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Configuring Filters 9-15
Restricting User Access
Restricting User Access
Access filters enable you to restrict Telnet or rlogin connections to a specific host or
network, or a list of hosts or networks. You can create an access filter that restricts user
access to particular hosts.
Access filters work as follows:
1. The user specifies a host.
2. The host address is compared against the access filter.
3. If the address is permitted by the filter, the connection is established.
4. If the address is not permitted, the connection is denied unless access override is
enabled.
If you want a user to be able to override a port’s access filter, enable access override on
that port. In this case, the process is as follows:
1. Access is denied by the access filter.
2. The user is prompted for a user name and password.
3. The user is verified by the user table or RADIUS.
4. The access filter defined for this user is used to determine if the user has permission
to access the specified host.
To enable a user to override a port’s access filter with his or her own filter, use the
following command:
Command> set S0 access on
- PortMaster 1
- Copyright and Trademarks 2
- Disclaimer 2
- Contents 16
- About This Guide 17
- Additional References 19
- ITU-T Recommendations 21
- Document Conventions 22
- Document Advisories 23
- For the EMEA Region 24
- PortMaster Training Courses 24
- Introduction 27
- Preconfiguration Planning 28
- Configuration Tips 29
- Basic Configuration Steps 30
- How the PortMaster Works 33
- PortMaster Initialization 35
- On-Demand Connections 36
- Port Status and Configuration 37
- Setting the System Name 40
- Figure 3-1 42
- Configuring Default Routing 44
- Configuring Name Resolution 44
- Using the Host Table 45
- Setting the Name Service 45
- Setting the Name Server 46
- Setting the Domain Name 46
- Setting the Telnet Port 47
- Setting System Logging 47
- Setting the Loghost 48
- Configuring SNMP 51
- Examining the MIB Structure 52
- Figure 3-2 53
- 11820020 54
- PortMaster Serial Interfaces 55
- PortMaster T1/E1 Interfaces 57
- PortMaster Modem Table 58
- Setting SNMP Monitoring 59
- Viewing SNMP Settings 61
- Monitoring SNMP Alarms 61
- Displaying the Routing Table 61
- Setting Static Routes 62
- Uses for Static Netmasks 65
- Setting the ISDN Switch 68
- Applying Filters 70
- Setting IP Parameters 71
- Setting the IP Address 71
- Setting the Broadcast Address 72
- Setting the IPX Frame Type 74
- Asynchronous Port Uses 77
- Parity Checking 80
- Setting Databits 80
- Setting Flow Control 80
- Setting the Login Prompt 81
- Setting the Login Message 82
- Setting Port Security 82
- Setting a Port as the Console 83
- Setting the Port Type 85
- Setting the Login Service 86
- Setting the Terminal Type 87
- Setting the Device Service 90
- Telnet Device Service 91
- Netdata Device Service 91
- Network Dial-In-Only Access 92
- Network Dial-Out-Only Access 93
- 11820018 94
- PPP and SLIP Connections 95
- PAP and CHAP Authentication 95
- 11820019 96
- Synchronous Port Uses 103
- IRX Router 105
- 11820004 105
- Configuring WAN Port Settings 106
- General Synchronous Settings 106
- Setting Modem Control 108
- Setting Hangup Control 109
- Setting the Port Idle Timer 109
- Setting the Port IP Address 110
- Setting the Subnet Mask 111
- Configuring RIP Routing 111
- Setting Compression 113
- Configuring Dial-In Users 115
- Displaying User Information 116
- User Types 117
- Network Users 117
- Login Users 117
- Setting a Password 118
- Setting the Idle Timer 118
- Setting the Session Limit 118
- Configuring Network Users 118
- Setting the Protocol 119
- Setting the User IP Address 119
- Setting the MTU Size 121
- Setting Filters 123
- Configuring Login Users 124
- Setting the Login Host 124
- Creating a Location 131
- Setting the Connection Type 131
- On-Demand 132
- Continuous 132
- Manual Dial-Out 132
- Setting the Telephone Number 133
- Setting RIP Routing 135
- Setting the Dial Group 136
- Configuring Compression 136
- Setting Data over Voice 138
- Setting CHAP 138
- Setting Bandwidth-on-Demand 140
- Input Filters 141
- Output Filters 141
- Configuring Filters 143
- Filter Options 144
- Filter Organization 145
- 11820005 146
- Creating Filters 147
- Creating IP Filters 148
- Filtering TCP and UDP Packets 149
- Creating IPX Filters 149
- Displaying Filters 150
- Deleting Filters 150
- Example Filters 151
- Simple Filter 151
- Restrictive Internet Filter 155
- Restricting User Access 157
- Using Modems 159
- Modem Functions 160
- Setting the Port Speed 165
- Setting Parity 166
- Setting the Flow Control 166
- Hanging Up a Line 167
- Configuring the PortMaster 3 169
- Configuring Line Use 170
- Setting Channel Groups 170
- Setting the Channel Rate 171
- Setting the ISDN PRI Switch 173
- Setting the Framing Format 173
- Setting the Encoding Method 174
- Setting the Loopback 175
- Setting the Directory Number 175
- Using True Digital Modems 176
- Setting Digital Modems 176
- Using Channelized T1 178
- Why Use Channelized T1? 178
- Using the T1 Expansion Card 180
- Clocking 180
- Using Multichassis PPP 183
- Setting Multichassis PPP 183
- Using ISDN BRI 185
- Provisioning 187
- Configuring ISDN 188
- ISDN BRI Switch Types 188
- Setting the Switch Type 189
- Directory Number 190
- Information Elements (IEs) 190
- Multilink PPP 191
- Port Limits 192
- Data over Voice 192
- ISDN Port Configuration Tips 193
- Configuration Steps 193
- Internet 194
- PPP 0.0.0.0 PPP 0.0.0.0 194
- Configuring a Dial-In User 197
- Configuring Global Settings 200
- Testing the Setup 204
- Using Frame Relay 207
- PVCs and DLCIs 208
- Line Speed 208
- Port Speed 208
- CIR and Burst Speed 208
- Discarding Frames 209
- Ordering Frame Relay Service 209
- LMI Types 209
- Enabling LMI 211
- Enabling Annex-D 212
- Frame Relay Subinterfaces 218
- Configuring Subinterfaces 218
- Adding a Location 219
- Creating a DLCI Entry 219
- Displaying DLCI Entries 219
- Troubleshooting Subinterfaces 220
- 11820007 224
- Testing the Configuration 234
- 11820008 238
- System Link Network 250
- PortMaster Office Router 250
- 11820009 250
- Using Internet Connections 253
- 11820010 254
- Internet service provider 254
- Configuring Port Settings 256
- Providing Network Filtering 262
- Providing User Dial-In Access 265
- Example Configuration 267
- Connecting Modems 269
- Configuring Ports 270
- Configuring Users 272
- Dial-In Login Users 273
- Dial-In Network Users 273
- Accessing Shared Devices 277
- Network Device Configuration 278
- Telnet/rlogin/netdata 279
- Parallel Port (P0) Settings 284
- 11820012 288
- Networking Concepts 297
- IP Address Notation 298
- Class A Addresses 299
- Class B Addresses 299
- Network 300
- Host address 300
- Reserved IP Addresses 301
- Private IP Networks 301
- Network segment 302
- Node address 302
- Netmasks 303
- Managing Network Security 305
- ChoiceNet 306
- Glossary 311
- Command Index 347
- Subject Index 353
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