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0175-firewall-tutorial

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0175-firewall-tutorial

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  1. Firewall Tutorial KAIST Dept. of EECS NC Lab.

  2. Contents ? What is Firewalls? ? Why Firewalls? ? Types of Firewalls ? Limitations of firewalls and gateways ? Firewalls in Linux

  3. What is Firewalls? firewall isolates organization’s internal net from larger Internet, allowing some packets to pass, blocking others. public Internet administered network firewall

  4. Why Firewalls? ? prevent denial of service attacks: ?SYN flooding: attacker establishes many bogus TCP connections, no resources left for “real” connections. ? prevent illegal modification/access of internal data. ?e.g., attacker replaces CIA’s homepage with something else ? allow only authorized access to inside network (set of authenticated users/hosts)

  5. Types of Firewalls ? packet-filtering firewall Communication Layers Application Presentation ?At the network layer Session Transport ? Application-level gateway Network Data Link ?At the application layer Physical

  6. Click here to download full PDF material

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