The "Filter Expression" dialog box can help you build display filters. For display filters, try the display filters page on the Wireshark wiki. For example, to capture only packets sent to port 80, use: dst tcp port 80Ĭouple that with an http display filter, or use: tcp.dstport = 80 & httpįor more on capture filters, read " Filtering while capturing" from the Wireshark user guide, the capture filters page on the Wireshark wiki, or pcap-filter (7) man page. At the bottom of this screen, there is a field for (Pre)-Master-Secret log filename. At this point, you should see something similar to the screen below. Select Protocols in the left-hand pane and scroll down to TLS. Show only the DNS based traffic: dns Capture Filter. Before we start the capture, we should prepare it for decrypting TLS traffic. That said, please try the following filter and see if you're getting the entries that you think you should be getting: dns and (ip.dst159.25.78.7 or ip.src159.57.78. A complete list of DNS display filter fields can be found in the display filter reference. If you want to measure the number of connections rather than the amount of data, you can limit the capture or display filters to one side of the communication. I would go through the packet capture and see if there are any records that I know I should be seeing to validate that the filter is working properly and to assuage any doubts. Note that a filter of http is not equivalent to the other two, which will include handshake and termination packets. This filter includes only packets that come to and from your network interface. Ping packets should use an ICMP type of 8 (echo) or 0 (echo reply), so you could use a capture filter of: icmpĪnd a display filter of: icmp.type = 8 || icmp.type = 0įor HTTP, you can use a capture filter of: tcp port 80
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