Netopia R2020 Instrukcja Użytkownika Strona 127
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Multiple Network Address Translation and IP Setup 10-1
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The Netopia R2020 uses Internet Protocol (IP) to communicate both locally and with remote networks. This
chapter shows you how to configure the Router to route IP traffic. You also learn how to configure the Router to
serve IP addresses to hosts on your local network.
Netopia’s SmartIP features IP address serving and Network Address Translation. This chapter describes how to
use the Network Address Translation feature of SmartIP and Multiple Network Address Translation (MultiNAT).
Note: When you configured your Netopia R2020 using SmartStart, Network Address Translation was enabled by
default. You have the option of disabling it, if you wish. This is done through the System Configuration screens
using Console-based Management.
This section covers the following topics:
■ “Overview” on page 10-1
■ “NAT configuration” on page 10-4
■ “Binding Map Lists and Server Lists” on page 10-18
■ “NAT Associations” on page 10-22
■ “MultiNAT Configuration Example” on page 10-24
■ “IP subnets” on page 10-29
■ “Static routes” on page 10-31
■ “IP address serving” on page 10-35
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NAT (Network Address Translation) is a means whereby one or more IP addresses and/or IP service ports are
re-mapped into other values. This
aliasing
serves two functions:
■ It allows the addresses of many computers to be represented by only one or a few addresses, saving you
money.
■ It can be used as a security feature by obscuring the true addresses of important machines from potential
hackers on the Internet.
To help you understand some of the concepts discussed here, it may be helpful to introduce some NAT
terminology.
The terms
mapping
or
remapping
refer to rules that translate one or more addresses on the Netopia Router's
LAN to another address or addresses on the other side of the Netopia Router's WAN link (typically the Internet).
The terms
private
and
internal
refer to addresses on the Netopia Router's LAN network that are protected or
obscured from the NAT remappings. These
NATed
addresses cannot be seen from the Internet side of the
Netopia Router's WAN connection.
- R2020 Dual Analog Router 1
- Part I: Getting Started 7 3
- Part III: Appendixes 15 10
- Overview 21
- Features and capabilities 21
- How to use this guide 22
- Find a location 23
- What you need 23
- 2 Telco 24
- 1 Ethernet 24
- Ethernet 26
- Line 2 Line 1 26
- Netopia R2020 LED front panel 28
- Before running SmartStart 29
- Easy option 32
- Advanced option 36
- Sharing the Connection 37
- 10Base-T 47
- Adding an external modem 48
- Configuring Telnet software 53
- Easy Setup console screens 55
- Beginning Easy Setup 57
- Easy Setup profile 57
- IP Easy Setup 58
- Easy Setup Security 60
- 7-6 User’s Reference Guide 68
- Deleting connection profiles 69
- System Configuration screens 69
- System Configuration features 70
- Network Protocols Setup 72
- Filter Sets (Firewalls) 72
- IP Address Serving 73
- Date and Time 73
- Console Configuration 73
- Security 74
- Upgrade Feature Set 74
- Installing the Syslog client 75
- Netopia R2020 back panel 79
- Scheduled connections 83
- ■ System 89
- ■ Connection 89
- 8-16 User’s Reference Guide 92
- Transit Internetwork 104
- User’s Reference Guide 108
- VPN QuickView 111
- ■ “PPTP Example” on page 9-19 121
- ■ “ATMP Example” on page 9-22 121
- 9-20 User’s Reference Guide 122
- 9-24 User’s Reference Guide 126
- Map Lists 130
- Server Lists 130
- Easy-PAT List 131
- Easy-Servers 131
- Add Server 139
- 10-16 User’s Reference Guide 142
- IP subnets 155
- Static routes 157
- IP address serving 161
- DHCP NetBIOS Options 163
- DHCP Relay Agent 166
- IPX Features 169
- IPX Definitions 169
- IPX address 170
- NetBIOS 171
- IPX Spoofing 171
- IPX setup 171
- IPX in the answer profile 173
- 11-6 User’s Reference Guide 174
- IPX routing tables 175
- 11-8 User’s Reference Guide 176
- AppleTalk networks 177
- AppleTalk protocol 177
- Routers and seeding 179
- Installing AppleTalk 180
- Configuring AppleTalk 182
- EtherTalk Setup 182
- LocalTalk Setup 183
- AURP setup 184
- 12-12 User’s Reference Guide 188
- Quick View status overview 189
- General Status 190
- Current Status 191
- Status lights 191
- Statistics & Logs 192
- General Statistics 192
- Event Histories 193
- Routing Tables 195
- Served IP Addresses 198
- Reset All Leases 199
- Release BootP Leases 199
- System Information 200
- The SNMP Setup screen 201
- SNMP traps 202
- 13-16 User’s Reference Guide 204
- Suggested security measures 205
- User accounts 206
- Dial-in Console Access 207
- Enable SmartStart/Web Server 208
- Telnet access 208
- About filters and filter sets 208
- How filter sets work 209
- How individual filters work 211
- Design guidelines 215
- Adding a filter set 217
- Viewing filter sets 220
- Modifying filter sets 221
- Deleting a filter set 221
- A sample IP filter set 221
- IPX filters 225
- IPX packet filters 226
- IPX packet filter sets 227
- IPX SAP filters 229
- IPX SAP filter sets 231
- Firewall tutorial 232
- General Firewall Terms 232
- Basic IP Packet Components 233
- Basic Protocol Types 233
- Firewall design rules 234
- Filter Basics 236
- Example Filters 237
- Token Security Authentication 240
- Securing network environments 240
- Using the SecurID token card 240
- Trace Route 249
- Telnet client 250
- Secure Authentication Monitor 250
- Factory defaults 251
- Updating firmware 252
- Downloading configuration files 253
- Uploading configuration files 254
- Restarting the system 257
- 15-14 User’s Reference Guide 258
- Configuration problems 261
- SmartStart Troubleshooting 262
- Console connection problems 262
- Network problems 262
- Power outages 263
- Technical support 263
- How to reach us 263
- SmartIP™ 267
- What is IP? 269
- About IP addressing 269
- Subnets and subnet masks 270
- Distributing IP addresses 273
- Configuration 275
- Using address serving 276
- Nested IP subnets 279
- Internet 279
- Broadcasts 281
- Packet header types 281
- C-14 User’s Reference Guide 282
- Binary Conversion Table D-1 283
- D-2 User’s Reference Guide 284
- E-4 User’s Reference Guide 288
- HD-15 DB-25 289
- Description 290
- Power requirements 290
- Environment 290
- Software and protocols 291
- Agency approvals 291
- Regulatory notices 291
- Important safety instructions 293
- F-6 User’s Reference Guide 294
- Trunk Line 297
- Class A, B, and C networks 300
- 8 User’s Reference Guide 304
- see IP addresses 307
- 2 User’s Reference Guide 312
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