A security gateway and router offers protection against online security threats by enforcing company security policies and filtering malicious internet traffic in real-time. At a minimum, a secure gateway offers advanced firewall with VPN, deep packet inspection (DPI), Intrusion Prevention System (IPS) and Intrusion Detection System (IDS), threat management, DNS content and GeoIP filtering. Furthermore it will identify potential security threats and vulnerabilities, such as malware, worms, and other types of malicious traffic trying to scan your network for vulnerabilities.

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A firewall, in computers, is a network security system that monitors and controls incoming and outgoing network traffic based on predetermined security rules. A firewall typically establishes a barrier between a trusted internal network and untrusted external network, such as the Internet.