Enter valid Network Ranges separated by commas.You may use an IP address, a Network range such as 192.168.1.0/24 or 192.168.1.0/255.255.255.0, or using wildcards such as 192.168.*.*
If Cacti can not determine the interface speed due to either ifSpeed or ifHighSpeed not being set or being zero, what maximum value do you wish on the resulting RRDfiles.
This is the location, on the web server where the RRDfiles and PNG files will be cached.This cache will be managed by the poller.Make sure you have the correct read and write permissions on this folder