Take the 2-minute tour ×
Server Fault is a question and answer site for professional system and network administrators. It's 100% free, no registration required.

I am running a Nagios server on vmware 4.0 and every now and again during the day it alerts that some of servers cannot be reached via ICMP, clearly staging that a certain percentage of packets send are lost. This does not happen to all servers.

I know the servers are actually up, because I have done a parallel test from another windows box, just using simple ping and no packets were lost. I also now from the way we monitor out switch that no packets were lost on those particular ports.

Could anyone suggest a way to troubelshoot this further ? AT present this points to the nagios server itself loosing packets.

thanks

share|improve this question
    
what are the warning/critical thresholds set to? are you using check_ping or check_icmp? –  Keith Jul 24 '12 at 17:53

1 Answer 1

up vote 2 down vote accepted

The biggest cause of packet loss on VMs is failure to install the VMware tools package. Make sure that is installed and running always for all VMs.

share|improve this answer
    
I think this is the right track to go down - I doubt Nagios or the nagios VM are losing the packets, I think it's more likely a problem with the virtualised server interacting with the network through the physical machine. –  Bart B Jul 3 '12 at 10:43
    
thanks I will give that a go. I actually realised that it did not have the right version of vmware tools installed, so i've removed this - re-installed with correct version and installed the vmxnet drivers. Will give it 24 hours. thanks for the help :) –  Ankh2054 Jul 3 '12 at 12:52
    
just had another few ICMP packets drop. Any other ideas ? Could it the vmware installation ? –  Ankh2054 Jul 3 '12 at 13:28
1  
Usually if you've confirmed all is well with the VMware tools, then normal network troubleshooting applies, i.e. physical cable checks, try another NIC, etc. –  ThatGraemeGuy Jul 5 '12 at 13:12

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.