I am using Net::Ping to get a host's response time:

use strict;
use warnings;
use Net::Ping;

my $ping = Net::Ping->new('icmp',2);
$ping->hires;

my ($ret1,$delay1,undef) = $ping->ping($local);
print "($ret1,$delay1)\n";
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$local is the IP of a host on the local network.

I get $ret always == 1 (so the ping was "successful"). $delay1 can be 0, 2.0, or some reasonable delay. The host is not "close" so a 0 second delay is unreasonable. A delay of 2.0 clearly means the host is not reachable. What is the difference between 0 and 2 given that $ret is always 1?