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8-20 Packet Filters
View a Packet Filter
If you want to check to view a specific packet filter, use the
following command:
show filter <name>
You’ll see the packet filter’s IP rules first, IPX rules second, and
then the SAP rules. The information you see might look some-
thing like this:
1 deny 0.0.0.0/0 0.0.0.0/0 tcp src eq 23
2 deny 0.0.0.0/0 0.0.0.0/0 tcp dst eq 23
3 permit
View the Packet Filter Table
To view the Packet Filter Table, use the following command:
show table filter
The information you see might look something like this:
internet.in internet.out internet.trc loginuser.in
loginuser.out loginsales
- NETServer/16 1
- NETServer/8 1
- 8100 North McCormick Blvd 2
- Skokie, Illinois 60076 2
- All Rights Reserved 2
- Table of Contents 3
- Chapter 8 Packet Filters 4
- Reference Section 5
- Warranty and Service 6
- Service and Support 7
- By voicemail: (708) 933-5200 8
- Chapter 1 9
- Overview 9
- Netmask Table 10
- IP Address Spoofing 10
- Accounting Servers 10
- Multiple Name Servers 11
- Randomized Hosts 11
- New Modem Port Features 12
- NETServer Overview 13
- 1-6 Overview 14
- How do I get there from here? 15
- Security 16
- Administrative Utilities 16
- Basic Installation 17
- Chapter 2 17
- TCP/IP Reference Material 18
- Accessing the Command Line 19
- Getting Started 20
- 3. Type the following: 21
- IP Configuration 23
- 2-8 Basic Installation 24
- IPX Configuration 25
- Final Steps 26
- Password 27
- IP and IPX Default Gateways 27
- 2-12 Basic Installation 28
- Save your work 29
- 2-14 Basic Installation 30
- Chapter 3 31
- Configuration Overview 31
- Dial In 32
- The Command Line 33
- Save your changes 34
- Reboot when necessary 34
- Quick Command Overview 35
- Global Configuration 36
- Net0 (LAN Port) Configuration 37
- Netmasks Table 37
- Packet Filter Table 38
- Port Configuration 39
- Routes Table 40
- SNMP Configuration 40
- Chapter 4 43
- IP Terminal Server Setup 43
- A Note About Hosts 45
- Configuring a Port 46
- Port Default - Host 47
- Port Default - Login Service 48
- Port Default - Terminal Type: 49
- Login Message 49
- Step 6 - Save your work 50
- Step 2 - Configure the user 51
- Step 4 - Save your work 53
- Example 1 54
- Port Setup 55
- User Table Setup 56
- Example 2 57
- Chapter 5 59
- Network Dial In Access 59
- 5-2 Network Dial In Access 60
- Configuration 61
- Network Dial In Access 5-5 63
- Step 4 - Save your changes 64
- Step 1 - Create a new user 65
- 5-8 Network Dial In Access 66
- Network Dial In Access 5-9 67
- IP Remote Access Case Study 69
- Connecting to the NETServer 72
- IPX Remote Access 73
- Chapter 6 75
- LAN-to-LAN Routing 75
- 6-2 LAN-to-LAN Routing 76
- LAN-to-LAN Routing 6-3 77
- NETServer Routing 78
- LAN-to-LAN Routing 6-5 79
- Static vs. Dynamic Routes 80
- How Packets are Routed 81
- Routing Procedure 82
- PAP/CHAP Authentication 83
- CHAP Setup for the NETServer 84
- Configuring the Port 86
- Step 3 - Save your work 87
- 6-14 LAN-to-LAN Routing 88
- 6-16 LAN-to-LAN Routing 90
- Dial Group Number 91
- 6-18 LAN-to-LAN Routing 92
- 6-20 LAN-to-LAN Routing 94
- Step 5 - Save your changes 95
- 6-22 LAN-to-LAN Routing 96
- Step 3 - Save your changes 98
- LAN-to-LAN Routing Case Study 99
- Setting Up NETServer A 100
- Setting Up NETServer B 101
- 6-28 LAN-to-LAN Routing 102
- Testing the Connection 103
- 6-30 LAN-to-LAN Routing 104
- Chapter 7 105
- Talking to the Modems 105
- 7-2 Talking to the Modems 106
- Talking to the Modems 7-3 107
- 7-4 Talking to the Modems 108
- Talking to the Modems 7-5 109
- Modem Initialization Scripts 110
- Talking to the Modems 7-7 111
- Initialization Script Example 112
- Talking to the Modems 7-9 113
- 7-10 Talking to the Modems 114
- Chapter 8 115
- Packet Filters 115
- Types of Filters 116
- Information Sources 117
- Adding Packet Filters 118
- Packet Filters 8-5 119
- Filter Rule Format 120
- Packet Filters 8-7 121
- TCP/IP packet filtering 122
- Packet Filters 8-9 123
- TCP and UDP parameters 124
- Standard Port Numbers 125
- Filtering RIP messages 126
- FTP Packet Filtering 126
- Packet Filters 8-13 127
- 8-14 Packet Filters 128
- Filtering ICMP packets 129
- IPX packet filtering 130
- Packet Filters 8-17 131
- SAP Rule Options 132
- Editing Packet Filters 133
- View a Packet Filter 134
- View the Packet Filter Table 134
- Chapter 9 135
- Administrative Tools 135
- Telnet Access Port 136
- The Dial Command 137
- Troubleshooting Commands 138
- Administrative Tools 9-5 139
- Ifconfig 140
- Administrative Tools 9-7 141
- 9-8 Administrative Tools 142
- Administrative Tools 9-9 143
- Traceroute 144
- The SHOW command 145
- 9-12 Administrative Tools 146
- Administrative Tools 9-13 147
- 9-14 Administrative Tools 148
- Administrative Tools 9-15 149
- 9-16 Administrative Tools 150
- Chapter 10 151
- Command Reference 151
- How to . . 152
- Global user parameters 153
- Randomize Hosts 154
- Global routing parameters 155
- Default Route 156
- NetBIOS Packet Propagation 157
- PAP Authentication 157
- Proxy ARP 157
- System Name 157
- Name Service 158
- Domain name 159
- DNS Cache Reset Time-out 159
- RADIUS security 160
- Accounting servers 161
- ICMP Logging 162
- Hosts Table 163
- Location Table 164
- Save Location Table Changes 165
- View the Location Table 165
- View a Particular Location 165
- Location Table Parameters 166
- IP Address 167
- IPX Network 167
- Protocol 168
- Compression 168
- Dial Group 169
- Maximum Ports 169
- Idle Time-out 170
- High Water Mark 170
- PPP Async Map 171
- Output Filter 172
- Input Filter 172
- Dial Script 172
- Command Reference 10-23 173
- LAN Port (Net0) Configuration 174
- LAN Port Parameters 175
- Configured Ethernet Media 176
- Interface Address 176
- Broadcast Address 177
- IPX Frame Type 178
- View the Ports Table 182
- Command Reference 10-33 183
- View an Individual Port 184
- Determining a Port’s Type 185
- 10-36 Command Reference 186
- Command Reference 10-37 187
- Dial In Port Parameters 188
- Login Prompt 189
- Security (Pass-Thru Login) 189
- User Login Port Parameters 190
- Login Service 192
- Terminal Type 193
- Hardwired Port Parameters 194
- Port Speed 197
- Databits 197
- Stopbits 197
- Flow Control 198
- Host Override 198
- Modem Control 198
- Routes Table Configuration 199
- Delete a Routes Table Entry 200
- Save Routes Table Changes 200
- View the IP Routes Table 200
- Viewing the IPX Routes Table 201
- IP Parameters 202
- IPX Parameters 203
- SNMP Table 204
- SNMP Table Parameters 205
- Read Hosts 206
- Write Hosts 206
- User Table 207
- Change a User’s Parameter(s) 208
- Delete a User 208
- Save User Table Changes 208
- View the User Table 208
- View a Particular User 208
- Login User Parameters 209
- 10-60 Command Reference 210
- Command Reference 10-61 211
- Network User Parameters 212
- 10-66 Command Reference 216
- Appendix A 217
- Technical Specifications 217
- Shipping and Storage 218
- Operating 218
- 10Base-T 220
- 10Base-2 (BNC) 221
- Cable Specifications 222
- Token Ring 223
- STP Connector 223
- UTP Connector 224
- Routing Support 225
- Administration 225
- Filtering & Security 225
- PPP Specific Features 226
- Industry Standards Support 226
- Client Dial-up Support 226
- Appendix B 229
- Addressing Schemes 229
- Address Classes 230
- Subnetting 230
- Addressing Schemes B-3 231
- Reserved Addresses 232
- Addressing Schemes B-5 233
- B-6 Addressing Schemes 234
- Addressing Schemes B-7 235
- B-8 Addressing Schemes 236
- Addressing Schemes B-9 237
- B-10 Addressing Schemes 238
- Appendix C 239
- Software Download 239
- Starting SDL 240
- SDL Command Syntax 241
- Optional -d Parameter 242
- Filename Prefixes 242
- Entering SDL Mode 243
- Upgrading NETServer Firmware 244
- Upgrading the Modem Firmware 245
- C-8 Software Download 246
- Error Messages 247
- C-10 Software Download 248
- Software Download C-11 249
- C-12 Software Download 250
- Software Download C-13 251
- C-14 Software Download 252
- Appendix D 253
- The Boot Process 253
- D-2 The Boot Process 254
- Appendix E 255
- Syslog Accounting 255
- Syslog System Messages 256
- Syslog Accounting E-3 257
- E-4 Syslog Accounting 258
- Syslog Accounting E-5 259
- E-6 Syslog Accounting 260
- Appendix F 261
- F-2 RADIUS 262
- Authentication Items 263
- Response Items 264
- RADIUS F-5 265
- F-6 RADIUS 266
- RADIUS F-7 267
- User Types 268
- RADIUS F-9 269
- F-10 RADIUS 270
- RADIUS F-11 271
- RADIUS Accounting 272
- Accounting Examples 273
- F-14 RADIUS 274
- Alphabetical Index 275
- 2 Index 276
- Index 3 277
- 4 Index 278
- Index 5 279
- 6 Index 280
- Index 7 281
- 8 Index 282
- Index 9 283
- 10 Index 284
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