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It works well, we have have good experience using it.
We can check when a PCAP file begins and ends by simply parsing the first and last packet.
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And we needed to reconstruct it as well as we could, as the dataset was full of sweet simulated attacks, perfect for exercising the algorithmic threat detection we are developing. All in one folder and without worker ID configured as part of the PCAP naming scheme. Rather, it consisted of N sequential PCAP subsets, where N corresponds to the number of workers configured in Moloch. But the dataset was not sequential at all. In other words, our script relied on having sequential PCAP files. The first PCAP file will simply rotate faster.
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One thread would therefore receive a large HTTP file download while another gets a lot of small DNS queries. Some workers will see more traffic volume than others, even if the flow balancer is able to distribute roughly the same number of sessions to each thread. No information exchange happens between workers due to the extreme throughput they need to handle, and each worker can write those packets out to a separate PCAP file. Flow reconstruction 101 – all packets in a flow need to pass through the same worker. Like Suricata, it reconstructs sessions from the ground up. That set was written using Moloch full packet capture. But we quickly figured out what happened. Sure, we were aware that replaying with average rate would flatten out all bursts, but that still seemed too much. Given that entire dataset only spans for three days, we were understandably puzzled. Not ideal for developing algorithmic threat detection, but the result should be close enough, right?Īvg_pps= $(capinfos $Īfter four days, our replay had only gone through about 10-15% of all PCAP files. Just read PCAP metadata using capinfos, extract average packet rate and then replay the file at that extracted average rate.
When setting up replay for a particular bigger-than-average PCAP set, we initially tried the typical bash rocket approach. Historically, we have used tcpreplay with predetermined PPS options. All leveraging the Suricata network IDS/IPS/NSM engine. We specialize in network detection and response solutions which include signature ruleset management, network threat hunting, advanced threat intelligence and data analytics. Stamus Networks develops Scirius Security Platform and open-source Scirius CE, network security platforms. It can also calculate metadata for PCAP files and extract files from compressed tarballs (with no intermediate storage requirements).
While preserving timestamps between each packet.
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First implemented feature being the ability to concurrently replay offline PCAP files on live network interface. GoperCap uses gopacket and cobra to build a CLI tool for PCAP manipulation.