# GL-MT6000 (Flint 2) Multiwan failover mode (not detecting failing interface) **URL:** \ **Category:** Router\ **Created:** [June 25, 2025, 8:16am UTC](https://forum.gl-inet.com/t/gl-mt6000-flint-2-multiwan-failover-mode-not-detecting-failing-interface/60270 "2025-06-25T08:16:11Z")\ **Posts on this page:** 16\ **Page:** 1
**Author:** ![Rivo](https://forum-assets.gl-inet.com/letter_avatar_proxy/v4/letter/r/59ef9b/32.png) [@Rivo](https://forum.gl-inet.com/u/Rivo)\ **Post date:** [June 25, 2025, 8:16am UTC](https://forum.gl-inet.com/t/gl-mt6000-flint-2-multiwan-failover-mode-not-detecting-failing-interface/60270/1 "2025-06-25T08:16:11Z")
Apart from the [subnet conflict](https://forum.gl-inet.com/t/gl-mt6000-flint-2-multiwan-failover-mode-guest-subnet-conflict) issue, I still can't have an Internet connection from the failover 4G router when the cable from the failing ISP is plugged on WAN. Yet, if I unplug the cable, I can get an Internet connection. Any idea on how to make the router detect the failing Internet connection on the interface without physically unplugging the wire? ---
**Author:** ![alen5193](https://forum-assets.gl-inet.com/letter_avatar_proxy/v4/letter/a/6a8cbe/32.png) [@alen5193](https://forum.gl-inet.com/u/alen5193)\ **Post date:** [June 25, 2025, 10:40am UTC](https://forum.gl-inet.com/t/gl-mt6000-flint-2-multiwan-failover-mode-not-detecting-failing-interface/60270/3 "2025-06-25T10:40:12Z")
When the ISP's cable fails, it takes a certain amount of time to detect, and only after the failure is confirmed will the WAN network source be switched. You can try to set the sensitivity to reduce the detection time. ![image](https://forum-static.gl-inet.com/original/3X/5/6/56c70cf254fd6f2c40c96b73a140d2f99087497a.png) ![image](https://forum-static.gl-inet.com/original/3X/0/5/05fcd8d0e9e67f4a3b693db6ab80dc1747500891.png) ---
**Author:** ![Rivo](https://forum-assets.gl-inet.com/letter_avatar_proxy/v4/letter/r/59ef9b/32.png) [@Rivo](https://forum.gl-inet.com/u/Rivo)\ **Post date:** [June 25, 2025, 11:04am UTC](https://forum.gl-inet.com/t/gl-mt6000-flint-2-multiwan-failover-mode-not-detecting-failing-interface/60270/4 "2025-06-25T11:04:15Z")
The weird thing is, I lose any connection as soon as I plug the ISP's cable. I tried Low and High (Medium being the default) but to no avail. No failover to the 4G router's connection ☹ ---
**Author:** ![azleatherneck](https://forum-assets.gl-inet.com/user_avatar/forum.gl-inet.com/azleatherneck/32/15761_2.png) [@azleatherneck](https://forum.gl-inet.com/u/azleatherneck)\ **Post date:** [June 25, 2025, 2:58pm UTC](https://forum.gl-inet.com/t/gl-mt6000-flint-2-multiwan-failover-mode-not-detecting-failing-interface/60270/5 "2025-06-25T14:58:06Z")
Have you moved the priority of the connection to suit your setup? Towards the bottom of the multi-wan settings page you can move them up or down based on desired behavior ---
**Author:** ![Rivo](https://forum-assets.gl-inet.com/letter_avatar_proxy/v4/letter/r/59ef9b/32.png) [@Rivo](https://forum.gl-inet.com/u/Rivo)\ **Post date:** [June 25, 2025, 3:16pm UTC](https://forum.gl-inet.com/t/gl-mt6000-flint-2-multiwan-failover-mode-not-detecting-failing-interface/60270/6 "2025-06-25T15:16:36Z")
Here is my current setup ![Multi-wan setup](https://forum-static.gl-inet.com/original/3X/5/d/5d2029c930a1ab9b39be8c6238aca3244580456f.jpeg) My desired behavior is Ethernet 1 (the currently failing ISP is plugged in here) has priority over Ethernet 2 (where the 4G router is connected) but only if Ethernet 1 is live. The problem is, the failover didn't work as expected: there is no Internet through Ethernet 1 and yet the router didn't get it from Ethernet 2. If I unplug the ISP cable from Ethernet 1, I have a working connection from Ethernet 2 😅 ---
**Author:** ![azleatherneck](https://forum-assets.gl-inet.com/user_avatar/forum.gl-inet.com/azleatherneck/32/15761_2.png) [@azleatherneck](https://forum.gl-inet.com/u/azleatherneck)\ **Post date:** [June 25, 2025, 3:21pm UTC](https://forum.gl-inet.com/t/gl-mt6000-flint-2-multiwan-failover-mode-not-detecting-failing-interface/60270/7 "2025-06-25T15:21:29Z")
What’s the WAN IP you get? Sounds like you may have some IP conflicts going on. Most cell providers use CGNAT and assign you a private IP. Check your logs look for errors during the time is should switch over ---
**Author:** ![Rivo](https://forum-assets.gl-inet.com/letter_avatar_proxy/v4/letter/r/59ef9b/32.png) [@Rivo](https://forum.gl-inet.com/u/Rivo)\ **Post date:** [June 25, 2025, 3:29pm UTC](https://forum.gl-inet.com/t/gl-mt6000-flint-2-multiwan-failover-mode-not-detecting-failing-interface/60270/8 "2025-06-25T15:29:59Z")
Which WAN IP? 1. ISP modem assigns (dhcp) 192.168.0.10 to Ethernet 1 2. 4G router assigns (dhcp) 192.168.17.101 to Ethernet 2 If I unplug 1, I have Internet connection through Ethernet 2. If I plug it back, I have no connection at all while I expected to still have a working Internet connection, still through Ethernet 2 as a failover. ---
**Author:** ![azleatherneck](https://forum-assets.gl-inet.com/user_avatar/forum.gl-inet.com/azleatherneck/32/15761_2.png) [@azleatherneck](https://forum.gl-inet.com/u/azleatherneck)\ **Post date:** [June 25, 2025, 8:50pm UTC](https://forum.gl-inet.com/t/gl-mt6000-flint-2-multiwan-failover-mode-not-detecting-failing-interface/60270/9 "2025-06-25T20:50:10Z")
Go read up on networking. If your subnet is /16 that’s the same network. Again it sounds like an IP conflict ---
**Author:** ![Rivo](https://forum-assets.gl-inet.com/letter_avatar_proxy/v4/letter/r/59ef9b/32.png) [@Rivo](https://forum.gl-inet.com/u/Rivo)\ **Post date:** [June 25, 2025, 9:54pm UTC](https://forum.gl-inet.com/t/gl-mt6000-flint-2-multiwan-failover-mode-not-detecting-failing-interface/60270/10 "2025-06-25T21:54:37Z")
I don't see why the two interfaces would be on the same subnet. The netmask from both (ISP modem and 4G router) dhcp servers is 255.255.255.0. And where would be an IP conflict if the two interfaces are assigned different addresses and different gateways to the Internet at large? Really, this use case seems to be the closest to a by the book use case for the multiwan failover mode and still the manual is finally not so clear on how to make it work. ---
**Author:** ![azleatherneck](https://forum-assets.gl-inet.com/user_avatar/forum.gl-inet.com/azleatherneck/32/15761_2.png) [@azleatherneck](https://forum.gl-inet.com/u/azleatherneck)\ **Post date:** [June 27, 2025, 2:15am UTC](https://forum.gl-inet.com/t/gl-mt6000-flint-2-multiwan-failover-mode-not-detecting-failing-interface/60270/11 "2025-06-27T02:15:59Z")
What do your logs say when it should be in failover? ---
**Author:** ![alen5193](https://forum-assets.gl-inet.com/letter_avatar_proxy/v4/letter/a/6a8cbe/32.png) [@alen5193](https://forum.gl-inet.com/u/alen5193)\ **Post date:** [June 27, 2025, 6:55am UTC](https://forum.gl-inet.com/t/gl-mt6000-flint-2-multiwan-failover-mode-not-detecting-failing-interface/60270/12 "2025-06-27T06:55:46Z")
We hope you can try to reproduce the problem again after the router is started and export the log to us. ---
**Author:** ![alen5193](https://forum-assets.gl-inet.com/letter_avatar_proxy/v4/letter/a/6a8cbe/32.png) [@alen5193](https://forum.gl-inet.com/u/alen5193)\ **Post date:** [June 30, 2025, 11:00am UTC](https://forum.gl-inet.com/t/gl-mt6000-flint-2-multiwan-failover-mode-not-detecting-failing-interface/60270/13 "2025-06-30T11:00:47Z")
Hi there, The txt log file you sent is incomplete and does not contain much information. It is recommended that you use SSH to execute the following command to increase the log level, then reproduce the failover problem again, and then export the entire log file package. `echo 3 > /proc/gl-kmwan/debug` > **[SSH log in to the Router - GL.iNet Router Docs 4](https://docs.gl-inet.com/router/en/4/tutorials/ssh_log_in_to_the_router/)** > > Documentation for GL.iNet Router Productions Please export the log here, do not just copy a section. ![image](https://forum-static.gl-inet.com/original/3X/e/4/e46f014c7d81a72f0d288f3c1d7a93560070e403.png) ---
**Author:** ![Rivo](https://forum-assets.gl-inet.com/letter_avatar_proxy/v4/letter/r/59ef9b/32.png) [@Rivo](https://forum.gl-inet.com/u/Rivo)\ **Post date:** [July 6, 2025, 4:14pm UTC](https://forum.gl-inet.com/t/gl-mt6000-flint-2-multiwan-failover-mode-not-detecting-failing-interface/60270/14 "2025-07-06T16:14:54Z")
I just sent two log files. Could you please reopen the [other thread](https://forum.gl-inet.com/t/gl-mt6000-flint-2-multiwan-failover-mode-priority-not-respected/60476) as it was on a different issue (set priority not respected)? ---
**Author:** ![alen5193](https://forum-assets.gl-inet.com/letter_avatar_proxy/v4/letter/a/6a8cbe/32.png) [@alen5193](https://forum.gl-inet.com/u/alen5193)\ **Post date:** [July 7, 2025, 11:08am UTC](https://forum.gl-inet.com/t/gl-mt6000-flint-2-multiwan-failover-mode-not-detecting-failing-interface/60270/15 "2025-07-07T11:08:28Z")
We have received your log file. We will analyze it. In addition, your other post has been reopened. ---
**Author:** ![Rivo](https://forum-assets.gl-inet.com/letter_avatar_proxy/v4/letter/r/59ef9b/32.png) [@Rivo](https://forum.gl-inet.com/u/Rivo)\ **Post date:** [July 22, 2025, 8:49am UTC](https://forum.gl-inet.com/t/gl-mt6000-flint-2-multiwan-failover-mode-not-detecting-failing-interface/60270/16 "2025-07-22T08:49:06Z")
My ISP got the service back yesterday. So I plugged it back on Ethernet 1 and everything worked fine. A traceroute from a host client shows that Internet is accessed from Ethernet 1 as expected (it's the first interface in the Interface priority panel). When I unplugged Ethernet 1, failover works and Internet is accessed from Ethernet 2, as expected. Unfortunately, when I simulated a network outage (unplugged the fiber cable from the ISP modem) with the modem ethernet cable still plugged to Ethernet 1, failover again didn't work. So I'm eager to see the bug fix in the next firmware 😉 ---
**Author:** ![system](https://forum-static.gl-inet.com/original/3X/7/7/77e28f6cb342ac4bd641bd9a6254595d61b2812a.png) [@system](https://forum.gl-inet.com/u/system)\ **Post date:** [February 4, 2026, 10:31am UTC](https://forum.gl-inet.com/t/gl-mt6000-flint-2-multiwan-failover-mode-not-detecting-failing-interface/60270/18 "2026-02-04T10:31:48Z")
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