Hi,
I am trying to configure failover using WAN2 and WAN3 (4G dongle).
currently connected my ADSL cable to BT router, and LAN cable from BT router to Vigor LAN port 4, and then connected USB 4G dongle as failover.

I have turned off WIFI in BT router.

Router is failing over to 4G when I remove remove LAN cable successfully, but it's not failing over to 4G if i remove ADSL cable at BT socket.

Firmware Version: 3.8.8.2_BT
DSL Version: 576D17_A/B/C HW: A

WAN2 settings:
Connected as Static or Dynamic IP
Selected option: Obtain an IP address automatically
DNS Server IP Address: My BT DNS IP (also tried 8.8.8.8 )
WAN Connection Detection:
tried ARP detect and Ping Detect
I have set the following setting for Ping Detect
Primary Ping IP: 8.8.8.8
Secondary Ping IP: 8.8.4.4
Ping Gateway IP: My BT router IP (detected automatically)
TTL: 100
Ping Interval: 1sec
Ping Retry: 10 times

WAN3 Settings:
Mode: 3G/4G USB Modem(DHCP mode)
APN Mode: 3internet


Could any one advice me what needs to be changed to get failover.

Found the issue, I shouldn't the checking in gateway checkbox in WAN ping detection.