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Understanding IP Addressing B-11
Nested IP subnets
Under certain circumstances, you may want to create remote subnets from the limited number of IP addresses
issued by your ISP or other authority. You can do this using connection profiles. These subnets can be nested
within the range of IP addresses available to your network.
For example, suppose that you obtain the Class C network address a.b.c.0 to be distributed among three
networks. This network address can be used on your main network, while portions of it can be subnetted to the
two remaining networks.
Note: The IP address a.b.c.0 has letters in place of the first three numbers to generalize it for this example.
The figure at left shows a possible network configuration following this scheme. The main network is set up with
the Class C address a.b.c.0, and contains Router A (which could be a Netopia R9100), a Netopia R9100, and a
number of other hosts. Router A maintains a link to the Internet, and can be used as the default gateway.
Internet
Router A
Router CRouter B
a.b.c.0
a.b.c.16
a.b.c.1
a.b.c.2
a.b.c.248
a.b.c.249
a.b.c.128
a.b.c.129
- R9100 Ethernet Router 1
- Part I: Getting Started 3
- Part III: Appendixes 8
- User’s Reference Guide 12
- Overview 13
- Features and capabilities 13
- How to use this guide 14
- 2-4 User’s Reference Guide 18
- Find a location 19
- What you need 20
- Netopia R9100 LED front panel 22
- Network Model 24
- 10Base-T 27
- Adding an external modem 29
- Ethernet 30
- Auxiliary Console Power 30
- 4-10 User’s Reference Guide 32
- Before running SmartStart 34
- Easy option 36
- Advanced option 37
- Sharing the Connection 38
- 5-14 User’s Reference Guide 46
- Configuring Telnet software 49
- Easy Setup console screens 51
- If your ISP supports DHCP 53
- More Easy Setup options 55
- WAN Ethernet Configuration 55
- IP Easy Setup 56
- 7-8 User’s Reference Guide 58
- Easy Setup is now complete 58
- WAN configuration 61
- System configuration screens 69
- System configuration features 71
- Network protocols setup 71
- Filter sets (firewalls) 72
- IP address serving 72
- Date and time 72
- Console configuration 72
- Security 73
- Upgrade feature set 73
- Installing the Syslog client 74
- 8-16 User’s Reference Guide 76
- ■ 10.0.0.3 to an FTP server 79
- ■ 10.0.0.4 to a Windows NT PC 79
- ■ 10.0.0.5 to a Windows 95 PC 79
- ■ Telnet uses port number 23 81
- ■ SNMP uses port number 161 81
- IP setup 82
- 9-8 User’s Reference Guide 84
- IP subnets 86
- Static routes 88
- IP Address Pools 95
- DHCP NetBIOS Options 97
- MacIP (KIP forwarding) setup 99
- IPX features 101
- IPX definitions 101
- IPX address 102
- NetBIOS 103
- IPX spoofing 103
- IPX setup screen 103
- IPX routing tables 105
- 10-6 User’s Reference Guide 106
- AppleTalk networks 107
- AppleTalk protocol 107
- Routers and seeding 109
- Installing AppleTalk 110
- Configuring AppleTalk 112
- EtherTalk setup 112
- LocalTalk setup 113
- AURP setup 114
- Quick View status overview 119
- General status 120
- Status lights 120
- Statistics & Logs 121
- General Statistics 122
- Event histories 123
- Routing tables 125
- Served IP Addresses 128
- Reset All Leases 129
- Release BootP Leases 129
- System Information 130
- The SNMP Setup screen 131
- SNMP traps 132
- SmartView 134
- SmartView overview 134
- Navigating SmartView 134
- Event history pages 135
- 12-18 User’s Reference Guide 136
- 12-20 User’s Reference Guide 138
- Suggested security measures 139
- User accounts 139
- Dial-in console access 141
- Telnet access 142
- About filters and filter sets 142
- How filter sets work 143
- How individual filters work 145
- Design guidelines 149
- Adding a filter set 151
- Viewing filter sets 154
- Modifying filter sets 155
- Deleting a filter set 155
- A sample IP filter set 155
- IPX filters 159
- IPX packet filters 160
- IPX packet filter sets 161
- IPX SAP filters 163
- IPX SAP filter sets 165
- Firewall tutorial 167
- General firewall terms 167
- Basic IP packet components 167
- Basic protocol types 167
- Firewall design rules 168
- Filter basics 170
- Example filters 171
- 13-36 User’s Reference Guide 174
- Trace Route 178
- Telnet client 179
- Factory defaults 180
- Updating firmware 181
- Downloading configuration files 182
- Uploading configuration files 183
- Restarting the system 186
- Configuration problems 189
- Console connection problems 190
- Network problems 190
- Power outages 191
- Technical support 192
- How to reach us 192
- A-6 User’s Reference Guide 194
- What is IP? 195
- About IP addressing 195
- Subnets and subnet masks 196
- Distributing IP addresses 199
- Configuration 201
- Using address serving 202
- Nested IP subnets 205
- Internet 205
- Broadcasts 207
- Packet header types 207
- B-14 User’s Reference Guide 208
- Network configuration 209
- Background 209
- Exported services 213
- Important notes 214
- Binary Conversion Table D-1 217
- D-2 User’s Reference Guide 218
- E-4 User’s Reference Guide 222
- 1300 ohms 223
- Description 224
- Power requirements 224
- Environment 224
- Software and protocols 225
- Agency approvals 225
- Regulatory notices 225
- Important safety instructions 226
- F-6 User’s Reference Guide 228
- 8 User’s Reference Guide 236
- 2 User’s Reference Guide 244
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