Network captures often result in very large files. Therefore, tools like tcpdump or dumpcap offer features of file rotation either after a fixed size or a fixed amount of time. When these files are analyzed focusing on stateful protocols such as TCP, TCP sessions could have been established in one pcap file and continue in the next pcap files. When these TCP sessions have to be properly reassembled, then either the TCP reassembly tool has to support multiple pcap files as input or the pcap files have to merged in a single file using for instance a tool such as editcap. However, in this case, very large files are the results, that were tried to be avoided with the file rotation.