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: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] 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. http://www.bbc.co.uk/ This e-mail (and any attachments) is confidential and may contain personal views which are not the views of the BBC unless specifically stated. If you have received it in error, please delete it from your system. Do not use, copy or disclose the information in any way nor act in reliance on it and notify the sender immediately. Please note that the BBC monitors e-mails sent or received. Further communication will signify your consent to this. ------------------------------------------------------------------------ - This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK & win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100&url=/ _______________________________________________ Nagios-users mailing list Nagios-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/nagios-users ::: Please include Nagios version, plugin version (-v) and OS when reporting any issue. ::: Messages without supporting info will risk being sent to /dev/null ------------------------------------------------------------------------- This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK & win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100&url=/ _______________________________________________ Nagios-users mailing list Nagios-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/nagios-users ::: Please include Nagios version, plugin version (-v) and OS when reporting any issue. ::: Messages without supporting info will risk being sent to /dev/null
