Re: Log traffic options for IPv4 Policy
Log Security Events will only log Security (UTM) events (e.g. AV, IPS, firewall webfilter), providing you have applied one of them to a firewall (rule) policy. Log all traffic will do just that - personally, I would not enabled "Log all traffic" unless I need to troubleshoot something in near real time.
NSE4/FMG-VM64/FortiAnalyzer-VM/5.4/6.0 (FWF40C/FW92D/FGT200D/FGT101E)/ FAP220B/221C