False Positive Results for check_ping

[Robert V. Bolton]

I'm seeing a lot of false positive results from one of the host I'm
monitoring with the check_ping plugin. Looking at the logs I see various
degrees of packet lost for this host, but when a run the standard ping from
the command line don't have any packet loss. Does anyone have any insight
about this?

--- Section From Log File ---
Aug 20 08:55:29 monitor nagios: EXTERNAL COMMAND:
PROCESS_SERVICE_CHECK_RESULT;gw-ssb-moria;Ping Check IPv4;0;PING OK - Packet
loss = 50%, RTA = 0.57 ms
Aug 20 08:55:35 monitor nagios: PASSIVE SERVICE CHECK: gw-ssb-moria;Ping
Check IPv4;0;PING OK - Packet loss = 50%, RTA = 0.57 ms
Aug 20 08:56:36 monitor nsca[25608]: SERVICE CHECK -> Host Name:
'gw-ssb-moria', Service Description: 'Ping Check IPv4', Return Code: '0',
Output: 'PING OK - Packet loss = 37%, RTA = 0.56 ms'
Aug 20 08:56:38 monitor nagios: EXTERNAL COMMAND:
PROCESS_SERVICE_CHECK_RESULT;gw-ssb-moria;Ping Check IPv4;0;PING OK - Packet
loss = 37%, RTA = 0.56 ms
Aug 20 08:56:44 monitor nagios: PASSIVE SERVICE CHECK: gw-ssb-moria;Ping
Check IPv4;0;PING OK - Packet loss = 37%, RTA = 0.56 ms
Aug 20 08:57:44 monitor nsca[27186]: SERVICE CHECK -> Host Name:
'gw-ssb-moria', Service Description: 'Ping Check IPv4', Return Code: '0',
Output: 'PING OK - Packet loss = 0%, RTA = 1.19 ms'
Aug 20 08:57:48 monitor nagios: EXTERNAL COMMAND:
PROCESS_SERVICE_CHECK_RESULT;gw-ssb-moria;Ping Check IPv4;0;PING OK - Packet
loss = 0%, RTA = 1.19 ms
Aug 20 08:57:53 monitor nagios: PASSIVE SERVICE CHECK: gw-ssb-moria;Ping
Check IPv4;0;PING OK - Packet loss = 0%, RTA = 1.19 ms
Aug 20 08:58:14 monitor nsca[27765]: HOST CHECK -> Host Name:
'gw-ssb-moria', Return Code: '0', Output: 'PING OK - Packet loss = 0%, RTA =
0.55 ms'
Aug 20 08:58:16 monitor nagios: EXTERNAL COMMAND:
PROCESS_HOST_CHECK_RESULT;gw-ssb-moria;0;PING OK - Packet loss = 0%, RTA =
0.55 ms
Aug 20 08:58:23 monitor nagios: PASSIVE HOST CHECK: gw-ssb-moria;0;PING OK -
Packet loss = 0%, RTA = 0.55 ms
Aug 20 08:58:44 monitor nsca[28875]: SERVICE CHECK -> Host Name:
'gw-ssb-moria', Service Description: 'Ping Check IPv4', Return Code: '0',
Output: 'PING OK - Packet loss = 50%, RTA = 0.54 ms'
Aug 20 08:58:49 monitor nagios: EXTERNAL COMMAND:
PROCESS_SERVICE_CHECK_RESULT;gw-ssb-moria;Ping Check IPv4;0;PING OK - Packet
loss = 50%, RTA = 0.54 ms
Aug 20 08:58:53 monitor nagios: PASSIVE SERVICE CHECK: gw-ssb-moria;Ping
Check IPv4;0;PING OK - Packet loss = 50%, RTA = 0.54 ms
Aug 20 08:59:46 monitor nsca[30278]: SERVICE CHECK -> Host Name:
'gw-ssb-moria', Service Description: 'Ping Check IPv4', Return Code: '0',
Output: 'PING OK - Packet loss = 0%, RTA = 0.54 ms'
Aug 20 08:59:48 monitor nagios: EXTERNAL COMMAND:
PROCESS_SERVICE_CHECK_RESULT;gw-ssb-moria;Ping Check IPv4;0;PING OK - Packet
loss = 0%, RTA = 0.54 ms
Aug 20 08:59:54 monitor nagios: PASSIVE SERVICE CHECK: gw-ssb-moria;Ping
Check IPv4;0;PING OK - Packet loss = 0%, RTA = 0.54 ms

--- Results From Ping Command ---
PING 172.30.0.3 (172.30.0.3) 56(84) bytes of data.
64 bytes from 172.30.0.3: icmp_seq=1 ttl=255 time=0.531 ms
64 bytes from 172.30.0.3: icmp_seq=2 ttl=255 time=0.563 ms
64 bytes from 172.30.0.3: icmp_seq=3 ttl=255 time=0.506 ms
64 bytes from 172.30.0.3: icmp_seq=4 ttl=255 time=0.554 ms
64 bytes from 172.30.0.3: icmp_seq=5 ttl=255 time=0.505 ms
64 bytes from 172.30.0.3: icmp_seq=6 ttl=255 time=0.561 ms
64 bytes from 172.30.0.3: icmp_seq=7 ttl=255 time=0.534 ms
64 bytes from 172.30.0.3: icmp_seq=8 ttl=255 time=0.499 ms
64 bytes from 172.30.0.3: icmp_seq=9 ttl=255 time=0.496 ms
64 bytes from 172.30.0.3: icmp_seq=10 ttl=255 time=0.554 ms
64 bytes from 172.30.0.3: icmp_seq=11 ttl=255 time=0.512 ms

--- 172.30.0.3 ping statistics ---
11 packets transmitted, 11 received, 0% packet loss, time 10000ms
rtt min/avg/max/mdev = 0.496/0.528/0.563/0.035 ms

-- 
Robert V. Bolton
Email: robert at robertvbolton.com
Web: http://robertvbolton.com
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