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NETGEAR 8800 Chassis Switch CLI Manual Note: If you enable DHCP secured ARP on the switch, ARP learning continues, which allows insecure entries to be added to the ARP table. The default ARP timeout (configure iparp timeout) and ARP refresh (enable iparp refresh) settings do not apply to DHCP secured ARP entries. The switch removes DHCP secured ARP entries upon any DHCP release packet received from the DHCP client. Displaying ARP Information To display how the switch builds an ARP table and learns MAC addresses for devices on a specific VLAN and associated member ports, use the following command: show ip-security arp learning {vlan} To view the ARP table, including permanent and DHCP secured ARP entries, use the following command: show iparp { | | vlan | permanent} {vr } Example The following command enables DHCP secured ARP learning on port 1:1 of the VLAN learn and uses the default polling and retry intervals: enable ip-security arp learning learn-from-dhcp vlan learn ports 1:1 enable ip-security arp validation violation-action enable ip-security arp validation {destination-mac} {source-mac} {ip} {vlan} [all | ] violation-action [drop-packet {[block-port] [duration | permanently]}] {snmp-trap} Description Enables ARP validation for the specified VLAN and member ports. Syntax Description destination-mac source-mac ip Specifies that the switch checks the ARP payload for the MAC destination address in the Ethernet header and the receiver's host address in the ARP response. Specifies that the switch checks ARP requests and responses for the MAC source address in the Ethernet header and the sender's host address in the ARP payload. Specifies the switch checks the IP address in the ARP payload and compares it to the DHCP bindings database. If the IP address does exist in the DHCP bindings table, the switch verifies that the MAC address is the same as the sender hardware address in the ARP request. If not, the packet is dropped. 628 | Chapter 15. Security Commands

Section	Page
NETGEAR 8800 Chassis Switch CLI Manual	1
Contents	3
1. Command Reference Overview	6
Introduction	6
Audience	6
Structure of this Guide	7
Understanding the Command Syntax	7
Access Levels	7
Syntax Symbols	8
Syntax Helper	8
Object Names	9
Command Shortcuts	10
Port Numbering	10
Numerical Ranges	10
Line-Editing Keys	11
Command History	12
2. Commands for Accessing the Switch	13
3. Commands for Managing the Switch	57
SNMP	57
Telnet	58
TFTP	58
System Redundancy with Dual Management Modules Installed	58
Power Supply Management	58
Simple Network Time Protocol	59
4. Commands for Managing the NETGEAR 8800 Software	157
5. Commands for Configuring Slots and Ports on a Switch	190
6. Commands for Configuring LLDP	269
7. PoE Commands	300
Summary of PoE Software Features	300
8. Commands for Status Monitoring and Statistics	330
Event Management System	330
sFlow Statistics	331
RMON	331
9. VLAN Commands	425
10. FDB Commands	453
11. Commands for Virtual Routers	472
12. Policy Manager Commands	481
13. ACL Commands	487
14. QoS Commands	520
15. Security Commands	554
SSH	554
SSL	554
User Authentication	554
Denial of Service	555
16. Network Login Commands	679
17. STP Commands	737
STP	737
RSTP	737
MSTP	738
Spanning Tree Domains	738
Member VLANs	738
Carrier VLAN	738
Protected VLAN	739
STPD Modes	739
Encapsulation Modes	740
STP Rules and Restrictions	741
18. VRRP Commands	793
19. IP Unicast Commands	814
20. IPv6 Unicast Commands	904
21. RIP Commands	950
22. RIPng Commands	973
23. OSPF Commands	994
OSPF Edge Mode	995
24. OSPFv3 Commands	1036
OSPF Edge Mode	1037
25. BGP Commands	1075
26. IP Multicast Commands	1163
27. IPv6 Multicast Commands	1242
28. MSDP Commands	1261
29. vMAN (PBN) Commands	1296
A. Configuration and Image Commands	1306
B. Troubleshooting Commands	1345
Event Management System	1345

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628

Chapter 15.

Security Commands

NETGEAR 8800 Chassis Switch CLI Manual

Note:

If you enable DHCP secured ARP on the switch, ARP learning

continues, which allows insecure entries to be added to the ARP

table.

The default ARP timeout (

configure iparp timeout

) and ARP refresh (

enable iparp

refresh

) settings do not apply to DHCP secured ARP entries. The switch removes DHCP

secured ARP entries upon any DHCP release packet received from the DHCP client.

Displaying ARP Information

To display how the switch builds an ARP table and learns MAC addresses for devices on a

specific VLAN and associated member ports, use the following command:

show ip-security arp learning {vlan} <vlan_name>

To view the ARP table, including permanent and DHCP secured ARP entries, use the

following command:

show iparp {<ip_addre> | <mac> | vlan <vlan_name> | permanent} {vr <vr_name>}

Example

The following command enables DHCP secured ARP learning on port 1:1 of the VLAN learn

and uses the default polling and retry intervals:

enable ip-security arp learning learn-from-dhcp vlan learn ports 1:1

enable ip-security arp validation violation-action

enable ip-security arp validation {destination-mac} {source-mac} {ip} {vlan} <vlan_name> [all

| <ports>] violation-action [drop-packet {[block-port] [duration <duration_in_seconds> |

permanently]}] {snmp-trap}

Description

Enables ARP validation for the specified VLAN and member ports.

Syntax Description

destination-mac

Specifies that the switch checks the ARP payload for the MAC destination

address in the Ethernet header and the receiver’s host address in the ARP

response.

source-mac

Specifies that the switch checks ARP requests and responses for the MAC

source address in the Ethernet header and the sender’s host address in the

ARP payload.

Specifies the switch checks the IP address in the ARP payload and compares

it to the DHCP bindings database. If the IP address does exist in the DHCP

bindings table, the switch verifies that the MAC address is the same as the

sender hardware address in the ARP request. If not, the packet is dropped.