A nice tool to do this is tcpreplay which has versions for both Windows and Linux. How to “replay” the traffic in PCAP filesīy “replay” i mean making the packets in the PCAP files actually pass through the network. That may not be what you want, however, as it causes actual network. Just start capturing, stop when you have everything you need and go to File->Save As, and it will automatically save it in PCAP format.Ī command-line approach would imply using tcpdump: I think there are tools that can take a capture file and replay it, using the packet time stamps to determine when to send the packets, so that, for example, if two packets in the file have time stamps 1 second apart, the packets will be sent 1 second apart. Wireshark is probably the most accesible and easy to use for everybody, on both Linux and Windows. Generating your own PCAP files can be done really simple, by using the appropiate tools. By displaying your data properly, all key elements of a packet can be identified and learned about much more interactively and easily than plain courses. What better way to test if not by confronting with the traffic that you want to protect from?Įxercise – PCAP files can be a great learning material for networking/IT security students. Testing your IDS/NSM – let’s say you just deployed an IDS in your network. If the security departament has detected a breach/intrusion in the network, PCAP files are essential to look at, in order to better understand the situation and why did it happen This traffic (or at least a part of it) is stored for later analysis. Network forensics – an average or big company network can generate GBs of traffic daily. A PCAP file holds network traffic/packet information, captured in a certain period. This packet capture replay feature brings incredible power to accurately reproduce the conditions of your network - without the need for expensive and complicated traffic generators.PCAP stands for Packet CAPture. Pla圜ap has a very simple user interface, designed to be completely intuitive to anyone using it. In future versions, variable speed playback may be added if it is desired. In its early versions, only straight playback (full speed) is supported. You can adjust the timing to have it run slower or faster than the original to change the amount of bandwidth it consumes. This is Pla圜ap, the tool for playing back Wireshark, tcpdump, and libpcap captures. Or instead of reproducing individual applications, you can record a slice of all traffic on your network for a short period and replay it. It cant be used to capture, only for analysis and it can only open old-style. The interface looks similar to Wiresharks. Want to simulate a hundred voice streams? Just capture one and have Netropy run a hundred copies. Ive never looked at it previously, but downloaded and installed it just now, and probably wont launch it a second time. Then simply configure how many copies of each stream to run on the emulated WAN link. Then import those files into the Netropy emulator. Netropy will run each stream continuously in a loop until stopped so you don’t need to record a long sample. Just fire up a Netflix movie and record a few minutes of the stream with Wireshark or any other packet sniffer. This feature makes it easy to see how other traffic on the network affects the performance of the application you’re testing.įor example, if you want to see how well your mission-critical ERP system will work when two users are watching Netflix, five are doing Skype video chat, and the sales team is doing a WebEx presentation, Netropy can now simulate that easily. Perhaps the most important new feature added in Netropy v2.0, and certainly the most interesting, is the ability to replay PCAP files as background traffic.
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