Wireshark filters expression manual#

Lower(string-field) - converts a string field to lowercase Upper(string-field) - converts a string field to uppercase The filter language has the following functions:

Or selecting the ``About Wireshark'' item from the ``Help'' menu in Wireshark. Note: the ``matches'' operator is only available if Wireshark or TShark have been compiled with the PCRE library. The comparison operators can be expressed either through English-like abbreviations or through C-like symbols: Note: all protocol and field names that are available in Wireshark and TShark filters are listed in the comprehensive FILTER PROTOCOL REFERENCE (see below).įields can also be compared against values. Think of a protocol or field in a filter as implicitly having the ``exists'' operator. To see all packets that contain a Token-Ring RIF field, use ``tr.rif''. If you want to see all packets which contain the IP protocol, the filter would be ``ip'' (without the quotation marks). The simplest filter allows you to check for the existence of a protocol or field.

Wireshark filters expression manual#

This manual page describes their syntax and provides a comprehensive reference of filter fields. Display filters let you compare the fields within a protocol against a specific value, compare fields against fields, and check the existence of specified fields or protocols.įilters are also used by other features such as statistics generation and packet list colorization (the latter is only available to Wireshark). If a packet meets the requirements expressed in your filter, then it is displayed in the list of packets. Tshark DESCRIPTION Wireshark and TShark share a powerful filter engine that helps remove the noise from a packet trace and lets you see only the packets that interest you.

NAME wireshark-filter - Wireshark filter syntax and reference SYNOPSYS wireshark