> That string isn't a valid capture filter (can't parse filter expression: > tshark: Invalid capture filter 'udp.port=5060,sip' for interface > Running as user 'root' and group 'root'.

> nicholas $ sudo tshark -f udp.port=5060,sip > It says that this isn't a valid capture filter due to a syntax error: Hopefully no other protocols will be using it. Port 5060' ' then that will limit the capture to that UDP port, and

'sip' isn't part of the display filter syntax so that's why you get theĮrror, also note that capture filters don't use '='. To limit the packets read from a capture (and can't be used on a liveĬapture) with the -r flag (which also requires the -2 flag). The display filter syntax can also be used as a 'Read' filter The display filter syntax is described here: The capture filter syntax is described here:ĭefault filter for tshark or can be preceded by the -f flag. Require full dissection so are lower performing. Very powerful tools indeed.There are two filter syntaxes, the capture filter syntax, also known as BPFįilters, which is a high performance filter that limits which packets areĬaptured but concentrates on Layer 1-3 filtering and display filters whichĬan operate on any field in any protocol that Wireshark knows about but As a result, to ensure that DNS packets appear when searching for domain names, the filter frame contains “google” should be used instead of frame contains “”. Note that DNS records use various separators in place of literal dots “.”. For example, if I wanted to find my dns query for dns and frame contains 'cloudshark' Last but not least, you can of course always use the concatenation operators. You can even get more specific, using the “contains” filter to look at specific parts of a frame, such as tcp contains or eth contains. For example, if I only want to view the DNS query with transaction ID Oxb413: The frame contains feature can also be used for Hex values. Take a look at this capture with the above filter applied: …will show you only those packets that contain the word “cloudshark” somewhere in them.ĬloudShark lets you embed these filters right in the URL that you share. The “frame contains” filter will let you pick out only those packets that contain a sequence of any ASCII or Hex value that you specify. You may know the common ones, such as searching on ip address or tcp port, or even protocol but did you know you can search for any ASCII or Hex values in any field throughout the capture? The great thing about CloudShark’s capture decode is that it supports all of the standard Wireshark display filters.

Wireshark capture filter port