IP-Link definition on the USG

IP-Link indicates the link accessibility check. The firewall periodically sends ICMP echo requests or ARP requests to the specified destination IP address and waits for responses. If no response is received with the specified period of time, the firewall considers that the current link is faulty and performs subsequent link-related operations. If the firewall receives three consecutive responses over the original link within the subsequently-specified period of time, the firewall considers that the link fault is eliminated and performs subsequent link recovery-related operations.

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