I have a scenario where there are users on two sites with thier own internet connectivity. Recently one of the ISPs had a significant outage, and therefore the users lost access.
Is there anyway to detect such an outage, and re-route traffic through a WAN link to make use of the alternative internet connection on another site?
The two internet connections are via different service providers, and have PA addressess, I am not and can not run BGP. There are no incomming services with these links, they are purely used for user access to the internet.
I have attached a simplified diagram, which may assist the explanation.