1.\" Copyright (c) 2016 Luigi Rizzo, Universita` di Pisa 2.\" All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. 9.\" 2. Redistributions in binary form must reproduce the above copyright 10.\" notice, this list of conditions and the following disclaimer in the 11.\" documentation and/or other materials provided with the distribution. 12.\" 13.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 14.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 16.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 17.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 18.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 19.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 20.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 21.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 22.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 23.\" SUCH DAMAGE. 24.\" 25.\" $FreeBSD$ 26.\" 27.Dd December 21, 2018 28.Dt NMREPLAY 8 29.Os 30.Sh NAME 31.Nm nmreplay 32.Nd playback a pcap file through a netmap interface 33.Sh SYNOPSIS 34.Bk -words 35.Bl -tag -width "nmreplay" 36.It Nm 37.Op Fl f Ar pcap-file 38.Op Fl i Ar netmap-interface 39.Op Fl B Ar bandwidth 40.Op Fl D Ar delay 41.Op Fl L Ar loss 42.Op Fl b Ar batch size 43.Op Fl w Ar wait-link 44.Op Fl v 45.Op Fl C Ar cpu-placement 46.El 47.Ek 48.Sh DESCRIPTION 49.Nm 50works like 51.Nm tcpreplay 52to replay a pcap file through a netmap interface, 53with programmable rates and possibly delays, losses 54and packet alterations. 55.Nm 56is designed to run at high speed, so the transmit schedule 57is computed ahead of time, and the thread in charge of transmission 58only has to pump data through the interface. 59.Nm 60can connect to any type of netmap port. 61.Pp 62Command line options are as follows 63.Bl -tag -width Ds 64.It Fl f Ar pcap-file 65Name of the pcap file to replay. 66.It Fl i Ar interface 67Name of the netmap interface to use as output. 68See 69.Xr netmap 4 70for interface name format. 71.It Fl v 72Enable verbose mode 73.It Fl b Ar batch-size 74Maximum batch size to use during transmissions. 75.Nm 76normally transmits packets one at a time, but it may use 77larger batches, up to the value specified with this option, 78when running at high rates. 79.It Fl B Ar bps | Cm constant , Ns Ar bps | Cm ether , Ns Ar bps | Cm real Ns Op , Ns Ar speedup 80Bandwidth to be used for transmission. 81.Ar bps 82is a floating point number optionally follow by a character 83(k, K, m, M, g, G) that multiplies the value by 10^3, 10^6 and 10^9 84respectively. 85.Cm constant 86(can be omitted) means that the bandwidth will be computed 87with reference to the actual packet size (excluding CRC and framing). 88.Cm ether 89indicates that the ethernet framing (160 bits) and CRC (32 bits) 90will be included in the computation of the packet size. 91.Cm real 92means transmission will occur according to the timestamps 93recorded in the trace. 94The optional 95.Ar speedup 96multiplier (defaults to 1) indicates how much faster 97or slower than real time the trace should be replayed. 98.It Fl D Ar dt | Cm constant , Ns Ar dt | Cm uniform , Ns Ar dmin,dmax | Cm exp , Ar dmin,davg 99Adds additional delay to the packet transmission, whose distribution 100can be constant, uniform or exponential. 101.Ar dt, dmin, dmax, avt 102are times expressed as floating point numbers optionally followed 103by a character (s, m, u, n) to indicate seconds, milliseconds, 104microseconds, nanoseconds. 105The delay is added to the transmit time and adjusted so that there is 106never packet reordering. 107.It Fl L Ar x | Cm plr , Ns Ar x | Cm ber , Ns Ar x 108Simulates packet or bit errors, causing offending packets to be dropped. 109.Ar x 110is a floating point number indicating the packet or bit error rate. 111.It Fl w Ar wait-link 112indicates the number of seconds to wait before transmitting. 113It defaults to 2, and may be useful when talking to physical 114ports to let link negotiation complete before starting transmission. 115.El 116.Sh OPERATION 117.Nm 118creates an in-memory schedule with all packets to be transmitted, 119and then launches a separate thread to take care of transmissions 120while the main thread reports statistics every second. 121.Sh SEE ALSO 122.Xr netmap 4 123.Sh AUTHORS 124.An -nosplit 125.Nm 126has been written by 127.An Luigi Rizzo, Andrea Beconcini, Francesco Mola and Lorenzo Biagini 128at the Universita` di Pisa, Italy. 129