Firewall Methods
Fire Wall : Filters & Gateways
- A proxy server allows no direct traffic through a firewall; packet filters do.
- A proxy server prevents direct communication with an outside network or internal sub-network.
- Packet filters permit or deny each network packet based on source and destination addresses, making this type of firewall at risk for spoofing.
- A proxy server uses a "connection filtering" authorization mechanism to determine whether a connection should be made. Before a connection is made,
- the proxy examines the data within packets rather than just the packet headers, virtually eliminating spoofing attempts.
- A proxy server hides internal networks from those outside the firewall. A hacker cannot obtain formation by scanning internal addresses.