I did some troubleshooting and found the following. -t option controls the actual -w option for /bin/ping if you add -t option in check_ping plugin then it add the -w option in /bin/ping command. If we don't put -t option then it automatically adds -w option with default 10 value so if we do '/bin/ping -n -U -w 10 -c 1 host A' the following is the output PING host A (x.x.x.x) 56(84) bytes of data. 64 bytes from <a href="http://128.59.60.22">128.59.60.22</a>: icmp_seq=4 ttl=59 time=2.95 ms --- <a href="http://unixrack5-ups1.cc.columbia.edu">unixrack5-ups1.cc.columbia.edu</a> ping statistics --- 4 packets transmitted, 1 received, 75% packet loss, time 3002ms rtt min/avg/max/mdev = 2.952/2.952/2.952/0.000 ms however if you do '/bin/ping -n -U -c 1 host A' we get the following output PING host A (x.x.x.x) 56(84) bytes of data. --- <a href="http://unixrack5-ups1.cc.columbia.edu">unixrack5-ups1.cc.columbia.edu</a> ping statistics --- 1 packets transmitted, 0 received, 100% packet loss, time 0ms Would it be possible not to add the -w option by default. Please advise on this. Thanks P. S - I am running rhel 5 with kernel version 2.6.18-128.2.1.el5 <div class="gmail_quote">On Wed, Aug 19, 2009 at 11:57 AM, shadih rahman <<a href="mailto:shadhin71@gmail.com">shadhin71@gmail.com</a>> wrote: <blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"> All, I have noticed that check_ping plugin is not processing the -p option properly. I have the following command definition define command{ command_name check-host-alive command_line $USER1$/check_ping -H $HOSTADDRESS$ t 45 -4 -w 3000.0,100% -c 3000.0,100% -p 1 } ./check_ping -H Hos A -p 1 -t 45 -4 -w 2000.0,30% -c 3000.0,40% PING CRITICAL - Packet loss = 50%, RTA = 2.50 ms|rta=2.498000ms;2000.000000;3000.000000;0.000000 pl=50%;30;40;0 If I am sending 1 packet, how is it possible to receive 50% packet loss. Please advise on this. Thanks -- Cordially, Shadhin Rahman </blockquote></div> -- Cordially, Shadhin Rahman