and, if you specify that, the Automatic scrolling in live capture check box lets you specify the packet list pane should automatically scroll to show the most recently captured packets as new packets arrive. The Wireshark page lets you view general information about Wireshark, like the installed version, licensing information and such.

The Folders page lets you view the directory names where Wireshark is searching it's various configuration and other files. The Plugins List shows the name and version of each dissector plugin module found on your system. Note that a dissector plugin module may support more than one protocol; there is not necessarily a one-to-one correspondence between dissector plugin modules and protocols. Protocols supported by a dissector plugin module are enabled and disabled using the Edit:Protocols dialog box, just as protocols built into Wireshark are.

For a complete table of protocol and protocol fields that are filterable in Wireshark see the wireshark-filter 4 manual page. The preferences files contain global system-wide and personal preference settings. If the system-wide preference file exists, it is read first, overriding the default settings.

If the personal preferences file exists, it is read next, overriding any previous values. Note: If the command line flag -o is used possibly more than once , it will in turn override values from the preferences files. The preferences settings are in the form prefname : value , one per line, where prefname is the name of the preference and value is the value to which it should be set; white space is allowed between : and value. A preference setting can be continued on subsequent lines by indenting the continuation lines with white space.

A character starts a comment that runs to the end of the line:. The recent file contains personal settings mostly GUI related such as the current Wireshark window size.

The file is saved at program exit and read in at program start automatically. Note: The command line flag -o may be used to override settings from this file. The settings in this file have the same format as in the preferences files, and the same directory as for the personal preferences file is used.

The files contain protocol names, one per line, where the protocol name is the same name that would be used in a display filter for the protocol:. Note: Whenever the disabled protocols list is saved by using the Save button in the Analyze:Enabled Protocols dialog box, your personal disabled protocols file will be overwritten with the new settings, destroying any comments that were in the file.

If the personal hosts file exists, it is used to resolve IPv4 and IPv6 addresses before any other attempts are made to resolve them.

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