Logical OR, it is enough that only one condition is true if both are true, then this also fine. Only data matching both conditions will be displayed.

For example, the ip.src=192.168.1.1 and tcp filter will show only packets that originate from 192.168.1.1 and which are associated with the TCP protocol. Logical AND, data is output if they match to both parts of the filter. It is recommended to use brackets additionally, because otherwise you may not get the result you expect. Logical operators allow you to create detailed filters using several conditions at once. When using with = (equal), this bug is missing. For example, as here in an attempt to filter not one port, but the range of ports:īut actually the filter value (in this case, tcp.port) is overwritten by the last value, so as a result, instead of the expected behavior, we get the result of only the last part, in this case it is Consider them:Īs you can see, there are two versions, for example, if we want to indicate that the filter value is equal to something, then we can use = or eq.įilters using logical operands can be used to build rather complex structures, but apparently, usage of the same filter with comparison operators is buggy. For example, to show TCP packets containing the string hackware you need the following filter: If an inaccurate entry is sought (better suited for non-numeric values) then contains is used. Remember that in any case you can substitute your data, for example, change the port number to any one of your interest, and also do the same with the IP address, MAC address, time value, etc.įilters can have different values, for example, it can be a string, a hexadecimal format or a number. Some filters are written here in a general form, and some are made as literal examples. To fully understand the importance of filters and their meanings, it is necessary to understand how the network works. Here I consider the display filters that are entered in the main window of the program in the top field below the menu and icons of the main functions. this function will be called for every packetĮnd conditions/initfilter.Remember that Wireshark has display filters and capture filters. Local tap = Listener.new('frame','tcp')ĭefaultFilter = defaultFilter or '' Last file is where you can customize your default filter. Find the place where lua scripts should go and create the following 3 files.

Wireshark protocol filter example