![]() A display filter is configured after you have captured your packets. You may not know what to focus on when you capture packets, resulting in no capture filter. Even when you have a capture filter, it may be too generic. To pull an IP address of an unknown host via ARP, start Wireshark and begin a session with the Wireshark capture filter set to arp, as shown above. Use the following display filter to show all packets that contain the specific IP in either or both the source and destination columns: ip.addr 192.168.2.11. In either case, you will need to use a display filter to narrow the traffic down. ![]() Then wait for the unknown host to come online. I’m using my cell phone and toggling the WiFi connection on and off. Regardless, when an unknown host comes online it will generate one or more ARP. This expression translates to pass all traffic with a source IPv4 address of 192.168.2.11 or a destination IPv4 address of 192.168.2.11. In this video, I respond to a question from one of my readers who wanted to create a display filter for many IP addresses. One time-consuming approach would be to literally type out all the addresses you want to filter on. However, if the addresses are contiguous or in the same subnet, you might be able to get away with a subnet filter.
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