Now when a customer asks for a new guest WIFI network to be created, that network has access to everything unless the IT team remembers to create a deny firewall rule. You always have more deny rules than allow, sometimes many more making it difficult to audit.New VLANs automatically inherit the “ANY to ANY” rule, giving it unrestricted access to your network.But when doing your firewall setup Cisco Meraki does not support default denied, so your IT admin probably creates the rules with something like this: The answer is everything is blocked unless explicitly allowed. What traffic would an implicit deny firewall rule block? The challenge is Cisco Meraki firewall rules use the “ANY” object for both internal and WAN, so without ANY, that VLAN is unable to route to the internet. By starting with implicit deny, IT admins can protect against improper firewall configurations that will lead to unauthorized traffic traversing through your network. Implicit deny means all network traffic is denied unless allowed by your firewall rules. What is implicit deny and why should you care? This article applies to all Cisco Meraki firewall models and will teach you how to setup an implicit deny rule (and explain why all small business IT setups should be configured this way). How we setup firewalls for small business and what you will learn in this article
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