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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


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    Presentation Transcript
    1. Firewalls

    2. Firewalls • Most widely sold solution for Internet security • Not a substitute for proper configuration management

    3. Types of Firewalls • IP packet level • TCP session level • Application level Dynamic packet filtering • NATs, Logging • Ingress vs. Egress filtering

    4. 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

    5. Packet Filters

    6. Network Topology and Address Spoofing

    7. Routing Filters • Perfect security if the node is completely unreachable

    8. Stateful Packet Filters (SPFs)

    9. Packet Filtering Performance

    10. Proxy Firewalls

    11. Circuit Level Proxy

    12. Application Proxy

    13. Caching Proxies

    14. Network Address Translation (NAT)

    15. Logging

    16. Firewall Pitfalls

    17. Where to Put FW

    18. Where (cont’d)

    19. DMZ

    20. Distributed Firewalls (DFWs)

    21. Switched Firewalls (Air-gap Technology)