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C
HAPTER
14
| Security Measures
ARP Inspection
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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.
When ARP Inspection is disabled, all ARP request and reply packets
will bypass the ARP Inspection engine and their switching behavior
will match that of all other packets.
Disabling and then re-enabling global ARP Inspection will not affect
the ARP Inspection configuration of any VLANs.
When ARP Inspection is disabled globally, it is still possible to
configure ARP Inspection for individual VLANs. These configuration
changes will only become active after ARP Inspection is enabled
globally again.
The ARP Inspection engine in the current firmware version does not
support ARP Inspection on trunk ports.
C
ONFIGURING
G
LOBAL
S
ETTINGS
FOR
ARP
I
NSPECTION
Use the Security > ARP Inspection (Configure General) page to enable ARP
inspection globally for the switch, to validate address information in each
packet, and configure logging.
CLI R
EFERENCES
C
OMMAND
U
SAGE
ARP Inspection Validation
By default, ARP Inspection Validation is disabled.
Specifying at least one of the following validations enables ARP
Inspection Validation globally. Any combination of the following checks
can be active concurrently.
Destination MAC – Checks the destination MAC address in the
Ethernet header against the target MAC address in the ARP body.
This check is performed for ARP responses. When enabled, packets
Summary of Contents for DG-FS4526E
Page 4: ...ABOUT THIS GUIDE 4...
Page 34: ...CONTENTS 34...
Page 50: ...TABLES 50...
Page 52: ...SECTION I Getting Started 52...
Page 62: ...CHAPTER 1 Introduction System Defaults 62...
Page 80: ...CHAPTER 2 Initial Switch Configuration Managing System Files 80...
Page 82: ...SECTION II Web Configuration 82...
Page 100: ...CHAPTER 3 Using the Web Interface Navigating the Web Browser Interface 100...
Page 128: ...CHAPTER 4 Basic Management Tasks Resetting the System 128...
Page 166: ...CHAPTER 5 Interface Configuration VLAN Trunking 166...
Page 198: ...CHAPTER 6 VLAN Configuration Configuring VLAN Mirroring 198...
Page 516: ...CHAPTER 17 IP Services Displaying the DNS Cache 516...
Page 562: ...CHAPTER 19 Using the Command Line Interface CLI Command Groups 562...
Page 652: ...CHAPTER 22 SNMP Commands 652...
Page 660: ...CHAPTER 23 Remote Monitoring Commands 660...
Page 714: ...CHAPTER 24 Authentication Commands Management IP Filter 714...
Page 802: ...CHAPTER 27 Interface Commands 802...
Page 824: ...CHAPTER 29 Port Mirroring Commands RSPAN Mirroring Commands 824...
Page 846: ...CHAPTER 32 Address Table Commands 846...
Page 874: ...CHAPTER 33 Spanning Tree Commands 874...
Page 886: ...CHAPTER 34 ERPS Commands 886...
Page 928: ...CHAPTER 35 VLAN Commands Configuring Voice VLANs 928...
Page 942: ...CHAPTER 36 Class of Service Commands Priority Commands Layer 3 and 4 942...
Page 998: ...CHAPTER 38 Multicast Filtering Commands Multicast VLAN Registration 998...
Page 1022: ...CHAPTER 39 LLDP Commands 1022...
Page 1064: ...CHAPTER 40 CFM Commands 1064...
Page 1084: ...CHAPTER 42 Domain Name Service Commands 1084...
Page 1090: ...CHAPTER 43 DHCP Commands DHCP Client 1090...
Page 1122: ...CHAPTER 44 IP Interface Commands IPv6 Interface 1122...
Page 1124: ...SECTION IV Appendices 1124...
Page 1130: ...APPENDIX A Software Specifications Management Information Bases 1130...
Page 1152: ...COMMAND LIST 1152...
Page 1161: ......
Page 1162: ...DG FS4526E 042012 HW R01...