Hi @PAUL532 

Thanks for posting in our business forum.

If you want a faster switch, change the detection interval to 1 minute.

5-minute detection interval means at least 5 minutes would be waited before it switches back to the primary as the primary is up again.

Custom interval should be available with the later controller versions. I assume your controller is not up-to-date?

Hi @PAUL532 

Thanks for posting in our business forum.

PAUL532 wrote

  @Clive_A 

 

Maybe you mis read the question.

 

Its switching to backup, when the primary is not offline. the WAN is bouncing between WAN and backup for no reason.

 

That title is kind of misleading. I thought it switched to the backup and not gonna switch back even though the WAN is up.

How do you verify this symptom you described?

With what tool or command?

Have you tried to Wireshark and capture the "leak" flowing through the backup WAN?

Hi @PAUL532 

Thanks for posting in our business forum.

PAUL532 wrote

   @Clive_A 

I verify by using DuckDNS and WHatsMyIP
running a check once a min in Home Assistant.
I can see the IP address oscillating between WAN and backup

You can see here switching between pink and blue, Pink is a 4G address rom Three UK
Blue is the WAN IP from QuickLine 5G 1Gbs ISP

When both WAN and Backup are both UP, its bouncing between them.

I would expect, if WAN is DOWN for 5 mins, to switch to backup, while monitor WAN, if WAN is back, switch back

Port Mirroring and Wireshark and let me know if this fits what you observe on the mentioned services.