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2. Application-level gateway - Wikipedia

   en.wikipedia.org/wiki/Application-level_gateway

   An application-level gateway ( ALG, also known as application layer gateway, application gateway, application proxy, or application-level proxy) is a security component that augments a firewall or NAT employed in a mobile network. [1] [2] It allows customized NAT traversal filters to be plugged into the gateway to support address and port ...

3. Network address translation - Wikipedia

   en.wikipedia.org/wiki/Network_address_translation

   Application Layer Gateway (ALG) software or hardware may correct these problems. An ALG software module running on a NAT firewall device updates any payload data made invalid by address translation. ALGs need to understand the higher-layer protocol that they need to fix, and so each protocol with this problem requires a separate ALG.

4. NAT traversal - Wikipedia

   en.wikipedia.org/wiki/NAT_traversal

   NAT traversal. Network address translation traversal is a computer networking technique of establishing and maintaining Internet Protocol connections across gateways that implement network address translation (NAT). NAT traversal techniques are required for many network applications, such as peer-to-peer file sharing and voice over IP. [1]

5. Application firewall - Wikipedia

   en.wikipedia.org/wiki/Application_firewall

   Application firewall. An application firewall is a form of firewall that controls input/output or system calls of an application or service. It operates by monitoring and blocking communications based on a configured policy, generally with predefined rule sets to choose from. The two primary categories of application firewalls are network-based ...

6. Screened subnet - Wikipedia

   en.wikipedia.org/wiki/Screened_subnet

   A screened subnet is an essential concept for e-commerce or any entity that has a presence in the World Wide Web or is using electronic payment systems or other network services because of the prevalence of hackers, advanced persistent threats, computer worms, botnets, and other threats to networked information systems .

7. Port Control Protocol - Wikipedia

   en.wikipedia.org/wiki/Port_Control_Protocol

   Port Control Protocol ( PCP) is a computer networking protocol that allows hosts on IPv4 or IPv6 networks to control how the incoming IPv4 or IPv6 packets are translated and forwarded by an upstream router that performs network address translation (NAT) or packet filtering. By allowing hosts to create explicit port forwarding rules, handling of ...