ZyXEL Communications ZyWALL 300 manual 18

Table of Contents

Chapter 18
ALG ........................................................................................................................................		265
18.1	ALG Introduction ..............................................................................................................	265
18.1.1 Application Layer Gateway (ALG) and NAT ...........................................................		265
18.1.2 ALG and Trunks .....................................................................................................		265
18.1.3 FTP ........................................................................................................................		266
18.1.4 H.323 ......................................................................................................................		266
18.1.5 RTP ........................................................................................................................		266
18.1.6 SIP .........................................................................................................................		267
18.2	Peer-to-Peer Calls and the ZyWALL ...............................................................................	268
18.2.1 VoIP Calls from the WAN with Multiple Outgoing Calls ..........................................		268
18.2.2 VoIP with Multiple WAN IP Addresses ...................................................................		268
18.3	ALG Screen .....................................................................................................................	269
18.4	WAN to LAN SIP Peer-to-peer Calls Example ................................................................	271

Part III: Firewall and VPN.....................................................................			275
Chapter 19
Firewall.................................................................................................................................			277
19.1		Firewall Overview ............................................................................................................	277
19.2		Firewall Rules ..................................................................................................................	278
	19.2.1 Rule Directions .......................................................................................................		278
	19.2.2 Firewall and VPN Traffic .........................................................................................		280
19.3		Firewall Rule Example Applications ................................................................................	280
19.4		Alerts ...............................................................................................................................	283
19.5		Asymmetrical Routes .......................................................................................................	283
	19.5.1 Virtual Interfaces and Asymmetrical Routes ..........................................................		283
19.6		Configuring the Firewall ...................................................................................................	284
	19.6.1 Edit a Firewall Rule ................................................................................................		286
19.7		Firewall Rule Configuration Example ..............................................................................	287
Chapter 20
IPSec VPN..............................................................................................................................			291
20.1		IPSec VPN Overview .......................................................................................................	291
	20.1.1 IPSec SA Overview ................................................................................................		292
	20.1.2 Additional Topics for IPSec SA ...............................................................................		294
20.2		VPN Related Configuration .............................................................................................	296
20.3		VPN Connection Screens ................................................................................................	297
	20.3.1 VPN Connection Summary ....................................................................................		297
	20.3.2 VPN Connection Add/Edit IKE ..............................................................................		298
	20.3.3 VPN Connection Add/Edit Manual Key ..................................................................		302
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			ZyWALL USG 300 User’s Guide