=head1 NAME

oping - send ICMP ECHO_REQUEST to network hosts

=head1 SYNOPSIS

B<oping> [B<-4> | B<-6>] [B<-c> I<count>] [B<-i> I<interval>] I<host> [I<host> [I<host> ...]]

B<oping> [B<-4> | B<-6>] [B<-c> I<count>] [B<-i> I<interval>] B<-f> I<filename>

B<noping> [B<-4> | B<-6>] [B<-c> I<count>] [B<-i> I<interval>] I<host> [I<host> [I<host> ...]]

B<noping> [B<-4> | B<-6>] [B<-c> I<count>] [B<-i> I<interval>] B<-f> I<filename>

=head1 DESCRIPTION

B<oping> uses ICMPv4 or ICMPv6 ECHO_REQUEST packets to measure a hosts
reachability and the network latency. In contrast to the original L<ping(8)>
utility B<oping> can send ICMP packets to multiple hosts in parallel and wait
for all ECHO_RESPONSE packets to arrive. In contrast to the B<fping> utility
(URL is listed in L<"SEE ALSO">) B<oping> can use both, IPv4 and IPv6
transparently and side by side.

B<noping> is an ncurses-based front-end to I<liboping> which displays ping
statistics online and highlights aberrant round-trip times if the terminal
supports colors.

=head1 OPTIONS

=over 4

=item B<-4>

Force the use of IPv4. 

=item B<-6>

Force the use of IPv6.

=item B<-c> I<count>

Send (and receive) I<count> ICMP packets, then stop and exit.

=item B<-i> I<interval>

Send one ICMP packet (per host) each I<interval> seconds. This can be a
floating-point number to specify sub-second precision.

=item B<-t> I<ttl>

Set the IP Time to Live to I<ttl>. This must be a number between (and
including) 1E<nbsp>andE<nbsp>255. If omitted, the value B<64> is used.

=item B<-I> I<address>

Set the source address to use. You may either specify an IP number or a
hostname. You B<cannot> pass the interface name, as you can with GNU's
L<ping(8)> - use the B<-D> option for that purpose.

=item B<-D> I<interface name>

Set the outgoing network device to use.

=item B<-f> I<filename>

Instead of specifying hostnames on the command line, read them from
I<filename>. If I<filename> is B<->, read from C<STDIN>.

If the real user ID (as returned by L<getuid(2)>) and the effective user ID (as
returned by L<geteuid(2)>) differ, the only argument allowed for this option is
"-" (i.E<nbsp>e. standard input). This is meant to avoid security issues when
I<oping> is installed with the SUID-bit.

=back

=head1 COLORS

If supported by the terminal, I<noping> will highlight the round-trip times
(RTT) using the colors green, yellow and red. Green signals RTTs that are in
the "expected" range, yellow marks moderately unusual times and times that
differ a lot from the expected value are printed in red.

The information used to categorize round-trip times is the I<average>
round-trip time and the I<standard deviation>. RTTs that differ from the
average by less than the standard deviation are considered to be "normal" and
are printed in green. Times that differ from the average more than the standard
deviation but less than twice the standard deviation are considered "moderately
unusual" and are printed in yellow. Times differing more than twice the
standard deviation from the average are considered to be "unusual" and are
printed in red.

=head1 SEE ALSO

L<ping(8)>, L<http://www.fping.com/>, L<liboping(3)>

=head1 AUTHOR

liboping is written by Florian octo Forster E<lt>octo at verplant.orgE<gt>.
Its homepage can be found at L<http://verplant.org/liboping/>.

(c) 2005-2010 by Florian octo Forster.