A complete list of field names can be found by accessing the display filter expression builder (described in the Wireshark section of this chapter) or by accessing the Wireshark help file. Some example field names might include the protocol icmp, or the protocol fields icmp.type and de. Unlike capture filters, display filters are applied to a packet capture after data has been collected.Įarlier we discussed how to use display filters in Wireshark and tshark, but let’s take a closer look at how these expressions are built, along with some examples.Ī typical display filter expression consists of a field name, a comparison operator, and a value.Ī field name can be a protocol, a field within a protocol, or a field that a protocol dissector provides in relation to a protocol. As of version 1.10, Wireshark supports around 1000 protocols and nearly 141000 protocol fields, and you can create filter expressions using any of them. Because of this, they are a lot more powerful. These are different than capture filters, because they leverage the protocol dissectors these tools use to capture information about individual protocol fields. Wireshark and tshark both provide the ability to use display filters. Chris Sanders, Jason Smith, in Applied Network Security Monitoring, 2014 Wireshark Display Filters

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