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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 ...
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]
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.
Secure Computing, SnapGear firewall includes siproxd SIP proxy, Sidewinder 7 firewall includes a SIP proxy; SonicWall, supports SIP; ZyXEL ZyWALL P1, 2Plus, 5 UTM, 35 UTM, 70 UTM, 1050, USG 100, USG 200, USG 300, USG 1000 supports SIP-ALG; Libraries. oSIP; Test tools. Codenomicon Defensics: commercial test automation framework
In computing, a stateful firewall is a network-based firewall that individually tracks sessions of network connections traversing it. Stateful packet inspection, also referred to as dynamic packet filtering, [1] is a security feature often used in non-commercial and business networks.
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 ...
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