Overview Keepalive Gateway

Keepalive gateway sets the Ethernet interface to send the keepalive packet to the specified gateway address, used to monitor the reachability of the destination gateway. When the gateway is unreachable, close the interface IP protocol layer.

After configuring the keepalive gateway on one interface, the interface regularly sends the ARP request packet to the configured gateway address. When the interface does not receive the ARP response packet for successive N times (N is the retry times configured for the user), close the interface IP protocol layer. Until receiving the ARP response packet again, enable the interface IP protocol layer.