FireWalls. David Palmi and Scott Bauer. What is a Firewall?. “Firewall” means a fireproof wall. Narrow point of access for traffic entering or leaving a network. Positioned at the entry point to control access. First to see incoming, and last to see outgoing traffic.
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David Palmi and Scott Bauer
Fields in red are our focus.
Range for private addresses:
Class A: 10.0.0.0 to 10.255.255.255
Class B: 172.16.0.0 to 172.31.255.255
Class C: 192.168.0.0 to 192.168.255.255
240.0.0.0 to 247.255.255.255
What should your machine do if it receives a packet with a forged address?
Deny or Reject?
Packet Filter must be able to recognize the “start of connection” TCP packets.
A rule list should not allow start of connection from outside the system.
Only allow start of connection from the client side.