Leonardo Borda » kernel http://www.leonardoborda.com/blog A bit of everything and answers that really work! Thu, 06 Oct 2011 00:47:27 +0000 en hourly 1 http://wordpress.org/?v=3.2.1 Nagios plugin return codes http://www.leonardoborda.com/blog/nagios-plugin-return-codes/ http://www.leonardoborda.com/blog/nagios-plugin-return-codes/#comments Sat, 04 Apr 2009 03:48:06 +0000 Leo http://www.leonardoborda.com/blog/?p=121 Table 2. Plugin Return Codes

Numeric Value Service Status Status Description
0 OK The plugin was able to check the service and it appeared to be functioning properly
1 Warning The plugin was able to check the service, but it appeared to be above some “warning” threshold or did not appear to be working properly
2 Critical The plugin detected that either the service was not running or it was above some “critical” threshold
3 Unknown Invalid command line arguments were supplied to the plugin or low-level failures internal to the plugin (such as unable to fork, or open a tcp socket) that prevent it from performing the specified operation. Higher-level errors (such as name resolution errors, socket timeouts, etc) are outside of the control of plugins and should generally NOT be reported as UNKNOWN states.

link: http://nagiosplug.sourceforge.net/developer-guidelines.html#AEN35

]]> http://www.leonardoborda.com/blog/nagios-plugin-return-codes/feed/ 0 Ping does not respond after 8 or 9 successful replies. http://www.leonardoborda.com/blog/ping-does-not-respond-after-8-or-9-successful-replies/ http://www.leonardoborda.com/blog/ping-does-not-respond-after-8-or-9-successful-replies/#comments Sat, 04 Apr 2009 03:45:07 +0000 Leo http://www.leonardoborda.com/blog/?p=115 Today I had an interesting issue on Ubuntu 8.10.

We have 2 NICS on the server one has the following ip 172.16.20.10/16 and another one has 172.16.60.10/16. I know they are on the same network though but we had to do it in order to accomplish some routing issues.

So here is the problem:
When I try to ping our ISPs Gateway it succesful pings till the eighth or ninth reply and stops replying.
On ubuntu 6.10 it works fine.

So here is the solution:

Since we have 2 NICs with the same network address when the second one tries to reach a remote server the Kernel thinks it is a spoofing attack since by default it is enable source address verification against spoofing attacks.
So what you have to do is to change the rp_filter kernel parameter to 0 (zero).

1. Edit 10-network-security.conf
vi /etc/sysctl.d/10-network-security.conf
change to 0 (zero)
2. invoke-rc.d procps start

This is it!

Leonardo

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