nagios 4.3.4_Packet loss = -150%

[asiansuntrading]

Hi
We upgrade our nagios core from 4.3.2 to 4.3.3 and then 4.3.4 (with plugin 2.2.1); now we get an up notification for a node with this content:

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PING OK - Packet loss = -150% , RTA = 0.77 ms

"-150%"?!! What does this message mean?!!
Thanks

[scottwilkerson]

Is it possible to post the full command that is run for this ping check?

[asiansuntrading]

hi

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check_ping -H $HOSTADDRESS$ -w $ARG1$ -c $ARG2$ -p 5

-w 140.0,20%
-c 500.0,60%

thanks

[tmcdonald]

Can you show us the result of pinging that device directly with the ping command? Just a simple ping -c 4 <remote ip>

[asiansuntrading]

Hi

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4 packets transmitted, 0 received, 100% packet loss, time 3000ms

The device is critical, and note that message with "packet loss -150%" was for "up state" and now device is down.
Thanks

[scottwilkerson]

This can be caused by ping receiving duplicate packets. check_ping plugin receives the data directly from ping command

From the Ping Man Page

Duplicate and Damaged Packets

ping will report duplicate and damaged packets. Duplicate packets should never occur, and seem to be caused by inappropriate link-level retransmissions. Duplicates may occur in many situations and are rarely (if ever) a good sign, although the presence of low levels of duplicates may not always be cause for alarm.

Damaged packets are obviously serious cause for alarm and often indicate broken hardware somewhere in the ping packet's path (in the network or in the hosts).

https://linux.die.net/man/8/ping