I've been running nagios for a few years now. I have about 10 installs, all are running nagios 3.0.3 compiled from source on Debian machines with plugins 1.4.12. I understand that check_telnet doesn't actually telnet to the device, but just checks that port 23 is available via check_tcp -p 23. Most of my install locations have devices that I would like to monitor over telnet. I was wondering if anyone is willing to share their knowledge about how to change the nagios/nagios-plugin behavior to telnet to an address, authenticate, pass commands, and store the returned values? Is that a job that is better handled by something like cacti, or is it completely beyond the scope of what nagios offers at present?
Thanks for your info,