ZyXEL Communications ZyXEL ZYWALL10 User Manual page 14

ZyWALL 10 Internet Security Gateway
14.1 SMT Menus...............................................................................................................................14-1
14.1.1 View Firewall Log ............................................................................................................14-2
14.1.2 Attack Types .....................................................................................................................14-2
14.2 The Big Picture - Filtering, Firewall and NAT .........................................................................14-5
14.3 Packet Filtering Vs Firewall......................................................................................................14-6
14.3.1 Packet Filtering: ................................................................................................................14-6
14.3.2 Firewall .............................................................................................................................14-7
Chapter 15 Introducing the ZyWALL Web Configurator..................................................................15-1
15.1 Web Configurator Login and Welcome Screens.......................................................................15-1
15.2 Enabling the Firewall ................................................................................................................15-3
15.3 E-mail........................................................................................................................................15-3
15.3.1 What are Alerts?................................................................................................................15-3
15.3.2 What are Logs? .................................................................................................................15-4
15.3.3 SMTP Error Messages ......................................................................................................15-6
15.3.4 Example E-mail Log .........................................................................................................15-6
15.4 Attack Alert...............................................................................................................................15-7
15.4.1 Threshold Values: .............................................................................................................15-7
15.4.2 Half-Open Sessions ...........................................................................................................15-8
Chapter 16 Creating Custom Rules ......................................................................................................16-1
16.1 Rules Overview.........................................................................................................................16-1
16.2 Rule Logic Overview ................................................................................................................16-1
16.2.1 Rule Checklist ...................................................................................................................16-1
16.2.2 Security Ramifications ......................................................................................................16-2
16.2.3 Key Fields For Configuring Rules ....................................................................................16-2
16.3 Connection Direction ................................................................................................................16-3
16.3.1 LAN to WAN Rules..........................................................................................................16-3
16.3.2 WAN to LAN Rules..........................................................................................................16-3
16.4 Rule Summary...........................................................................................................................16-4
16.5 Predefined Services...................................................................................................................16-7
16.5.1 Creating/Editing Firewall Rules......................................................................................16-10
16.5.2 Source and Destination Addresses ..................................................................................16-12
16.6 Timeout ...................................................................................................................................16-14
16.6.1 Factors Influencing Choices for Timeout Values............................................................16-14
Chapter 17 Custom Ports.......................................................................................................................17-1
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