Asus RT-AC86U DUAL-WAN not working, WAN connected but unreachable

[johnr01]

The DUAL WAN on the RT-AC86U with the latest Firmware Version 3.0.0.4.382 a well as on the Merlin firmware is completely unstable when adding a "ping to internet" for instance www.google.com.
De WAN is working and shows UP (static IP to my cable router) but there is no internet traffic possible for all devices behind the RT-AC86U.
WAN settings are Failover+Fallback.

When not enabling the ping to internet it seams to be fine with the port status, but it won't track if my WAN link is really down as I have 2 other routers behind the Asus facing the WAN

For me this makes this router total useless with dual wan
On my old RT-AC68 it was working with Asus ans Merlin.

Anybody have some suggestions of having the same problems wit this router?

log:
Feb 14 01:01:24 modprobe: module btusbdrv not found in modules.dep
Feb 14 01:02:15 rc_service: wanduck 708:notify_rc restart_wan_if 0
Feb 14 01:02:17 miniupnpd[875]: shutting down MiniUPnPd
Feb 14 01:02:17 wan: finish adding multi routes
Feb 14 01:02:24 vpnserver1[1300]: Initialization Sequence Completed
Feb 14 01:02:25 rc_service: wanduck 708:notify_rc restart_wan_if 1
Feb 14 01:02:28 wan: finish adding multi routes
Feb 14 01:02:30 miniupnpd[1390]: version 1.9 started
Feb 14 01:02:30 miniupnpd[1390]: HTTP listening on port 34977
Feb 14 01:02:30 miniupnpd[1390]: Listening for NAT-PMP/PCP traffic on port 5351
Feb 14 01:02:35 WAN(1) Connection: Ethernet link down.
Feb 14 01:02:44 miniupnpd[1390]: HTTP Connection from 192.168.1.38 closed unexpectedly
Feb 14 01:03:03 rc_service: wanduck 708:notify_rc restart_wan_line 0
Feb 14 01:03:03 rc_service: waitting "restart_wan_if 1" via wanduck ...
Feb 14 01:03:18 rc_service: skip the event: restart_wan_line 0.
Feb 14 01:03:18 wan: finish adding multi routes
Feb 14 01:03:20 rc_service: httpd 762:notify_rc reboot
Feb 14 01:03:20 rc_service: waitting "restart_wan_if 1" via wanduck ...
Feb 14 01:03:35 rc_service: skip the event: reboot.
Feb 14 01:03:37 WAN(0) Connection: WAN was restored.
Feb 14 01:03:37 start_nat_rules: apply the nat_rules(/tmp/nat_rules_eth4_eth4)!
Feb 14 01:03:37 ntp: start NTP update
Nov 14 22:22:48 rc_service: ntp 867:notify_rc restart_upnp
Nov 14 22:22:48 rc_service: waitting "restart_wan_if 1" via wanduck ...
Nov 14 22:23:11 crond[761]: time disparity of 394340 minutes detected
Nov 14 22:23:12 rc_service: skip the event: restart_upnp.
Nov 14 22:23:12 rc_service: ntp 867:notify_rc restart_diskmon
Nov 14 22:23:12 rc_service: waitting "restart_wan_if 1" via wandu

When trying to reboot this is blocked due to above. Only can take out power cable to get WAN back to forwarding packets.

 

[SensAnarchy]

My rt-ac86u does not work at all with dual WAN. The first connection works but the second never works. says DHCP error with isp (second wan set to automatic ip into ISP Modem/Router) says Connected but doesn't work when set with Static IP (Cant access ISP Modem/Router even though says connected) and if i put ISP Modem/Router into bridge mode and attempt to use PPOE it doesn't connect.

Tried latest firmware and merlin firmware with no luck

Now i have an older RT-N12 and Dual wan works flawlessly. Think im going to give up on ASUS Routers and go somewhere else