Most excellent. It seems I was trying to over complicate things. Thanks very much for your clear explanation, it seems to be working perfectly.

Thanks again

I have a routerboard 1000 running version 5.12. I have quite a bit of experience with mikrotik but this is the first time I’ve tried to use the stateful connection tracking feature. I am trying to setup failover with two internet connections (labeled WAN-DSL and WAN-SC) but with a couple of caveats....