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ZYWALL 10/50 Internet Security Gateway
Table of Contents xiii
13.2.1 Rule Checklist .................................................................................................................. 13-1
13.2.2 Security Ramifications ..................................................................................................... 13-2
13.2.3 Key Fields For Configuring Rules.................................................................................... 13-2
13.3 Connection Direction............................................................................................................ 13-3
13.3.1 LAN to WAN Rules .........................................................................................................13-3
13.3.2 WAN to LAN Rules .........................................................................................................13-4
13.4 Rule Summary...................................................................................................................... 13-4
13.5 Predefined Services .............................................................................................................. 13-7
13.5.1 Creating/Editing Firewall Rules ..................................................................................... 13-10
13.5.2 Source and Destination Addresses.................................................................................. 13-11
13.6 Timeout .............................................................................................................................. 13-13
13.6.1 Factors Influencing Choices for Timeout Values........................................................... 13-13
Chapter 14 Custom Ports...................................................................................................................... 14-1
14.1 Introduction .......................................................................................................................... 14-1
14.2 Creating/Editing A Custom Port........................................................................................... 14-3
Chapter 15 Logs ..................................................................................................................................... 15-1
15.1 Log Screen............................................................................................................................ 15-1
Chapter 16 Example Firewall Rules..................................................................................................... 16-1
16.1 Examples .............................................................................................................................. 16-1
16.1.1 Example 1: Firewall Rule To Allow Web Service From The Internet ............................. 16-1
16.1.2 Example 2: Small Office With Mail, FTP and Web Servers............................................ 16-6
16.1.3 Example 3: DHCP Negotiation and Syslog Connection from the Internet..................... 16-12
Chapter 17 Content Filtering................................................................................................................ 17-1
17.1 Categories............................................................................................................................. 17