Packet loss reported by check_ping?

Jason Byrns jason-sourceforge at microlnk.net
Wed Dec 13 18:42:54 CET 2006


I agree it sounds logical that check_ping uses one packet, then however 
many you have set after that.  So thanks to everyone who pointed that out!

If I can get things straight so it doesn't do so many host checks, I'll 
probably revert back to the default number of ping packets.  (Or maybe 
go for 4 instead, to actually get my 20-40-60-80% results)

>> Also, along those lines...  I recently moved from the 1.2 Nagios to the 
>> more recent 2.4-2.5 Nagios.  Nagios 1.X seemed to only trigger a host 
>> check if a service check failed.  Nagios 2.X seems to ALWAYS run host 
>> checks in addition to service checks.  The fact that host checks are 
>> currently not run in parallel seems like this can really limit performance.
>>
>> Why did that behavior change?
> 
> It didn't. Or rather, it wasn't supposed to. I haven't seen anything of 
> the kind in any of our ~160 customers installations, so I'm fairly 
> certain this doesn't happen for all setups. What does your nagios.log 
> report on the ~15 lines prepending the host-check entry?

I should add that I'm using Monarch from the GrounworkOpensource.com 
guys.  I'm using their latest open source version, which I believe is 
4.5.11 or something like that.  It came with, um, some version of Nagios 
that I can't immediately identify.  Possibly as old as 2.0.  (How can I 
confirm the current version of Nagios?)

I've thought about upgrading the Nagios that comes with Monarch.  I've 
seen posts in their forums on how to do that, although they say it is 
unsupported.

Monarch imported our existing Nagios 1.X configuration, but it looks 
like this was one of a few mistakes it made.  I see it is indeed now set 
to have a check_interval for each host, as well as for each service. 
(Not like it used to be!)

I'll go update the Monarch config; sounds like that'll take care of that 
part.  I assume I just remove the value from the host's check_interval 
completely?

Here are the last few lines from nagios.log:

[1166030882] SERVICE ALERT: Authentication1;PING;OK;SOFT;2;PING OK - 
Packet loss = 0%, RTA = 25.15 ms
[1166030891] SERVICE ALERT: whi-whwt;SNMP2;UNKNOWN;SOFT;2;SNMP problem - 
No data received from host
[1166030901] SERVICE ALERT: 2river-210west;PING;OK;SOFT;2;PING OK - 
Packet loss = 0%, RTA = 40.62 ms
[1166030901] SERVICE ALERT: plum-rokap02;PING;CRITICAL;SOFT;1;PING 
CRITICAL - Packet loss = 50%, RTA = 19.04 ms
[1166030901] SERVICE ALERT: les-termap01;PING;CRITICAL;SOFT;1;PING 
CRITICAL - Packet loss = 50%, RTA = 25.81 ms
[1166030911] HOST ALERT: 2river-ap01;DOWN;SOFT;1;PING CRITICAL - Packet 
loss = 50%, RTA = 24.82 ms
[1166030913] HOST ALERT: 2river-ap01;DOWN;SOFT;2;PING CRITICAL - Packet 
loss = 50%, RTA = 25.33 ms
[1166030913] HOST ALERT: 2river-ap01;UP;SOFT;3;PING OK - Packet loss = 
0%, RTA = 12.41 ms
[1166030937] HOST ALERT: crn-ap04;DOWN;SOFT;1;PING CRITICAL - Packet 
loss = 50%, RTA = 15.69 ms
[1166030937] HOST ALERT: crn-ap04;UP;SOFT;2;PING OK - Packet loss = 0%, 
RTA = 17.17 ms
[1166030940] HOST ALERT: doug-pwr;DOWN;SOFT;1;PING CRITICAL - Packet 
loss = 50%, RTA = 23.90 ms
[1166030940] HOST ALERT: doug-pwr;UP;SOFT;2;PING OK - Packet loss = 0%, 
RTA = 17.42 ms
[1166030982] HOST ALERT: plat-ap01;DOWN;SOFT;1;PING CRITICAL - Packet 
loss = 50%, RTA = 12.12 ms
[1166030982] HOST ALERT: plat-ap01;UP;SOFT;2;PING OK - Packet loss = 0%, 
RTA = 11.75 ms
[1166031011] SERVICE ALERT: whi-whwt;SNMP2;UNKNOWN;HARD;3;SNMP problem - 
No data received from host
[1166031021] SERVICE ALERT: wmn-ap01;PING;CRITICAL;SOFT;1;PING CRITICAL 
- Packet loss = 50%, RTA = 7.19 ms
[1166031021] SERVICE ALERT: plum-rokap02;PING;OK;SOFT;2;PING OK - Packet 
loss = 0%, RTA = 53.29 ms
[1166031021] SERVICE ALERT: les-termap01;PING;OK;SOFT;2;PING OK - Packet 
loss = 0%, RTA = 62.16 ms
[1166031027] HOST ALERT: wmn-ap01;DOWN;SOFT;1;PING CRITICAL - Packet 
loss = 50%, RTA = 8.95 ms
[1166031027] HOST ALERT: wmn-ap01;UP;SOFT;2;PING OK - Packet loss = 0%, 
RTA = 9.09 ms
[1166031139] HOST ALERT: 2river-210west;DOWN;SOFT;1;PING CRITICAL - 
Packet loss = 50%, RTA = 28.75 ms
[1166031139] HOST ALERT: 2river-210west;UP;SOFT;2;PING OK - Packet loss 
= 0%, RTA = 15.85 ms
[1166031141] SERVICE ALERT: wmn-ap01;PING;OK;SOFT;2;PING OK - Packet 
loss = 0%, RTA = 9.76 ms

Thanks again for everybody's input!!  ;)

(Have I mentioned that I love Nagios?  I've used it *forever* -- 
remember NetSaint? -- and it's pretty hard to beat!)

-- 
Jason Byrns
Production Manager
System Administrator
http://www.MicroLnk.com/
402-328-8600 ext. 653

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