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nagios 4.3.4_Packet loss = -150%
Posted: Wed Sep 27, 2017 2:07 am
by 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:
Code: Select all
PING OK - Packet loss = -150% , RTA = 0.77 ms
"-150%"?!! What does this message mean?!!
Thanks
Re: nagios 4.3.4_Packet loss = -150%
Posted: Wed Sep 27, 2017 12:01 pm
by scottwilkerson
Is it possible to post the full command that is run for this ping check?
Re: nagios 4.3.4_Packet loss = -150%
Posted: Mon Oct 02, 2017 1:22 am
by asiansuntrading
hi
Code: Select all
check_ping -H $HOSTADDRESS$ -w $ARG1$ -c $ARG2$ -p 5
-w 140.0,20%
-c 500.0,60%
thanks
Re: nagios 4.3.4_Packet loss = -150%
Posted: Mon Oct 02, 2017 11:38 am
by tmcdonald
Can you show us the result of pinging that device directly with the ping command? Just a simple ping -c 4 <remote ip>
Re: nagios 4.3.4_Packet loss = -150%
Posted: Tue Oct 03, 2017 1:49 am
by asiansuntrading
Hi
Code: Select all
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
Re: nagios 4.3.4_Packet loss = -150%
Posted: Tue Oct 03, 2017 10:16 am
by 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