Simple situation description:
* I have two WAN failover settings based on policy routing (strictly set which address group will use which WAN as primary and second WAN as failover only)
* I have a sort of public IPs provided from each WAN provider, most of them are distributed to our clients via NETMAP, so in situation of primary WAN outage, they still have working internet, BUT via different public IP
* BUT I have also sort of clients where they have public IP routed directly on their router's wan port (via our DHCP)... so if the primary WAN provider (who provide that public IPs) have a problem am I able to somehow keep that public IPs (provided from primary WAN provider) reachable via second failover WAN? Is this a task for routing protocols like BGP, OSFP...?
Sorry for such basic question and thanks for reply.