Nagios Support Forum

Hi everyone!

I have two problems with Nagios Core. I have a Debian server and I try to monitor a Mikrotik router:

check_mrtgtraf: Unable to open MRTG log file
Usage check_mrtgtraf -F <log_file> -a <AVG

SNMP problem - No data received from host
CMD: /usr/bin/snmpget -t 1 -r 5 -m RFC1213-MIB -v 1

Let's start with the mrtgtraf first:

Please post the output of the following:
For the SNMP problem can you run nmap (from the Nagios machine) against the server in question to see if it is reachable? Run this cmd on your Nagios box:
nmap -sU -p 161 hostname\IP

*Keep in mind that we may have open a new thread for the SNMP problem should we have to do extensive troubleshooting for either issue.