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Security
Dynamic ARP Inspection
353 Cisco Small Business 300 Series Managed Switch Administration Guide
17
- No Snoop VLAN—DHCP Snooping is not enabled on the VLAN.
- Trusted Port—Port has become trusted.
- Resource Problem—TCAM resources are exhausted.
To see a subset of these entries, enter the relevant search criteria and click Go.
Dynamic ARP Inspection
ARP enables IP communication within a Layer 2 Broadcast domain by mapping IP
addresses to a MAC addresses.
A malicious user can attack hosts, switches, and routers connected to a Layer 2
network by poisoning the ARP caches of systems connected to the subnet and by
intercepting traffic intended for other hosts on the subnet. This can happen
because ARP allows a gratuitous reply from a host even if an ARP request was not
received. After the attack, all traffic from the device under attack flows through the
attacker's computer and then to the router, switch, or host.
The following shows an example of ARP cache poisoning.
ARP Cache Poisoning
- ADMINISTRATION 1
- Chapter 1: Getting Started 1 2
- Chapter 10: Smartport 144 5
- Chapter 13: Spanning Tree 218 8
- Chapter 15: Multicast 236 8
- Contents 10
- Chapter 17: Security 302 10
- Chapter 23: SNMP 446 15
- Getting Started 18
- Logging In 19
- HTTP/HTTPS 20
- Password Expiration 20
- Logging Out 21
- Interface Naming Conventions 23
- Window Navigation 24
- Management Buttons 26
- Status and Statistics 29
- Viewing Etherlike Statistics 30
- Viewing GVRP Statistics 32
- Viewing 802.1X EAP Statistics 33
- Viewing TCAM Utilization[ 34
- Managing RMON 35
- Configuring RMON History 37
- Defining RMON Events Control 39
- Viewing the RMON Events Logs 41
- Defining RMON Alarms 41
- Administration: System Log 45
- Setting System Log Settings 46
- Viewing Memory Logs 48
- RAM Memory 49
- Flash Memory 49
- System Files 51
- Files and File Types 52
- File Actions 53
- Active Image 58
- Copy/Save Configuration 65
- DHCP Server Options 67
- Auto Configuration Process 68
- Web Configuration 70
- Device Models 73
- System Information 75
- System Information: 76
- Rebooting the Device 79
- Routing Resources 81
- Monitoring Fan Status 82
- Pinging a Host 84
- Traceroute 86
- Administration: Time Settings 89
- System Time Options 90
- SNTP Modes 91
- Configuring System Time 92
- Adding a Unicast SNTP Server 94
- In Process 95
- Configuring the SNTP Mode 97
- Defining SNTP Authentication 97
- Time Range 98
- Absolute Time Range 99
- Recurring Time Range 100
- Administration: Diagnostics 101
- MSA-compatible SFPs 103
- STEP 3 Enter the parameters: 105
- Administration: Discovery 109
- LLDP and CDP 111
- Configuring LLDP 112
- LLDP Overview 113
- Setting LLDP Properties 114
- Editing LLDP Port Settings 115
- LLDP MED Network Policy 117
- Displaying LLDP Port Status 120
- Management Address 122
- MAC/PHY Details 122
- 802.3 Details 123
- 802.3 Link Aggregation 123
- MED Details 123
- Location Information 124
- Network Policy Table 124
- Port Details 125
- Basic Details 126
- Management Address Table 126
- 802.3 Power via MDI 127
- 802.1 VLAN and Protocol 128
- PPVID Table 128
- Accessing LLDP Statistics 129
- LLDP Overloading 130
- Configuring CDP 132
- CDP Configuration Workflow 133
- Viewing CDP Statistics 140
- Port Management 141
- Setting Port Configuration 142
- is disabled 143
- Configuring Link Aggregation 145
- Link Aggregation Overview 146
- Defining LAG Management 148
- Configuring LAG Settings 149
- Configuring LACP 151
- Configuring Green Ethernet 153
- 802.3az EEE Overview 155
- 802.3az EEE 156
- Smartport 161
- Overview 162
- What is a Smartport 163
- Smartport Types 163
- Special Smartport Types 165
- Smartport Macros 166
- Auto Smartport 169
- Error Handling 172
- Default Configuration 173
- Compatibility 173
- Common Smartport Tasks 173
- Smartport Properties 176
- Smartport Type Settings 177
- Smartport Interface Settings 178
- Port Type 179
- Unknown 179
- Built-in Smartport Macros 181
- Port Management: PoE 193
- PoE Operation 194
- PoE on the Device 195
- Configuring PoE Properties 196
- Configuring PoE Settings 197
- VLAN Management 201
- VLAN Description 202
- VLAN Roles 203
- VLAN Configuration Workflow 204
- STEP 3 Click Apply 205
- Creating VLANs 206
- Defining VLAN Membership 208
- Configuring Port to VLAN 209
- Configuring VLAN Membership 210
- GVRP Settings 211
- VLAN Groups 212
- MAC-based Groups 213
- Voice VLAN 215
- Dynamic Voice VLAN Modes 216
- Voice End-Points 217
- Defaults 217
- Voice VLAN Triggers 217
- Auto Voice VLAN 218
- Voice VLAN QoS 219
- Voice VLAN Constraints 220
- Voice VLAN Workflows 220
- Configuring Voice VLAN 221
- Configuring Telephony OUI 225
- Access Port Multicast TV VLAN 228
- IGMP Snooping 229
- Configuration 230
- Multicast TV Group to VLAN 230
- Workflow 232
- STEP 2 Click Add 233
- Spanning Tree 235
- STEP 2 Enter the parameters 236
- Multiple Spanning Tree 243
- Defining MSTP Properties 243
- Boundary 247
- Managing MAC Address Tables 249
- STEP 3 Enter the parameters 250
- Querying Dynamic Addresses 251
- Multicast 253
- Typical Multicast Setup 254
- Multicast Forwarding 255
- Defining Multicast Properties 256
- Adding MAC Group Address 258
- Configuring IGMP Snooping 261
- STEP 4 Enter the parameters 263
- MLD Snooping 264
- STEP 2 Define the following: 270
- IP Configuration 271
- Layer 2 IP Addressing 272
- IPv4 Interface 273
- Administration 275
- File Management 275
- DHCP Auto Configuration 275
- Dynamic IP Address 276
- Static IP Address 276
- IPv4 Routes 277
- Normal Age Out 278
- ARP Proxy 279
- UDP Relay/IP Helper 280
- DHCPv4 Snooping/Relay 280
- DHCPv4 Relay 281
- DHCPv4 in Layer 2 and Layer 3 281
- Transparent DHCP Relay 281
- Option 82 281
- DHCP Trusted Ports 287
- DHCP Default Configuration 289
- Configuring DHCP Work Flow 289
- DHCP Snooping/Relay 290
- Interface Settings 291
- STEP 3 Enter the fields: 292
- DHCP Server 293
- Dependencies Between Features 295
- DHCPv4 Server 296
- Network Pool 296
- Excluded Addresses 298
- Static Hosts 298
- Address Binding 300
- IPv6 Global Configuration 302
- IPv6 Interface 302
- DHCPv6 Client Details 304
- IPv6 Tunnel 305
- Configuring Tunnels 306
- Defining IPv6 Addresses 307
- IPv6 Default Router List 308
- Reachable 309
- Reachable Time 309
- Delay Time 309
- Incomplete 310
- Viewing IPv6 Route Tables 311
- DHCPv6 Relay 313
- Domain Name 314
- DNS Settings 315
- Search List 316
- Host Mapping 317
- Negative Cache 318
- No Response 318
- Security 319
- Defining Users 320
- Configuring TACACS+ 323
- Configuring a TACACS+ Server 325
- Configuring RADIUS 328
- Radius Workflow 329
- Active Access Profile 334
- STEP 6 Enter the parameters 335
- Defining Profile Rules 336
- SSL Server 338
- Configuring TCP/UDP Services 341
- Defining Storm Control 342
- Configuring Port Security 343
- Configuring 802.1X 346
- Dynamic VLAN Assignment (DVA) 347
- 802.1X Parameters Workflow 349
- Defining 802.1X Properties 349
- Defining Time Ranges 356
- Denial of Service Prevention 357
- Defense Against DoS Attacks 358
- Configuring DoS Prevention 359
- SYN Protection 361
- Martian Addresses 362
- SYN Filtering 363
- SYN Rate Protection 364
- ICMP Filtering 365
- IP Fragmented Filtering 365
- IP Source Guard 366
- Filtering 367
- Enabling IP Source Guard 368
- Binding Database 369
- Dynamic ARP Inspection 370
- ARP Defaults 372
- ARP Inspection Work Flow 373
- Introduction 377
- SSD Rules 378
- Elements of an SSD Rule 379
- NOTE Note the following: 381
- Default SSD Rules 382
- SSD Properties 383
- Passphrase 384
- Local Passphrase 384
- Configuration Files 386
- SSD Control Block 387
- Startup Configuration File 387
- Running Configuration File 388
- SSD Management Channels 391
- Configuring SSD 392
- Security: SSH Client 397
- Protection Methods 398
- Public/Private Keys 399
- Import Keys 399
- SSH Server Authentication 400
- SSH Client Authentication 401
- Before You Begin 402
- Common Tasks 402
- SSH User Authentication 404
- Security: SSH Server 407
- Access Control 413
- Defining IPv6-Based ACL 414
- Defining MAC-based ACLs 415
- Shutdown 416
- IPv4-based ACLs 418
- STEP 3 Click Add 419
- DSCP to Match 421
- IPv6-Based ACLs 422
- Defining an IPv6-based ACL 423
- STEP 5 Click Apply 425
- Defining ACL Binding 426
- Quality of Service 429
- QoS Features and Components 430
- QoS Workflow 431
- Configuring QoS - General 432
- Setting QoS Properties 433
- Configuring QoS Queues 434
- Strict Priority 435
- WRR Weight 435
- % of WRR Bandwidth 435
- Mapping DSCP to Queue 437
- Configuring Bandwidth 440
- QoS Basic Mode 444
- Configuring Global Settings 445
- QoS Advanced Mode 446
- Defining Class Mapping 451
- QoS Policers 452
- Defining Aggregate Policers 453
- Configuring a Policy 454
- Policy Class Maps 455
- Managing QoS Statistics 457
- Policer Statistics 458
- Viewing Queues Statistics 459
- STEP 4 Click Add 460
- STEP 5 Enter the parameters 460
- SNMP Versions and Workflow 463
- SNMPv1 and v2 464
- SNMP Workflow 464
- If you decide to use SNMPv3: 465
- Model OIDs 466
- SNMP Engine ID 467
- Configuring SNMP Views 469
- Creating SNMP Groups 470
- To create an SNMP group: 471
- Managing SNMP Users 472
- STEP 1 Click SNMP > Users 473
- Defining SNMP Communities 474
- Defining Trap Settings 476
- Notification Recipients 477
- SNMP Notification Filters 480
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