USRobotics NETServer/16 Instrukcja Użytkownika Strona 126
- Strona / 284
- Spis treści
- ROZWIĄZYWANIE PROBLEMÓW
- BOOKMARKI
Oceniono. / 5. Na podstawie oceny klientów
8-12 Packet Filters
TCP UDP Description
518 518 ntalk (new terminal chat)
- 520 RIP
540 540 uucp (UNIX to UNIX copy)
540 540 uucp-rlogin
543 543 klogin (Kerberized login)
1642 - PortMux daemon
- 1645 RADIUS security
- 1646 RADIUS accounting
Filtering RIP messages
If the NETServer is listening for or broadcasting RIP messages,
you should permit them (UDP dst eq 520) to pass in the appro-
priate direction(s).
Note that spurious RIP messages can disrupt your routing
tables. If you are listening for RIP messages on a given interface,
you may wish to consider filtering out RIP updates from
untrusted networks.
FTP Packet Filtering
FTP is one of the most difficult protocols to permit while still
protecting your network. The input and output filters must
permit two separate bi-directional connections, one initiated by
the client and one initiated by the host. However, they should
still be able to provide as much protection from outside attack-
ers as possible. To write such a filter, we’ll go through the FTP
process and write the appropriate lines as we go.
In the example below, we will permit all users on the local class
C network, 192.77.203.0 to initiate an FTP connection to any
other host on the Internet. However, incoming FTPs will be
denied.
Step 1 - Create two filters
Since we will be filtering both incoming and outgoing packets,
we must create two filters.
add filter ftp.in
add filter ftp.out
- 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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