Egress filtering is a method of restricting a computer network’s traffic for the purpose of enforcing security. Outgoing packets are monitored as they pass through a router or gateway, and if they violate any security policies, they are denied egress: they are not allowed to exit the network.

In corporate networks that practice egress filtering, packets are usually restricted if they did not originate from a limited set of trusted internal servers. They might also be restricted by protocol — for instance, only HTTP, DNS, and e-mail packets might be allowed to leave the network, and others might be restricted.

Filter, Firewall, Network, Network terms, Security

  • Computer security help and support.
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