WAN Connection Detection is for customizing how the router decides if the WAN interface is still alive or not, this will affect how long should the router wait before it activates the failover interface. The detection method can be set in WAN >> Internet Access >> WAN Index Details Page . Vigor Router provides five detection modes: PPP Detect, ARP Detect, Strict ARP Detect, Ping Detect and Always On. (*Strict ARP Detect will be supported in firmware version 3.9.1 and above versions)
The is the default setting for PPPoE WAN. The router sends an PPP LCP Echo request to the PPP server every 4 seconds when the connection is idle. If there's no response for 3 times, it will consider the PPP connection disconnected and send LCP Terminate to shutdown the connection. The PPP LCP Echo request sending interval can be tweaked by entering "internet -R
The is the default setting for Static IP or Dynamic IP WANs. The router sends an ARP request to the gateway every 5 seconds. If there's no response in 30 seconds and no any WAN packet received on the WAN interface, it will consider the WAN interface disconnected. (The time interval can be tweaked by entering "wan detect?" in the command-line interface.) In this mode, the WAN interface will be considered online as long as the gateway (modem) is still responding ARP or there are packets receiving on the WAN interface.
The is for Static IP or Dynamic IP WANs also. The router sends an ARP request to the gateway every 5 seconds. If there's no response from the gateway in 30 seconds, it will consider the WAN interface disconnected. (The time interval can be tweaked by entering "wan detect?" in the command-line interface.) In this mode, the WAN interface will be considered online as long as the gateway (modem) is still responding.
In this mode, the router tests the actual Internet connectivity. It sends ICMP request to the target IP address every second. If it doesn't get ICMP response after 10 requests, it will consider the WAN interface disconnected. In Ping Detect mode, the network administrator should enter at least one IP address for the ping target.
In the latest firmware, the network administrator may enter up to two IP addresses and use the Gateway IP as the target, then the WAN interface will only be considered disconnect when none of the targets responds. Furthermore, the interval between each ping request can be set to a number from 1 to 3600 seconds, and retry times can be a number from 1 to 255.
The WAN interface will never be considered disconnected. This mode is supported when the WAN interface is in "Static or Dynamic IP" mode.
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