Network Firewall

Computer networks are more like any other kind of inhabited space networks have assets, they have participants and they have rules. Some computer networks are private and others public, some contain sensitive assets and others less so and so on. Generally user and traffic residing on one network need to be a protected from users and traffic on a different but connected network. Yet all these networks are inter-connected to a degree even if they are only connected via sneakernet and this interconnectedness is both a critical feature and an emergent vulnerability.

So it is not to surprising that the idea for "fire wall" functionality as applied to computer networks has been around since the early days of the Internet, and saw serious development in the 1990.It was eventually recognized that the very same problems applied in networks as existed in construction; containment and isolation. Network engineers began working with routers and packet filters as early containment technology, and from these efforts eventually emerged the sophisticated purpose built network firewalls common in computer cloud data centers and home computers.