![]() ![]() However, in the code it seems to be vice versa (-Y sets the filter for pass two and -R sets the filter for pass one), or maybe I don't understand the code correctly. And -R should be called the 'display filter', as that's the filter that is applied on both passes, which makes it more like a display filter. With the display filter 'tcp.port 80 & udp. In that respect, -Y should be called the 'read filter' as it is applied only once during the first/single pass, while the file is being read. With the display filter 'tcp.port 80 udp.port 80' you are looking for packets which are TCP or UDP ports 80. Complete documentation can be found at the pcap-filter man page. Below is a brief overview of the libpcap filter language’s syntax. Wireshark capture filters are written in libpcap filter language. So, -Y is single pass and -R -r is two-pass. Wireshark supports limiting the packet capture to packets that match a capture filter. Tshark -nr input.pcap -R "ip.addr eq 1.2.3.4" Now, if I run the following command (1.11.x): Y packet displaY filter in Wireshark display filter syntax R packet Read filter in Wireshark display filter syntax Hint: currently it only supports libpcap files, not pcap-ng files! So, if you want to use WinDump for pcap-ng files, you need to convert them firstįrom tshark -h -2 perform a two-pass analysis Windump -nr input.pcap -w output.pcap "ip host 192.168.0.2" ![]() Windump -nr input.pcap -w output.pcap "icmp" It will work like tcpdump, meaning it accepts capture filters. Tshark -nr input.pcap -Y "ip.addr eq 192.168.0.2" -w output.pcap Tshark -nr input.pcap -Y "icmp" -w output.pcap ![]() Sure, you can also use 'display/read' filters, and the change in the syntax shouldn't be too complex, at least not for simple capture filters. It accepts tcpdump capture filters: ĭo I need to learn how to write an equivalent read filter for my capture filter? If you prefer a scripted solution, take a look at pcap-util2. Is there another tool that will do what I want,įor windows there is a tool called SplitCap, but the filter syntax is neither capture filter nor display filter. To see an example, open bigFlows.pcap and use the icmp.type 3 filter, which will display all ICMP packets with a Type 3: Destination unreachable error. ![]()
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