R3721-F3210-F3171-HP High-End Firewalls Attack Protection Configuration Guide-6PW101

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Figure 50 Configuring periodic sending of gratuitous ARP packets
Table 16 Configuration items
Item Descri
p
tion
Sending Interface
Specify an 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 >>.
IMPORTANT:
• The firewall supports up to 1024 interfaces to send gratuitous ARP packets
periodically.
• With this feature enabled, an interface can periodically send gratuitous ARP
packets only after it is assigned with an IP address and the link comes up.
• If a sending interval is modified, the setting takes effect at the next interval.
• If a number of interfaces are enabled with this feature, or each interface has a
large amount of secondary IP addresses, or the sending intervals are very short
in the scenario where the above two conditions exist at the same time, the
frequency at which gratuitous ARP packets are sent may be far lower than your
expectation.
Configuring periodic sending of gratuitous ARP packet at the
CLI
Configuration guidelines
Follow these guidelines when you configure gratuitous ARP:
• 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.