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$FreeBSD: stable/10/tools/tools/ether_reflect/ether_reflect.1 307403 2016-10-16 22:02:50Z sevan $
.Dd December 23, 2008 .Dt ETHER_REFLECT 1 .Os .Sh NAME .Nm ether_reflect .Nd "reflect ethernet packets" .Sh SYNOPSIS .Nm .Op Fl a Ar ethernet address .Op Fl e Ar ethertype .Op Fl i Ar interface .Op Fl t Ar timeout .Op Fl p .Op Fl d .Sh DESCRIPTION The .Nm command implements a simple ethernet packet reflector using the .Xr PCAP 3 library and .Xr bpf 4 , the Berkeley Packet Filter. The program is useful primarily to test the low level round trip time of packets through an Ethernet interface and/or a switch. Network protocols, such as IP, and the network stack in general are never invoked, only the device driver that implements the particular interface is executed. As the .Nm command uses the .Xr bpf 4 device the user must have root privileges to execute this program.
p The options are as follows: l -tag -width ".Fl d Ar argument" t Fl a Ar address Instead of reversing the ethernet destination and source addresses supply a different destination ethernet address for each packet received. t Fl e Ar ether type Use a different ethertype than the default, 0x8822, which is the IEEE ether type for driver testing. t Fl i Ar interface Network interface, which can be found with ifconfig(1). t Fl t Ar timeout The time, in milliseconds, to wait for a packet. Lower times decrease latency at the cost of CPU. t Fl p Set the device into promiscuous mode before testing. This is not usually necessary. t Fl d Debug output. Print various small pieces of debug information. .El .Sh EXAMPLES The following is an example of a typical usage of the .Nm command:
p .Dl "ether_reflect -i em0 -t 1"
p Reflect all test packets, those with an ether type of 0x8822, which are seen on ineterface em0. The timeout is 1 millisecond.
p .Dl "ether_reflect -i em0 -a 00:00:00:aa:bb:cc -t 1"
p Rewrite the destination address in each packet to 00:00:00:aa:bb:cc before reflecting the packet. .Sh SEE ALSO .Xr ifconfig 8 , .Xr tcpdump 1 , .Xr pcap 4 , .Xr bpf 2 . .Sh HISTORY The .Nm program first appeared in .Fx 8.0 . .Sh AUTHORS This manual page was written by .An George V. Neville-Neil Aq Mt gnn@FreeBSD.org . .Sh BUGS Should be reported to the author or to .Aq Mt net@FreeBSD.org .