ZyXEL Communications ZYWALL10 Chapter 6 Network Address Translation (NAT)

		ZyWALL 10 Internet Security Gateway
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

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