In computer networking, egress filtering is a method of filtering electronic traffic that contributes to the security of a network and therefore makes it less prone to attacks from crackers. This article or section is in need of attention from an expert on the subject. ...
This method of filtering prevents crackers from using a machine or resources to launch attacks against other systems. It does this by monitoring and filtering packets that leave the internal network to external networks (Internet) via a router. Egress filtering helps ensure that unauthorized traffic never leaves the internal network. Cisco 1800 Router ERS-8600 In simple layman terms, a router is a device that determines the proper path for data to travel between different networks. ...
In a corporate network the initial default would be to block egress of all packets, then to only allow outward web, email and DNS traffic from specified servers. User workstations would then need to be set (typically automatically) to use the central mail server, web proxy etc. The effect of such a "restrictive firewall" is that each new application needing some internet access may require a firewall policy change - which is why it is an uncommon feature on consumer and very small business networks. A mail transfer agent or MTA (also called a mail server, or a mail exchange server in the context of the Domain Name System) is a computer program or software agent which transfers electronic mail messages from one computer to another. ... A proxy server is a computer network service which allows clients to make indirect network connections to other network services. ... Firewall may refer to: Firewall (construction), a physical barrier inside a building or vehicle, designed to limit the spread of fire, heat and structural collapse Firewall (networking), a logical barrier designed to prevent unauthorized or unwanted communications between sections of a computer network Firewall (film), a 2006 action film written...
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