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[Firewalls-dnat-redirect]

A system designed to prevent unauthorized access to or from a private network. Firewalls can be implemented in both hardware and software, or a combination of both. Firewalls are frequently used to prevent unauthorized Internet users from accessing private networks connected to the Internet, especially intranets. All messages entering or leaving the intranet pass through the firewall, which examines each message and blocks those that do not meet the specified security criteria.

Provided in part by the http://lists.debian.org/debian-firewall/ list (debian-firewall@lists.debian.org).

[Firewalls-dnat-redirect] is one sticky point where hosts are in the same subnet as the dnated service they are trying to use, and need special attention to make connections work.