For example, the filter !dns will show all packets except DNS. That is, all packets will be shown, except those that satisfy the condition following the NOT. For example, the tcp.port=80 or tcp.port=8080 filter will show TCP packets that are related (are the source or destination) to port 80 or 8080.īoolean is NOT used when we want to exclude some packages. 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.
#WIRESHARK CAPTURE FILTER PORT RANGE MAC#
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. Remember that Wireshark has display filters and capture filters. Icmp: to restrict recording of the packets only to the ICMP packets. The following is a list of some commonly used tcpdump options supported with the nstcpdump.sh script: Note: Unless you have specified a packet count, discussed later in this article, you must stop the nstcpdump.sh script either by running the kill command or by pressing the Ctrl+ C keys simultaneously. The following is the syntax to run the nstcpdump.sh script: To run the script, you must switch to the shell prompt of the ADC appliance by running the shell command from the command line interface of the appliance. Most of the entries in the output of the script have the data in the form of an IP address, TCP or UDP port number, or physical interface. NOTE: Before you run the nstcpdump.sh script you must decide the data you want in the output of the script, else a large amount of unnecessary data might be available in the output. NOTE: nstcpdump is NOT RECOMMENDED for use on modern ADC versions, due to it's ability to interfere with Netscaler operations (especially on single-packet-engine VPX's) which can lead to traffic interruptions and even crashes in severe cases. This article contains information about the commonly used options and filters with the nstcpdump.sh ADC script.
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