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Security 7-25
A sample IP filter set
This section contains the settings for a filter set, called Basic Firewall,
which is part of the Netopia Router’s factory configuration. You can
add Basic Firewall to your connection profiles or the answer profile
(see “Connection profiles for ISDN and Leased lines” on page 2-13
and “Default profile” on page 2-39).
Basic Firewall blocks undesirable traffic originating from the WAN (in
most cases, the Internet), but passes all traffic originating from the
LAN. It follows the conservative “that which is not expressly permitted
is prohibited” approach: unless an incoming packet expressly
matches one of the constituent input filters, it will not be forwarded to
the LAN.
The five input filters and one output filter that make up Basic Firewall
are shown in the table below.
- Reference Guide 1
- Copyright 2
- Contents 3
- Chapter 1 9
- Introduction 9
- How to use this guide 10
- Netopia models 11
- Getting 12
- (PCMCIA) 13
- SmartPort 13
- Keyboard navigation 15
- 1-8 Reference Guide 16
- Chapter 2 17
- ISDN WAN Setup 18
- ISDN line configuration 18
- Leased line WAN Setup 21
- Leased line configuration 22
- Getting Started 23
- Getting Started Guide 34
- Frame Relay Parameters 43
- Frame Relay configuration 47
- Frame Relay DLCI configuration 50
- Default profile 55
- Call acceptance scenarios 63
- WAN IP Address Serving 64
- Scheduled connections 65
- Set Once-Only Schedule 69
- CSU Backup 71
- 2-56 Reference Guide 72
- Chapter 3 73
- Connecting Your Local Network 73
- EtherWave 77
- 10Base-T 79
- Thick and Thin Ethernet 80
- Chapter 4 81
- IP Setup 81
- Using NAT 82
- ■ Telnet uses port number 23 84
- ■ SNMP uses port number 161 84
- NAT guidelines 85
- IP setup 86
- Static routes 91
- IP address serving 96
- DHCP NetBIOS Options 100
- MacIP (KIP) Forwarding Setup 103
- 4-24 Reference Guide 104
- Chapter 5 105
- IPX Setup 105
- IPX setup 108
- IPX in the answer profile 111
- IPX filters 112
- ■ IPX packet filters 113
- ■ IPX packet filter sets 113
- ■ IPX SAP filters 113
- ■ IPX SAP filter sets 113
- IPX packet filters 114
- IPX packet filter sets 115
- IPX SAP filters 118
- IPX SAP filter sets 120
- IPX routing tables 123
- 5-20 Reference Guide 124
- Chapter 6 125
- AppleTalk Setup 125
- Routers and seeding 129
- EtherTalk Setup 133
- LocalTalk Setup 135
- AURP setup 136
- 6-18 Reference Guide 142
- Chapter 7 143
- Security 143
- Suggested security measures 144
- User accounts 144
- ■ Main Menu 145
- ■ Easy Setup 145
- ■ Advanced Configuration 145
- Add Name With Write Access 146
- Enter Name: 146
- ADD NAME/PASSWORD NOW CANCEL 146
- Telnet access 147
- About filters and filter sets 148
- How filter sets work 148
- APPROVED 149
- How individual filters work 151
- ■ Dest IP Addr = 0.0.0.0 155
- ■ Proto = TCP (or 6) 156
- ■ D. Port = 23 156
- ■ On? = Yes 156
- ■ Fwd = No 156
- Design guidelines 157
- Adding a filter set 159
- Viewing filter sets 165
- Modifying filter sets 166
- Deleting a filter set 166
- A sample IP filter set 167
- Chapter 8 173
- Token Security Authentication 173
- Using the SecurID token card 174
- Netopia Router 174
- Troubleshooting 181
- 8-10 Reference Guide 182
- Chapter 9 183
- Monitoring Tools 183
- General Status 184
- Current Status 185
- LED Status 186
- Statistics 187
- General Statistics 187
- DLCI Statistics 190
- Event Histories 191
- WAN Event History 193
- Routing Tables 194
- Call Accounting 197
- The SNMP Setup screen 201
- SNMP traps 202
- Chapter 10 205
- Utilities and Tests 205
- Tracing a route 211
- Upgrading the Netopia Router 212
- Restarting the system 212
- Factory defaults 213
- The ISDN loopback test 213
- Console configuration 215
- Using the console port 216
- Using the SmartPort 217
- Updating firmware 218
- Downloading configuration files 219
- Uploading configuration files 220
- 10-22 Reference Guide 226
- Appendix A 227
- Console connection problems 228
- ISDN problems 228
- Frame Relay problems 230
- Network problems 231
- Internal termination switch 232
- Technical support 233
- How to reach us 234
- A-10 Reference Guide 236
- Appendix B 237
- Understanding IP Addressing 237
- About IP addressing 238
- Subnets and subnet masks 239
- Distributing IP addresses 245
- Using address serving 246
- Internet 249
- Nested IP subnets 249
- Broadcasts 252
- Packet header types 252
- Appendix C 253
- ISDN Configuration Guide 253
- About SPIDs 254
- Example SPIDs 255
- Second directory number 255
- Switch-specific uses 255
- Backup number 256
- Dynamic B-channel usage 256
- C-6 Reference Guide 258
- Appendix D 259
- ISDN, DDS/ADN, and T1 Events 259
- Leased line events 260
- ISDN events 260
- ISDN event cause codes 261
- Appendix E 269
- Further Reading 269
- Glossary 271
- Committed Burst Size 272
- Excess Burst Size (Be) 275
- Committed Burst Size (Bc) 275
- FCS (Frame Check Sequence) 276
- Excess burst Size (Be) 276
- Interface device 277
- CRC (Cyclic 278
- Redundancy Check 278
- Encapsulation 280
- Class A, B, and C networks 280
- Frame Relay Frame 285
- U interface 287
- GL-20 Reference Guide 290
- GL-22 Reference Guide 292
- IN-2 Reference Guide 294
- IN-4 Reference Guide 296
- IN-6 Reference Guide 298
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