Netgear XCM8806 Chassis User Manual - Page 461
Denial of Service Protection, Configuring ARP Validation, Displaying ARP Validation Information
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NETGEAR 8800 User Manual Depending on the options specified when enabling ARP validation, the following validations are done. Note that the 'DHCP' option does not have to be specified explicitly, it is always implied when ARP validation is enabled. Configuring ARP Validation Before you configure ARP validation, you must enable DHCP snooping on the switch. To enable DHCP snooping, use the following command: enable ip-security dhcp-snooping {vlan} ports [all | ] violation-action [drop-packet {[block-mac | block-port] [duration | permanently] | none]}] {snmp-trap} For more information about DHCP snooping see, Configuring DHCP Snooping on page 448. By default, ARP validation is disabled. To enable and configure ARP validation, use the following command: enable ip-security arp validation {destination-mac} {source-mac} {ip} {vlan} [all | ] violation-action [drop-packet {[block-port] [duration | permanently]}] {snmp-trap} The violation action setting determines what action(s) the switch takes when an invalid ARP is received. Any violation that occurs causes the switch to generate an Event Management System (EMS) log message. You can configure to suppress the log messages by configuring EMS log filters. For more information about EMS, see the section Using the Event Management System/Logging on page 214. To disable ARP validation, use the following command: disable ip-security arp validation {vlan} [all | ] Displaying ARP Validation Information To display information about ARP validation, use the following command: show ip-security arp validation {vlan} The following is sample output from this command: Port Validation Violation-action 7 DHCP drop-packet, block-port for 120 seconds, snmp-trap 23 DHCP drop-packet, block-port for 120 seconds, snmp-trap Denial of Service Protection A Denial-of-Service (DoS) attack occurs when a critical network or computing resource is overwhelmed and rendered inoperative in a way that legitimate requests for service cannot succeed. In its simplest form, a Denial of Service attack is indistinguishable from normal heavy traffic. There are some operations in any switch or router that are more costly than Chapter 17. Security | 461
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