Firewalls. Firewalls. Most widely sold solution for Internet security Not a substitute for proper configuration management. Types of Firewalls. IP packet level TCP session level Application level Dynamic packet filtering NATs, Logging Ingress vs. Egress filtering. OSI Model Layer.
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Firewalls • Most widely sold solution for Internet security • Not a substitute for proper configuration management
Types of Firewalls • IP packet level • TCP session level • Application level Dynamic packet filtering • NATs, Logging • Ingress vs. Egress filtering
OSI Model Layer Firewall Functionality Packet filtering, Address filtering, packet filtering firewall 7 - Application Application Level Proxies, forward and reverse proxies 6 - Presentation 5 - Session Stateful Firewall 4 – Transport – TCP/UDP Port filtering, circuit level proxy 3 – Network - IP 2 – Data Link 1- Physical Firewalls and OSI Layers
Routing Filters • Perfect security if the node is completely unreachable