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A capture file saved in the format that libpcap, WinPcap, and Npcap use can be read by applications that understand that format, such as tcpdump, Wireshark, CA NetMaster, or Microsoft Network Monitor 3.x. The file format is described by Internet-Draft draft-ietf-opsawg-pcap; [5] the current editors' version of the draft is also available. [6]
pcap Libpcap File Format [2] A1 B2 C3 D4 ¡²ÃÔ: 4D 3C B2 A1 (little-endian) M<²¡ 0 pcap Libpcap File Format (nanosecond-resolution) [2] A1 B2 3C 4D (big-endian) ¡²<M: 0A 0D 0D 0A ␊␍␍␊ 0 pcapng PCAP Next Generation Dump File Format [3] ED AB EE DB: í«îÛ: 0 rpm RedHat Package Manager (RPM) package [4] 53 51 4C 69 74 65 20 66 6F ...
PCAP-over-IP is a method for transmitting captured network traffic through a TCP connection. [1] The captured network traffic is transferred over TCP as a PCAP file in order to preserve relevant metadata about the packets, such as timestamps.
Wireshark's native network trace file formats are the libpcap format read and written by libpcap, WinPcap, and Npcap, so it can exchange captured network traces with other applications that use the same format, including tcpdump and CA NetMaster, and the pcapng format read by newer versions of libpcap.
Tcpreplay is the most common program for this task since it is capable of taking a stored packet stream in the pcap format and sending those packets at the original rate or a user-defined rate. Scapy also supports send functions to replay any saved packets/pcap. Ostinato added support for pcap files in version 0.4. [4]
netsniff-ng: a zero-copy analyzer, packet capturer and replayer, itself supporting the pcap file format; trafgen: a zero-copy wire-rate traffic generator; mausezahn: a packet generator and analyzer for HW/SW appliances with a Cisco-CLI; bpfc: a Berkeley Packet Filter (BPF) compiler; ifpps: a top-like kernel networking statistics tool
That interpreter can also be used when reading a file containing packets captured using pcap. Another user-mode interpreter is uBPF, which supports JIT and eBPF (without cBPF). Its code has been reused to provide eBPF support in non-Linux systems. [6] Microsoft's eBPF on Windows builds on uBPF and the PREVAIL formal verifier.
Free and open-source software portal; Bit-Twist is a powerful libpcap-based Ethernet packet generator and packet capture editor, written in POSIX-compliant C, designed to complement tcpdump by replaying captured traffic from pcap files onto live networks.