![]() ![]() The display filter syntax to filter out addresses between 192.168.1.1 – 192.168.1.255 would be ip.addr=192.168.1.0/24 and if you are comfortable with IP subnetting, you can alter the /24 to change the range. Letting air out of tires in the rain: any chance of water. However, if the addresses are contiguous or in the same subnet, you might be able to get away with a subnet filter. Here is an ARP packet: 192.168.1.3 ARP 62 Who has 192.168.1.1. One time-consuming approach would be to literally type out all the addresses you want to filter on. In this video, I respond to a question from one of my readers who wanted to create a display filter for many IP addresses. In either case, you will need to use a display filter to narrow the traffic down. Even when you have a capture filter, it may be too generic. You may not know what to focus on when you capture packets, resulting in no capture filter. A display filter is configured after you have captured your packets. if you know that the computer with the IP 192.168.1.1 has a problem, and your capture has tons of conversations, you can filter on. A capture filter is configured prior to starting your capture and affects what packets are captured. Looking only at SYN packets is not very helpful if you need to find a conversation that has problems - it's usually better to gather as much information about the IPs involved in the problem and filter on them. Note that in Wireshark, display and capture filter syntax are completely different. In this video, I review the two most common filters in Wireshark. One of the keys to being an effective network troubleshooter when using a protocol analyzer is the ability to see patterns, which is where filters come into play. ![]()
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