智能切换问题

I am currently using the gost v3.2.5 version, the current services configuration has configured the listening port, and the chain configuration has two IP addresses, one v4 address and one v6 address. I want to achieve the effect that when either address is not reachable, the traffic will be switched to the other address. If both addresses are reachable, any one of the lower-latency addresses can be selected for access. The current problem is that when v6 is not reachable, the traffic will still be sent to v6. Is it possible to prevent the traffic from going to v6 when v6 fails, and only detect it? When v6 is restored, should it be decided whether to use v6 or v4 based on the latency?