C
HAPTER
13
| Security Measures
ARP Inspection
– 377 –
Figure 202: Showing ACL Statistics
ARP I
NSPECTION
ARP Inspection is a security feature that validates the MAC Address
bindings for Address Resolution Protocol packets. It provides protection
against ARP traffic with invalid MAC-to-IP address bindings, which forms
the basis for certain “man-in-the-middle” attacks. This is accomplished by
intercepting all ARP requests and responses and verifying each of these
packets before the local ARP cache is updated or the packet is forwarded to
the appropriate destination. Invalid ARP packets are dropped.
ARP Inspection determines the validity of an ARP packet based on valid
IP-to-MAC address bindings stored in a trusted database – the DHCP
snooping binding database (see
"DHCP Snooping Configuration" on
page 418
). This database is built by DHCP snooping if it is enabled on
globally on the switch and on the required VLANs. ARP Inspection can also
validate ARP packets against user-configured ARP access control lists
(ACLs) for hosts with statically configured addresses (see
"Configuring
an ARP ACL" on page 371
).
C
OMMAND
U
SAGE
Enabling & Disabling ARP Inspection
◆
ARP Inspection is controlled on a global and VLAN basis.
◆
By default, ARP Inspection is disabled both globally and on all VLANs.
■
If ARP Inspection is globally enabled, then it becomes active only on
the VLANs where it has been enabled.
■
When ARP Inspection is enabled globally, all ARP request and reply
packets on inspection-enabled VLANs are redirected to the CPU and
their switching behavior handled by the ARP Inspection engine.
■
If ARP Inspection is disabled globally, then it becomes inactive for
all VLANs, including those where inspection is enabled.
Содержание ECS3510-10PD
Страница 1: ...Management Guide www edge core com 10 Port Layer 2 Fast Ethernet Switch...
Страница 2: ......
Страница 4: ......
Страница 48: ...CONTENTS 48...
Страница 68: ...SECTION I Getting Started 68...
Страница 78: ...CHAPTER 1 Introduction System Defaults 78...
Страница 96: ...CHAPTER 2 Initial Switch Configuration Managing System Files 96...
Страница 98: ...SECTION II Web Configuration 98...
Страница 118: ...CHAPTER 3 Using the Web Interface Navigating the Web Browser Interface 118...
Страница 150: ...CHAPTER 4 Basic Management Tasks Resetting the System 150...
Страница 196: ...CHAPTER 5 Interface Configuration VLAN Trunking 196 Figure 66 Configuring VLAN Trunking...
Страница 238: ...CHAPTER 7 Address Table Settings Configuring MAC Address Mirroring 238...
Страница 264: ...CHAPTER 8 Spanning Tree Algorithm Configuring Interface Settings for MSTP 264...
Страница 274: ...CHAPTER 9 Congestion Control Automatic Traffic Control 274...
Страница 288: ...CHAPTER 10 Class of Service Layer 3 4 Priority Settings 288...
Страница 304: ...CHAPTER 11 Quality of Service Attaching a Policy Map to a Port 304...
Страница 423: ...CHAPTER 13 Security Measures DHCP Snooping 423 Figure 229 Displaying the Binding Table for DHCP Snooping...
Страница 424: ...CHAPTER 13 Security Measures DHCP Snooping 424...
Страница 568: ...CHAPTER 14 Basic Administration Protocols OAM Configuration 568...
Страница 596: ...CHAPTER 15 IP Configuration Setting the Switch s IP Address IP Version 6 596...
Страница 614: ...CHAPTER 1 IP Services Configuring the PPPoE Intermediate Agent 614...
Страница 784: ...CHAPTER 20 System Management Commands Powered Device 784...
Страница 814: ...CHAPTER 22 Remote Monitoring Commands 814...
Страница 1008: ...CHAPTER 26 Interface Commands Power Savings 1008...
Страница 1022: ...CHAPTER 27 Link Aggregation Commands Trunk Status Display Commands 1022...
Страница 1052: ...CHAPTER 29 Congestion Control Commands Automatic Traffic Control Commands 1052...
Страница 1064: ...CHAPTER 31 UniDirectional Link Detection Commands 1064...
Страница 1070: ...CHAPTER 32 Address Table Commands 1070...
Страница 1130: ...CHAPTER 34 ERPS Commands 1130...
Страница 1172: ...CHAPTER 35 VLAN Commands Configuring Voice VLANs 1172...
Страница 1186: ...CHAPTER 36 Class of Service Commands Priority Commands Layer 3 and 4 1186...
Страница 1302: ...CHAPTER 38 Multicast Filtering Commands MVR for IPv6 1302...
Страница 1368: ...CHAPTER 40 CFM Commands Delay Measure Operations 1368...
Страница 1390: ...CHAPTER 42 Domain Name Service Commands 1390...
Страница 1448: ...CHAPTER 44 IP Interface Commands ND Snooping 1448...
Страница 1450: ...SECTION IV Appendices 1450...
Страница 1455: ...APPENDIX A Software Specifications Management Information Bases 1455 UDP MIB RFC 2013...
Страница 1456: ...APPENDIX A Software Specifications Management Information Bases 1456...
Страница 1464: ...APPENDIX D Compliances and Safety Statements CE Mark Declaration of Conformance for EMI and Safety EEC 1464...
Страница 1482: ...COMMAND LIST 1482...
Страница 1493: ......
Страница 1494: ...ECS3510 10PD E032014 ST R03 149100000179A...