R211x-HP Flexfabric 11900 Security Configuration Guide

230
• ARP automatic scanning might take some time. To stop an ongoing scan, press Ctrl + C. Dynamic
ARP entries are created based on ARP replies received before the scan is terminated.
• The arp fixup command is a one-time operation and converts existing dynamic ARP entries to static
ones.
• The device has a limit on the total number of static ARP entries, including the manually configured
and the converted. As a result, some dynamic ARP entries might fail the conversion.
• To delete a specific static ARP entry converted from a dynamic one, use the undo arp ip-address
[ vpn-instance-name ] command. Use the reset arp all command to delete all ARP entries or the
reset arp static command to delete all static ARP entries.
Configuration procedure
To configure ARP automatic scanning and fixed ARP:
Ste
p
Command
1. Enter system view.
system-view
2. Enter Layer 3 Ethernet interface view or
VLAN interface view.
interface interface-type interface-number
3. Enable ARP automatic scanning.
arp scan [ start-ip-address to end-ip-address ]
4. Return to system view.
quit
5. Enable fixed ARP.
arp fixup
Configuring ARP gateway protection
Configure this feature on interfaces not connected with a gateway to prevent gateway spoofing attacks.
When such an interface receives an ARP packet, it checks whether the sender IP address in the packet is
consistent with that of any protected gateway. If yes, it discards the packet. If not, it handles the packet
correctly.
Configuration guidelines
When you configure ARP gateway protection, follow these guidelines:
• You can enable ARP gateway protection for a maximum of eight gateways on an interface.
• Do not configure both the arp filter source and arp filter binding commands on an interface.
• If ARP gateway protection operates with ARP detection or ARP snooping, ARP gateway protection
applies first.
Configuration procedure
To configure ARP gateway protection: