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CHAPTER 20 NAT 20.1 Overview NAT (Network Address Translation - NAT, RFC 1631) is the translation of the IP address of a host in a packet. For example, the source address of an outgoing packet, used within one network is changed to a different IP address known within another network. The figure below is a simple illustration of a NAT network. You want to assign ports 21-25 to one FTP, Telnet and SMTP server (A in the example), port 80 to another (B in the example) and assign a default server IP address of 192.168.1.35 to a third (C in the example). You assign the LAN IP addresses to the devices (A to D) connected to your NBG4615. The ISP assigns the WAN IP address. The NAT network appears as a single host on the Internet. All traffic coming from A to D going out to the Internet use the IP address of the NBG4615, which is 192.168.1.1. Figure 109 NAT Example A: 192.168.1.33 FTP, Telnet, SNMP Ports 21 to 25 LAN WAN B: 192.168.1.34 Port 80 192.168.1.1 C: 192.168.1.35 IP address assigned by ISP This chapter discusses how to configure NAT on the NBG4615. Note: You must create a firewall rule in addition to setting up NAT, to allow traffic from the WAN to be forwarded through the NBG4615. 20.1.1 What You Can Do • Use the General screen to enable NAT and set a default server (Section 20.2 on page 173). • Use the Application screen to change your NBG4615's port forwarding settings (Section 20.3 on page 174). NBG4615 User's Guide 171

Section	Page
NBG4615	1
Contents Overview	3
Table of Contents	5
User’s Guide	13
Introduction	15
1.1 Overview	15
1.2 Applications	15
1.3 Ways to Manage the NBG4615	15
1.4 Good Habits for Managing the NBG4615	16
1.5 LEDs	16
1.6 Wall Mounting	17
The WPS Button	19
2.1 Overview	19
ZyXEL NetUSB Share Center Utility	21
3.1 Overview	21
3.1.1 Quick Setup	21
3.1.2 Installing ZyXEL NetUSB Share Center Utility	21
3.2 The ZyXEL NetUSB Share Center Utility	22
3.2.1 The Menus	23
3.2.2 The ZyXEL NetUSB Share Center Configuration Window	25
3.2.3 The Auto-Connect Printer List Window	25
3.2.4 Exit the ZyXEL NetUSB Share Center Utility	26
Connection Wizard	29
4.1 Overview	29
4.2 Accessing the Wizard	29
4.3 Connect to Internet	29
4.3.1 Connection Type: DHCP	30
4.3.2 Connection Type: Static IP	31
4.3.3 Connection Type: PPPoE	32
4.3.4 Connection Type: PPTP	33
4.3.5 Connection Type: L2TP	34
4.4 Router Password	35
4.5 Wireless Security	36
4.5.1 Wireless Security: No Security	36
4.5.2 Wireless Security: WPA-PSK/WPA2-PSK	37
Introducing the Web Configurator	39
5.1 Overview	39
5.2 Accessing the Web Configurator	39
5.2.1 Login Screen	39
5.2.2 Password Screen	40
5.2.3 Home Screen	41
5.3 Resetting the NBG4615	43
5.3.1 How to Use the RESET Button	43
Monitor	45
6.1 Overview	45
6.2 What You Can Do	45
6.3 The Log Screen	45
6.3.1 View Log	46
6.4 BW MGMT Monitor	47
6.5 DHCP Table	47
6.6 Packet Statistics	48
6.7 WLAN Station Status	49
NBG4615 Modes	51
7.1 Overview	51
7.1.1 Web Configurator Modes	51
7.1.2 Device Modes	51
Easy Mode	53
8.1 Overview	53
8.2 What You Can Do	54
8.3 What You Need to Know	54
8.4 Navigation Panel	55
8.5 Network Map	55
8.6 Control Panel	56
8.6.1 Game Engine	57
8.6.2 Power Saving	57
8.6.3 Content Filter	58
8.6.4 Bandwidth MGMT	59
8.6.5 Firewall	60
8.6.6 Wireless Security	60
8.6.7 WPS	61
8.7 Status Screen in Easy Mode	62
Router Mode	65
9.1 Overview	65
9.2 Router Mode Status Screen	65
9.2.1 Navigation Panel	68
Access Point Mode	73
10.1 Overview	73
10.2 What You Can Do	73
10.3 What You Need to Know	73
10.3.1 Setting your NBG4615 to AP Mode	74
10.3.2 Accessing the Web Configurator in Access Point Mode	74
10.3.3 Configuring your WLAN, Bandwidth Management and Maintenance Settings	75
10.4 AP Mode Status Screen	75
10.4.1 Navigation Panel	77
10.5 LAN Screen	78
Universal Repeater Mode	81
11.1 Overview	81
11.2 What You Can Do	81
11.3 What You Need to Know	82
11.4 Setting your NBG4615 to Universal Repeater Mode	82
11.5 Universal Repeater Mode Status Screen	83
11.6 Universal Repeater Screen	85
11.6.1 No Security	86
11.6.2 Static WEP	87
11.6.3 WPA(2)-PSK	88
WISP Mode	89
12.1 Overview	89
12.2 What You Can Do	89
12.3 What You Need to Know	89
12.3.1 Setting your NBG4615 to WISP Mode	90
12.3.2 Accessing the Web Configurator in WISP Mode	90
12.4 WISP Mode Status Screen	91
12.5 Wireless LAN General Screen	94
12.5.1 Static WEP	95
12.5.2 WPA(2)-PSK	96
12.5.3 Site Survey Screen	97
WISP + UR Mode	99
13.1 Overview	99
13.2 What You Can Do	99
13.3 What You Need to Know	99
13.3.1 Setting your NBG4615 to WISP + UR Mode	100
13.3.2 Accessing the Web Configurator in WISP Mode	100
13.4 WISP + UR Mode Status Screen	101
Tutorials	105
14.1 Overview	105
14.2 Set Up a Wireless Network with WPS	105
14.2.1 Push Button Configuration (PBC)	105
14.2.2 PIN Configuration	106
14.3 Configure Wireless Security without WPS	107
14.3.1 Configure Your Notebook	109
14.4 Using Multiple SSIDs on the NBG4615	111
14.4.1 Configuring Security Settings of Multiple SSIDs	112
14.5 Connecting the NBG4615 (in Universal Repeater Mode) to an AP or Wireless Router	115
14.6 Connecting to USB Storage with the ZyXEL NetUSB Share Center Utility	119
14.6.1 Multiple Connections to the USB Device	119
14.7 Automatically Connecting to a USB Printer	121
Technical Reference	123
Wireless LAN	125
15.1 Overview	125
15.1.1 What You Can Do	125
15.1.2 What You Should Know	126
15.2 General Wireless LAN Screen	128
15.2.1 Guest WLAN	129
15.3 Wireless Security Screen	132
15.3.1 No Security	132
15.3.2 WEP Encryption	132
15.3.3 WPA-PSK/WPA2-PSK	134
15.4 MAC Filter	135
15.5 Wireless LAN Advanced Screen	136
15.6 Quality of Service (QoS) Screen	137
15.7 WPS Screen	137
15.8 WPS Station Screen	139
15.9 Scheduling Screen	139
15.10 WDS Screen	140
IPv6	143
16.1 Overview	143
16.1.1 What You Need to Know	143
16.2 The IPv6 Screen	144
16.2.1 IPv6 Connection: Ethernet	144
16.2.2 IPv6 Connection: DHCPv6	146
16.2.3 IPv6 Connection: Link-local only	147
WAN	149
17.1 Overview	149
17.2 What You Can Do	149
17.3 What You Need To Know	149
17.3.1 Configuring Your Internet Connection	150
17.3.2 Multicast	151
17.4 Internet Connection	151
17.4.1 Ethernet Encapsulation	151
17.4.2 PPPoE Encapsulation	153
17.4.3 PPTP Encapsulation	155
17.4.4 L2TP Encapsulation	157
17.5 Advanced WAN Screen	159
17.6 IGMP Snooping Screen	160
LAN	163
18.1 Overview	163
18.2 What You Can Do	163
18.3 What You Need To Know	163
18.3.1 IP Pool Setup	164
18.3.2 LAN TCP/IP	164
18.3.3 IP Alias	164
18.4 LAN IP Screen	164
18.5 IP Alias Screen	165
DHCP Server	167
19.1 Overview	167
19.1.1 What You Can Do	167
19.1.2 What You Need To Know	167
19.2 General	167
19.3 Advanced	168
NAT	171
20.1 Overview	171
20.1.1 What You Can Do	171
20.1.2 What You Need To Know	172
20.2 General	173
20.3 Application	174
20.4 Advanced	176
20.5 Technical Reference	177
20.5.1 NATPort Forwarding: Services and Port Numbers	177
20.5.2 NAT Port Forwarding Example	177
20.5.3 Trigger Port Forwarding	178
20.5.4 Trigger Port Forwarding Example	178
20.5.5 Two Points To Remember About Trigger Ports	179
DDNS	181
21.1 Overview	181
21.1.1 What You Need To Know	181
21.2 General	181
Static Route	183
22.1 Overview	183
22.2 IP Static Route Screen	183
RIP	185
23.1 Overview	185
23.2 RIP Screen	185
Firewall	187
24.1 Overview	187
24.1.1 What You Can Do	187
24.1.2 What You Need To Know	187
24.2 General	189
24.3 Services	189
Content Filtering	193
25.1 Overview	193
25.1.1 What You Need To Know	193
25.2 Content Filter	193
25.3 Technical Reference	195
25.3.1 Customizing Keyword Blocking URL Checking	195
Bandwidth Management	197
26.1 Overview	197
26.2 What You Can Do	197
26.3 What You Need To Know	198
26.4 General Screen	198
26.5 Advanced Screen	198
26.5.1 Rule Configuration: Application Rule Configuration	200
26.5.2 Rule Configuration: User Defined Service Rule Configuration	201
26.6 Monitor Screen	203
26.6.1 Predefined Bandwidth Management Services	203
Remote Management	205
27.1 Overview	205
27.2 What You Need to Know	205
27.2.1 Remote Management and NAT	205
27.2.2 System Timeout	205
27.3 WWW Screen	206
Universal Plug-and-Play (UPnP)	207
28.1 Overview	207
28.2 What You Need to Know	207
28.2.1 NAT Traversal	207
28.2.2 Cautions with UPnP	207
28.3 UPnP Screen	208
28.4 Technical Reference	208
28.4.1 Using UPnP in Windows XP Example	208
28.4.2 Web Configurator Easy Access	210
Maintenance	213
29.1 Overview	213
29.2 What You Can Do	213
29.3 General Screen	213
29.4 Password Screen	214
29.5 Time Setting Screen	215
29.6 Firmware Upgrade Screen	217
29.7 Configuration Backup/Restore Screen	218
29.8 Reset/Restart Screen	219
29.9 System Operation Mode Overview	219
29.10 Sys OP Mode Screen	221
Troubleshooting	223
30.1 Overview	223
30.2 Power, Hardware Connections, and LEDs	223
30.3 NBG4615 Access and Login	224
30.4 Internet Access	226
30.5 Resetting the NBG4615 to Its Factory Defaults	227
30.6 Wireless Router/AP Troubleshooting	227
30.7 USB Device Problems	229
30.8 ZyXEL Share Center Utility Problems	230
Pop-up Windows, JavaScript and Java Permissions	233
IP Addresses and Subnetting	243
Setting Up Your Computer’s IP Address	253
Wireless LANs	281
Common Services	295
IPv6	299
Legal Information	307