So, this filter is a powerful one, being that a TCP reset kills a TCP connection immediately. All packets have a TCP, if this is set to 1, it tells the receiving computer that it should at once stop using that connection. Sometimes is just useful and less time consuming to look only at the traffic that goes into or out of a specific port. Sets filters for any TCP packet with a specific source or destination port. Want to find out why some websites don’t appear? You just have to set it to ‘dns’. So, if you need to track down an odd FTP traffic, then you just have to set it for ‘ftp’. It lets you narrow down to the exact protocol you need. Sets a filter to display all http and dns protocols. It helps you when you are looking for specific data, so you don’t have to go through others that don’t interest you. This one helps you check the data between two specific hosts or networks. Sets a conversation filter between two specific IP addresses. (or ip.src = xxxx & ip.dst = xxxx - for a destination) The following are their preferred choices. We’ve asked our engineers what are their favourite filters and how they use them. What you want to filter on exactly depends on your specific situation and purpose, of course. Most of the following display filters work on live capture, as well as for imported files, giving you the possibility to filter on almost any field of any protocol, down to the HEX values of your data streams. You can even compare values, search for strings, hide unnecessary protocols and so on. Thankfully, Wireshark allows the user to quickly filter all that data, so you only see the parts you’re interested in, like a certain IP source or destination. Capturing so many packets, means that you will end up seeing huge captured files. Unfortunately, the amount of information you will get when capturing a network line can be daunting. One of the most used network protocol analyzer out there, it analyzes the files that come out of your network TAP (called also a packet capture device) or your computer’s NIC and lets you have an in-depth look into their parameters, messages, format, etc. This is where a tool like Wireshark comes in handy. Most of the times, when your network crashes or you come across an issue, you have to search through your captured packets to find the problem.
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