Advanced Firewall (gateway add-on)
Upgrades your router's built-in firewall with flood protection — no extra box, but it slows the router down while it's on.
Technical profile
Gateway addon (no rack box). Adds stateful + SYN-cookie/rate-limit Protocol mitigation, folded into the gateway. Throttles the gateway's fabric to ~0.85× while active. The pre-box rung below a dedicated edge box.