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113 lines
3.5 KiB
Groff
113 lines
3.5 KiB
Groff
.\" Copyright (c) 2008 George V. Neville-Neil
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd December 23, 2008
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.Dt ETHER_REFLECT 1
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.Os
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.Sh NAME
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.Nm ether_reflect
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.Nd "reflect ethernet packets"
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.Sh SYNOPSIS
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.Nm
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.Op Fl a Ar ethernet address
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.Op Fl e Ar ethertype
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.Op Fl i Ar interface
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.Op Fl t Ar timeout
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.Op Fl p
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.Op Fl d
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.Sh DESCRIPTION
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The
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.Nm
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command implements a simple ethernet packet reflector using the
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.Xr PCAP 3
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library and
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.Xr bpf 4 ,
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the Berkeley Packet Filter.
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The program is useful primarily to test the low level round trip time
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of packets through an Ethernet interface and/or a switch.
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Network protocols, such as IP, and the network stack in general are never
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invoked, only the device driver that implements the particular interface
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is executed.
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As the
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.Nm
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command uses the
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.Xr bpf 4
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device the user must have root privileges to execute this program.
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.Pp
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The options are as follows:
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.Bl -tag -width ".Fl d Ar argument"
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.It Fl a Ar address
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Instead of reversing the ethernet destination and source addresses
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supply a different destination ethernet address for each packet
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received.
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.It Fl e Ar ether type
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Use a different ethertype than the default, 0x8822, which is the IEEE
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ether type for driver testing.
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.It Fl i Ar interface
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Network interface, which can be found with ifconfig(1).
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.It Fl t Ar timeout
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The time, in milliseconds, to wait for a packet.
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Lower times decrease latency at the cost of CPU.
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.It Fl p
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Set the device into promiscuous mode before testing.
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This is not usually necessary.
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.It Fl d
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Debug output.
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Print various small pieces of debug information.
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.El
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.Sh EXAMPLES
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The following is an example of a typical usage
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of the
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.Nm
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command:
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.Pp
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.Dl "ether_reflect -i em0 -t 1"
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.Pp
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Reflect all test packets, those with an ether type of 0x8822, which
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are seen on ineterface em0.
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The timeout is 1 millisecond.
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.Pp
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.Dl "ether_reflect -i em0 -a 00:00:00:aa:bb:cc -t 1"
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.Pp
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Rewrite the destination address in each packet to 00:00:00:aa:bb:cc
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before reflecting the packet.
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.Sh SEE ALSO
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.Xr tcpdump 1 ,
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.Xr bpf 2 ,
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.Xr pcap 4 ,
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.Xr ifconfig 8
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.Sh HISTORY
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The
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.Nm
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program first appeared in
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.Fx 8.0 .
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.Sh AUTHORS
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This
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manual page was written by
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.An George V. Neville-Neil Aq Mt gnn@FreeBSD.org .
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.Sh BUGS
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Should be reported to the author or to
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.Aq Mt net@FreeBSD.org .
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