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Behind Firewall

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by noel_online

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I often hear some netadmin say that theirs is behind firewall. What exactly does "behind firewall" mean?

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by awilliam

"behind a firewall" usually means that some device is located on the inside/protected segment.

by amoisant

"behind the firewall" means that Protocol traffic such as IP or IPX goes first to a device (firewall) that inspects the traffic and allows or denies access, and then to the intended host machine. Example:

User: John

John sends a HTTP request to a website by typing in his browser www.yahoo.com, the site replies with the requested information, however before it reaches his machine, the firewall recieves and inspects the information before passing it along.

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