(Nagios-Ping)

[Paulus, Jake]

I have this issue as well. In my case I believe it exists because
servers are improperly multi-homed; this is a server configuration
problem, not a network one. I have brought this issue to the server
administrator's attention and they are unaware of any impact (probably
because TCP retries are hiding this) it causes to users and so have
chosen to take no action.

-Jake

-----Original Message-----
From: nagios-users-bounces at lists.sourceforge.net
[mailto:nagios-users-bounces at lists.sourceforge.net] On Behalf Of Paul
Weaver
Sent: Wednesday, August 27, 2008 8:38 AM
To: Nagios Users Mailinglist
Subject: Re: [Nagios-users] (Nagios-Ping)

> > Does anyone have this issue like me?
> > 
> > Additional Info:
> > 
> > PING WARNING - DUPLICATES FOUND! Packet loss = 0%, RTA = 1.61 ms
> 
> The obvious question to answer: What happens if you ping from 
> the nagios server by hand? If that results in duplicates as 
> well then Nagios is doing just fine and you have a network 
> problem to solve.
> 
> Duplicate replies can come from 2 systems having the same 
> address, faulty clusters duplicating packets, using 
> broadcasts addresses which makes every system in the 
> neighborhood react, faulty switches, ......

I ping about 150 servers, and I rarely get this DUPLICATES FOUND
warning. But I do. It's limited to devices on a given subnet (which is a
different subnet to the one nagios is on), and it's not readilly
repeatable. At bad times I might get one duplicate every 250 pings,
which are spread out over about 4 hours (5 pings per check, 15 checks
per hour when all OK). It rarely goes into a hard state, which requires
duplicated over a 90 second period. As it's the same subnet, I put it
down to a network fault -- perhaps due to the multiple paths between the
nagios network and this device network.


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