You'll most likely find that people tend to design their networks differenly based on requirements. There's really no hard and fast rule for a lot of what you're asking. That said, a few comments to help get you started: - Read up and understand where different firewall rules apply. For example MX L3 firewall rules don't apply to traffic transiting a site-to-site VPN. You would need site-to-site VPN firewall rules for this traffic. - Apply firewall rules as close to the source as possible - When planning the rules remember, someone has to maintain them. Complex rulesets quickly become overwhelming if they're not very well documented. Sometimes it's easier to be a little more open for the sake of simpler rules and thus fewer mistakes in creating and maintaining them. - Meraki has many places to put firewall rules (MR, MS, MX, group policy etc.) I suggest try bring consistent for wherever you place the rules. There's nothing worse than trying to troubleshoot a problem through a tonne of rules across multiple locations. - An "Allow all traffic going to internet" rule is basically "a deny traffic not going to the internet" rule - deny 10.0.0.0/8, 172.16.0.0/12, 192.168.0.0/16
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