As an IP datagram contains both a source and a destination address, the expression will evaluate to true whenever at least one of the two addresses differs from 1.2.3.4. Move to the next packet of the conversation (TCP, UDP or IP). In the packet detail, closes all tree items. Move to the previous packet, even if the packet list isn’t focused. In the packet detail, opens all tree items. The reason for this, is that the expression ip.addr != 1.2.3.4 must be read as “the packet contains a field named ip.addr with a value different from 1.2.3.4”. Move to the next packet, even if the packet list isn’t focused. Instead, that expression will even be true for packets where either source or destination IP address equals 1.2.3.4. Unfortunately, this does not do the expected. Then they use ip.addr != 1.2.3.4 to see all packets not containing the IP address 1.2.3.4 in it. Often people use a filter string to display something like ip.addr = 1.2.3.4 which will display all packets containing the IP address 1.2.3.4. Using the != operator on combined expressions like eth.addr, ip.addr, tcp.port, and udp.port will probably not work as expected. Which filters packets where either the source OR the destination is not C, and that's every packet, so it shows every packet. Wireshark uses the same syntax for capture filters as tcpdump, WinDump, Analyzer, and any other program that uses the libpcap/WinPcap library. Which filters packets where source or destination match, and then hides them (correctly). An overview of the capture filter syntax can be found in the Users Guide.A complete reference can be found in the expression section of the pcap-filter(7) manual page. In Boolean Logic, A not equals B and not A equals B are the same test.īut, the relevant part of the WireShark documentation linked by Jürgen Thelen explains that in WireShark, ip.addr covers both the source and destination field, so the test is more like: not ((A or B) equals C)
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