This is commonly done by looking at packets in network traffic to see if they match signatures of attack patterns. An advanced security feature that scans traffic for malicious activity. You should have a plan to lifecycle equipment before the vendor stops providing updates. pfSense, OPNsense, AmpliFi, EdgeRouter, and UniFi do not require this–you pay for the hardware once but get free security updates for the life of the device (usually 5 to 10 years…or practically forever with pfSense/OPNsense). Many firewall vendors require you to maintain a licensing subscription to receive security updates. I prefer devices that can be configured to update themselves automatically. It is imperative to keep a router/firewall up to date. Below are a few choices from those product lines, but first, some things you need to know:
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