icmp ping status cacti allowed for every system if it is running as root? If UDP ping are okay why I need to pass throught firewall and only use ICMP ping?
For the first question:
Yes you do need privileges for 'cacti' for ICMP logs and status mapping.Â
Basically 'cacti' is suppose to run in the 'cron' job, to do that you might want to check out the configuration and installation on unix based system and follow the instructions.
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For the second question:
UDP and ICMP are two different protocols utilizing IP and have different application with respect to situations.
UDP allows multiple systems to send data to single IP
ICMP is used to communicate status and control message, hence it's blocked access by firewall
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