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Need advice on VPN failover

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Hello,

I have a setup like this:

my_asg --> IPSec VPN --> external office, wan 1

however it sometimes happens, that wan 1 at the external location goes down for unknown reasons (carrier is mostly the problem).
When that happens I'd like to switch the VPN over to a different connection so it goes from my_asg (same interface) to the wan 2 of the external office, because they have two independend wan links.
Now I expected the "Uplink monitoring" feature to do this but when I put a host, that's reachable through the VPN in there, it consideres my whole internet traffic (I have 2 wan links as well) to be down although that host ist reachable (ping from asg works fine). So I switched that back to "automatic monitoring". However I only need to switch the VPN when I can't reach the remote location anymore, not when one of my wan links goes down.

Any ideas how to solve this?

Cheers,
Chris

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