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Pktreplay

pktreplay reads packets from pcap file or interface and writes them into output interface. By default packets are written with the same rate they have been saved into the pcap file, or, when reading from interface, as fast as they are received.

pktreplay takes its inspiration from tcpreplay, but without packet editing capabilities.

pktreplay uses libpcap through Rust -bindings provided by luomu-libpcap to access network data and pcap files.

Usage

pktreplay needs to be run as root or (on Linux) with cap_net_raw capability to be able to write raw data to the interface.

Following command line options are available:

  • Options to control where packets are read from. One of these must be present:
    • -f or --file <FILE>: Read packets from pcap file FILE.
    • -i or --interface <IFNAME>: Read packets from given interface.
  • -o or --output <IFNAME>: Write packets to interface with name IFNAME. If this option is not given, packets are written to /dev/null.
  • -l or --loop: Loop packets from file, that is start writing packets again from the beginning once all packets are written. Program terminates when user presses ctrl+c.
  • -c or --count <NUM>: Read only NUM first packets from the file and output them. If --loop is set, then loop the first NUM packets.
  • -S or --stats <SEC>: Print statistics every `SEC`` seconds.
  • Options to control packet rate. Only one can be given, if none of these options is present, packets are written with the rate they have been saved to the pcap file or as soon as they are received from interface:
    • -F or --fullspeed: Write packets as fast as possible.
    • -p or --pps <RATE>: Write packets with RATE (integer) packets per second.
    • -M or --mbps <RATE>: Write packets with RATE (float) mega(million) bits per second.
  • Options to control internal packet buffer size. pktreplay reads packets into internal buffer from where they are written to interface.
    • -H or --high <NUM>: Maximum number of packets to buffer. After this many packets are buffered, no more packets are read into the buffer until buffer contains only low number of packets.
    • -L or --low <NUM>: Low watermark for packet buffer. If buffer contains only this number of packets, new packets are read into the buffer until the buffer contains hi number of packets. Default value for this is half of the maximum number of packets.

After packets are written, a summary is written to stdout. The program can be terminated by pressing ctrl+C.