Notes

Firewalls

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Types of firewalls

  1. Packet filtering firewalls
    • Checks sender’s & recievers IP address and port number
    • Rules are written in access control list
    • Does not check payload in packet
    • Low security but cheaper
  2. Application / Proxy firewall
    • Proxy firewalls hides devices behind firewall
    • Proxy is in middle of communication
    • Web server only know proxy request
    • Also checks payload
    • Slower than Packer filtering
  3. Hybrid firewalls
    • Application firewall followed by packet filtering firewall
    • Most secure as best of both world
    • Used in mostly high security environments

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