Nagios Support Forum

1.new install of Centos 5.5
2. 64bit (dual quad core, 16GB RAM)
3. manual installation
4. gnome is installed

Hi, we have an issue with some of the packet loss graphs on some hosts, the graphs will show 20-40 percent packet loss on a host that is having no packet loss at all. i have verified that there is no packet loss to these hosts by doing a continuous ping from the nagios server to the hosts that are having the issue. its not all the 3300 hosts that we monitor that are experiencing the problem just a few that we have noticed so far.

Is this a come and go issue, or is always reporting massive packet loss like that? Can you test if this what the plugin is reporting or if there is a disconnect within Nagios XI? If its a come and go issue, try and test it when nagios is reporting the packet loss.

./check_icmp <host ip that is being difficult>

If this is returning packet loss than there may be some other network issue at work here.

i did a ./check_icmp on a host that is currently showing packet loss on the graph and has no packet loss according to ./check_icmp

[root@fldmon libexec]# ./check_icmp 10.126.0.1
OK - 10.126.0.1: rta 73.513ms, lost 0%|rta=73.513ms;200.000;500.000;0; pl=0%;40;
80;;


Ping Results

--- 10.126.0.1 ping statistics ---
110 packets transmitted, 110 received, 0% packet loss, time 109096ms
rtt min/avg/max/mdev = 71.412/75.143/97.239/4.264 ms

You could try using the check_fping plugin instead and see if it yields different results over time.