Wireshark filter subnet5/15/2023 Inside GNS3, I can right click right on the red line and select “ Start capture”. One of your first steps is to fire up your packet sniffer. You can see the connectivity is obviously failing. This could be a situation where you’ve been notified that the network’s down and there are problems. It’s trying, it’s trying, it’s trying, and we’re going to sit here with a little bit of patience and realize that it’s going to choke and die. Let’s see what happens if I try to ping 10.1.1.254. I’m going to try to ping the default gateway, it’s on router three there, the 10.1.1.254, and see if I can get there. All I need is something to generate ping, so that works just fine. My PCs are really routers, as you all know if you use GNS3, they’re really routers that are configured to act like IP endpoints. I have here a couple of clients, this is built in GNS3. We’re going to run through collecting some information about it, and then we’re going to fix it and make sure it works. I’ll show you a situation where I have, at least in the beginning, on purpose, misconfigured a subnet mask situation or IP address and mask situation. Of course, right away you say, “That would never happen in my network.” Just in case it does, or better yet, when you need to blame someone else and you came along after the fact. Today, I want to talk to you about the possibility of a misconfiguration in your network.
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