Configuration Restrictions And Guidelines; Configuration Procedure; Configuring Arp Gateway Protection; Configuration Guidelines - HPE Moonshot 45Gc Security Configuration Manual

Configuration restrictions and guidelines

When you configure ARP scanning and fixed ARP, follow these restrictions and guidelines:
•
IP addresses in existing ARP entries are not scanned.
•
ARP scanning will 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. You can use this command again to convert
the dynamic ARP entries learned later to static.
•
Due to the limit on the total number of static ARP entries, some dynamic ARP entries might fail
the conversion.
•
To delete a 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 scanning and fixed ARP:
Step
1. Enter system view.
2. Enter Layer 3 Ethernet interface/Layer 3
Ethernet subinterface/VLAN
interface/Layer 3 aggregate
interface/Layer 3 aggregate
subinterface view.
3. Trigger an ARP scanning.
4. Return to system view.
5. Enable fixed ARP.

Configuring ARP gateway protection

Configure this feature on interfaces not connected to 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

Follow these guidelines when you configure ARP gateway protection:
•
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 works with ARP detection, MFF, ARP fast-reply, and ARP snooping,
ARP gateway protection applies first.
Command
system-view
interface interface-type interface-number
arp scan [ start-ip-address to end-ip-address ]
quit
arp fixup
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