Nagios Support Forum

Hello again,

So this seems strange to me and I'm not sure what is happening--I'll explain the situation here:


We are using Nagios to monitor our internal network as well as a few external hosts for various reasons. Suddenly, last night, Nagios started reporting "Critical - Network Unreachable" for 3 of the external hosts (while 3 others are still reporting normal). We are just checking the hosts with a Host Check and a check_ping service.

Here is the weird thing--When logged into the Nagios machine, I can do a ping hostname command and reach the external hosts that are reporting "Critical - Network Unreachable" just fine.


Any suggestions?

We are using Debian 6.0.5, and just upgraded yesterday morning to Nagios 3.4.1 from Nagios 3.3.1

Today is a big day for IPv6 as many sites enable support for it. This may be what is breaking your checks. Try adding '-4' to your command definitions to see if that fixes the problem.

That was the issue, thanks a ton man!

No problem.