ZyXEL Communications VANTAGE CNM 2.0 User Manual page 10

Vantage CNM 2.0 User's Guide
Chapter 12
Configuration > Firewall ...................................................................................... 166
12.1 Firewall Overview ...........................................................................................166
12.2 Types of Firewalls ..........................................................................................166
12.3 Introduction to ZyXEL's Firewall .....................................................................167
12.4 Stateful Inspection ..........................................................................................170
12.5 Firewall Configuration Screens ......................................................................177
Chapter 13
Configuration > Device Log ................................................................................ 186
13.1 Device Logs ...................................................................................................186
13.2 Device Logging Options .................................................................................187
13.3 Purge Logs .....................................................................................................189
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12.2.1 Packet Filtering Firewalls ......................................................................166
12.2.2 Application-level Firewalls ....................................................................166
12.2.3 Stateful Inspection Firewalls .................................................................167
12.3.1 Denial of Service ...................................................................................168
12.3.2 Basics ...................................................................................................168
12.3.3 Types of DoS Attacks ...........................................................................168
12.4.1 Stateful Inspection Process ..................................................................171
12.4.2 Stateful Inspection and the ZyXEL device ............................................172
12.4.3 TCP Security .........................................................................................172
12.4.4 UDP/ICMP Security ..............................................................................173
12.4.5 Upper Layer Protocols ..........................................................................173
12.4.6 Firewall Policies Overview ....................................................................173
12.4.7 Rule Checklist .......................................................................................175
12.4.8 Security Ramifications ..........................................................................175
12.4.9 Key Fields For Configuring Rules .........................................................176
12.4.9.1 Action ..........................................................................................176
12.4.9.2 Service ........................................................................................176
12.4.9.3 Source Address ...........................................................................176
12.4.9.4 Destination Address ....................................................................176
12.4.10 Alerts ...................................................................................................176
12.4.11 Services and Port Numbers ................................................................176
12.5.1 Firewall Summary Screen .....................................................................177
12.5.1.1 Ordering Rules ............................................................................177
12.5.2 DoS Settings .........................................................................................179
12.5.3 Add/Edit a Firewall Rule .......................................................................181
12.5.4 Add/Edit Source/Destination IP Addresses ..........................................183
12.5.5 Custom Ports ........................................................................................184
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