HP VPN Firewall Appliances Attack Protection Configuration Guide

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VLAN termination configured can use the gratuitous ARP packets to update their corresponding
MAC entries in time.
For more information about VRRP, see High Availability Web-based Configuration Guide.
Configuration restrictions and guidelines
When you configure periodic sending of gratuitous ARP packets, follow these restrictions and guidelines:
• You can enable periodic sending of gratuitous ARP packets on a maximum of 1024 interfaces.
• Periodic sending of gratuitous ARP packets takes effect only when the link of the enabled interface
goes up and an IP address has been assigned to the interface.
• If you change the interval for sending gratuitous ARP packets, the configuration is effective at the
next sending interval.
• The frequency of sending gratuitous ARP packets might be much lower than the sending interval set
by the user if this function is enabled on multiple interfaces, if each interface is configured with
multiple secondary IP addresses, or if a small sending interval is configured when the previous two
conditions exist.
Configuring periodic sending of gratuitous ARP packets
1. From the navigation tree, select Firewall > ARP Anti-Attack > Send Gratuitous ARP to enter the
Send Gratuitous ARP page.
Figure 47 Configuring periodic sending of gratuitous ARP packets
2. Specify on interface and interval for periodically sending gratuitous ARP packets.
Select an interface from the Standby Interface list, set its sending interval, and then click << to add
it to the Sending Interface list box.
To delete the combination of an interface and its sending interval, select it from the Sending
Interface list and click >>.
3. Click Apply.