ZyXEL Communications VANTAGE CNM User Manual page 12

Vantage CNM User's Guide
Chapter 12
Configuration > Firewall ...................................................................................... 170
12.1 Firewall Overview ...........................................................................................170
12.2 Types of Firewalls ..........................................................................................170
12.3 Introduction to ZyXEL's Firewall .....................................................................171
12.4 Stateful Inspection ..........................................................................................174
12.5 Firewall Configuration Screens ......................................................................181
Chapter 13
Configuration > Device Log ................................................................................ 190
13.1 Device Logs ...................................................................................................190
13.2 Device Logging Options .................................................................................191
13.3 Purge Logs .....................................................................................................193
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12.2.1 Packet Filtering Firewalls ......................................................................170
12.2.2 Application-level Firewalls ....................................................................170
12.2.3 Stateful Inspection Firewalls .................................................................171
12.3.1 Denial of Service ...................................................................................172
12.3.2 Basics ...................................................................................................172
12.3.3 Types of DoS Attacks ...........................................................................172
12.4.1 Stateful Inspection Process ..................................................................175
12.4.2 Stateful Inspection and the ZyXEL device ............................................176
12.4.3 TCP Security .........................................................................................176
12.4.4 UDP/ICMP Security ..............................................................................177
12.4.5 Upper Layer Protocols ..........................................................................177
12.4.6 Firewall Policies Overview ....................................................................177
12.4.7 Rule Checklist .......................................................................................179
12.4.8 Security Ramifications ..........................................................................179
12.4.9 Key Fields For Configuring Rules .........................................................180
12.4.9.1 Action ..........................................................................................180
12.4.9.2 Service ........................................................................................180
12.4.9.3 Source Address ...........................................................................180
12.4.9.4 Destination Address ....................................................................180
12.4.10 Alerts ...................................................................................................180
12.4.11 Services and Port Numbers ................................................................180
12.5.1 Firewall Summary Screen .....................................................................181
12.5.1.1 Ordering Rules ............................................................................181
12.5.2 DoS Settings .........................................................................................183
12.5.3 Add/Edit a Firewall Rule .......................................................................185
12.5.4 Add/Edit Source/Destination IP Addresses ..........................................187
12.5.5 Custom Ports ........................................................................................188
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