frame contains “string”: searches for a string in all the frame content, independently of being IP, IPv6, UDP, TCP or any other protocol above layer 2.The “contains” operator can be used to find text strings or hexadecimal characters directly with the name of the protocol instead of specific filters like http.host or. In the middle of so many transactions and a working store, how to find the TCP conection that has the transaction to troubleshoot? The solution The application was developed in-house, didn’t use any of the known application protocols like HTTP or FTP and wasn’t encrypted.
Recently, I had to look at a problem of a sales application where users reported that “the network was slow”. While most people think of it at the end of the fight, with me it’s always on top of the list. Nevertheless, it is the current behavior, so best practice is to always add a colon after each byte if you're searching for bytes so Wireshark behaves as expected.Wireshark is my tool of choice for troubleshooting. I don't know if this behavior (interpreting 1 or 2 bytes as a byte array, but interpreting any more than 2 as a character string) should be considered a Wireshark bug or not, but perhaps it should be, in which case feel free to file a Wireshark bug. In the former case, Wireshark interprets the data as a byte array, but in the latter case, it interprets the data as an unquoted character string, so by including the colon's between the bytes, you instruct Wireshark to interpret the data as a byte array, which is the intent. The " contains" operator allows a filter to search for a sequence of characters, expressed as a string (quoted or unquoted), or bytes, expressed as a byte array, or for a single character, expressed as a C-style character constant.
To quote from the wireshark-filter man page: Can you try: ip.addr = 10.222.22.77 and udp contains 0a:20:01:11:22:33ĮDIT: If you have dftest, you can run dftest "udp contains 0a20", and you'll get: Filter: "udp contains 0a20"
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