ZyXEL Communications ZYWALL10 - Manual (Page 11)

ZyWALL 10 Internet Security Gateway
Table of Contents xi
5.1 IP Static Route Setup.................................................................................................................. 5-2
Chapter 6 Network Address Translation (NAT) ................................................................................... 6-1
6.1 Introduction ................................................................................................................................ 6-1
6.1.1 NAT Definitions ................................................................................................................. 6-1
6.1.2 What NAT Does ................................................................................................................. 6-1
6.1.3 How NAT works ................................................................................................................ 6-2
6.1.4 NAT Mapping Types.......................................................................................................... 6-3
6.1.5 SUA (Single User Account) Versus NAT .......................................................................... 6-4
6.1.6 NAT Application ................................................................................................................ 6-4
6.2 SMT Menus................................................................................................................................ 6-5
6.2.1 Applying NAT in the SMT Menus ..................................................................................... 6-5
6.2.2 Configuring NAT ............................................................................................................... 6-7
6.2.3 Address Mapping Sets and NAT Server Sets: .................................................................... 6-7
6.3 NAT Server Sets....................................................................................................................... 6-12
6.3.1 Multiple Servers behind NAT .......................................................................................... 6-13
6.3.2 Configuring a Server behind NAT ................................................................................... 6-13
6.4 Examples .................................................................................................................................. 6-15
6.4.1 Internet Access Only ........................................................................................................ 6-15
6.4.2 Example 2: Internet Access with an Inside Server ........................................................... 6-16
6.4.3 Example 3: General Case ................................................................................................. 6-17
6.4.4 Example 4: NAT Unfriendly Application Programs ........................................................ 6-20
Advanced Management....................................................................................................................................III
Chapter 7 Filter Configuration............................................................................................................... 7-1
7.1 About Filtering ........................................................................................................................... 7-1
7.1.1 The Filter Structure of the ZyWALL.................................................................................. 7-2
7.2 Configuring a Filter Set .............................................................................................................. 7-4
7.2.1 Filter Rules Summary Menu............................................................................................... 7-6
7.2.2 Configuring a Filter Rule.................................................................................................... 7-7
7.2.3 TCP/IP Filter Rule .............................................................................................................. 7-7
7.2.4 Generic Filter Rule ........................................................................................................... 7-11
7.3 Example Filter .......................................................................................................................... 7-13
7.4 Filter Types and NAT............................................................................................................... 7-15
7.5 Firewall..................................................................................................................................... 7-16
7.6 Applying a Filter and Factory Defaults .................................................................................... 7-16
7.6.1 LAN traffic ....................................................................................................................... 7-16