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Both are nice monitoring tools for Linux OS, monitor ports, sites, processes etc and generate caution via email/ SMS etc. I haven't work much on Zabbix but features ... Voir Plus
Nagois have a built in extension to verify the configuration, its called V. So you just start nagios with V extension like /usr/local/nagios/bin/nagios -v /usr/local/nagi ... Voir Plus
Network resource monitoring, Switches, servers etc. You can even monitor the RAM, CPU etc. its a open source powerful tool.
For me Nagios, since I built one from scratch to implementation.
I have used nagios in realtime so feel nagios is good tool to monitor network devices like windows server, linux server, switch, router and firewall