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Everything you need to know about Firewalls


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#1 Chachazz

Chachazz

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Posted 18 May 2006 - 05:03 AM

Firewall (networking)
From Wikipedia, the free encyclopedia

"In computing, a firewall is a piece of hardware and/or software which functions in a networked environment to prevent some communications forbidden by the security policy, analogous to the function of firewalls in building construction. A firewall is also called a Border Protection Device (BPD), especially in NATO contexts, or packet filter in BSD contexts. A firewall has the basic task of controlling traffic between different zones of trust. Typical zones of trust include the Internet (a zone with no trust) and an internal network (a zone with high trust). The ultimate goal is to provide controlled connectivity between zones of differing trust levels through the enforcement of a security policy and connectivity model based on the least privilege principle."

Contents
  1. Types of firewalls
  2. Network layer firewalls
  3. Application-layer firewalls
  4. Proxies
  5. Network address translation
  6. Management
  7. Implementations
  8. Use case scenario
  9. Online firewall check
  10. See also
  11. External links
Firewall Information @ Wikipedia