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.TH "arping" "8" "21th June, 2003" "arping" ""
.PP
.SH "NAME"
arping \- sends arp and/or ip pings to a given host
.PP
.SH "SYNOPSIS"
\fBarping\fP [-abhpqrRd0uv] [-S \fIhost/ip\fP] [-T \fIhost/ip\fP] [-s \fIMAC\fP] [-t \fIMAC\fP] [-c \fIcount\fP] [-i \fIinterface\fP] [ -w \fIus\fP ] <\fIhost\fP | -B>
.PP
.SH "DESCRIPTION"
The \fIarping\fP utility sends \fBARP\fP and/or \fBICMP\fP requests to the specified \fIhost\fP and displays the replies\&. The \fIhost\fP may be specified by its \fBhostname\fP, its \fBIP\fP address, or its \fBMAC\fP address\&.
.PP
One request is sent each second\&.
.PP
When pinging an IP an ARP who-has query is sent\&. When pinging a MAC
address a directed broadcast ICMP Echo request is sent\&. For more
technical explaination and an FAQ, see the README file\&.
.PP
\fIImportant note on timing\fP
.PP
ARP packets are usually replied to (on a LAN) so fast that the OS task
scheduler can\&'t keep up to get exact enough timing\&.
On an idle system the roundtrip times will be pretty much accurate, but
with more load the timing gets less exact\&.
.PP
To get more exact timing on a non-idle system, re-nice arping to -15 or so\&.
.PP
# nice -n -15 arping foobar
.PP
This is not just an issue with arping, it is with normal ping also
(at least it is on my system)\&. But it doesn\&'t show up as much with ping
since arping packets (when pinging IP) doesn\&'t traverse the IP stack when
received and are therefore replied to faster\&.
.PP
.SH "OPTIONS"
.PP
.IP "-0"
Use this option to ping with source IP address 0\&.0\&.0\&.0\&. Use this
when you haven\&'t configured your interface yet\&.
Note that this may get the MAC-ping unanswered\&.
This is an alias for -S 0\&.0\&.0\&.0\&.
.IP "-a"
Audible ping\&.
.IP "-A"
Only count addresses matching requested address (This *WILL*
break most things you do\&. Only useful if you are arpinging many
hosts at once\&. See arping-scan-net\&.sh for an example)\&.
.IP "-b"
Like -0 but source broadcast source address (255\&.255\&.255\&.255)\&.
Note that this may get the arping unanswered since it\&'s not normal behavior
for a host\&.
.IP "-B"
Use instead of host if you want to address 255\&.255\&.255\&.255\&.
.IP "-c \fIcount\fP"
Only send \fIcount\fP requests\&.
.IP "-d"
Find duplicate replies\&.
.IP "-F"
Don\&'t try to be smart about the interface name\&. (even if this
switch is not given, -i overrides smartness\&.
.IP "-h"
Displays a help message and exits\&.
.IP "-i \fIinterface\fP"
Use the specified interface\&.
.IP "-q"
Does not display messages, except error messages\&.
.IP "-r"
Raw output: only the MAC/IP address is displayed for each reply\&.
.IP "-R"
Raw output: Like -r but shows "the other one", can be combined with
-r\&.
.IP "-s \fIMAC\fP"
Set source MAC address\&. You may need to use -p with this\&.
.IP "-S \fIIP\fP"
Like -b and -0 but with set source address\&.
Note that this may get the arping unanswered if the target does not have
routing to the IP\&. If you don\&'t own the IP you are using, you may need to turn
on promiscious mode on the interface (with -p)\&. With this switch you can find
out what IP-address a host has without taking an IP-address yourself\&.
.IP "-t \fIMAC\fP"
Set target MAC address to use when pinging IP address\&.
.IP "-T \fIIP\fP"
Use -T as target address when pinging MACs that won\&'t
respond to a broadcast ping but perhaps to a directed broadcast\&.
.IP
\fIExample\fP: To check the address of MAC-A, use knowledge of MAC-B and IP-B\&.
.IP
$ arping -S <IP-B> -s <MAC-B> -p <MAC-A>
.IP "-p"
Turn on promiscious mode on interface, use this if you don\&'t
"own" the MAC address you are using\&.
.IP "-u"
Show index=received/sent instead of just index=received when
pinging MACs\&.
.IP "-v"
Verbose output\&. Use twice for more messages\&.
.IP "-w"
(arping 2\&.x only) Time to wait between pings, in microseconds\&.
.PP
.SH "BUGS"
.PP
You have to use -B instead of arpinging 255\&.255\&.255\&.255, and -b
instead of -S 255\&.255\&.255\&.255\&. This is libnets fault\&.
.PP
.SH "SEE ALSO"
.PP
\fBping(8)\fP, \fBarp(8)\fP, \fBrarp(8)\fP
.PP
.SH "AUTHOR"
.PP
Arping was written by Thomas Habets <thomas@habets\&.pp\&.se>\&.
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