Achieving High-Availability DNS
Implementing Anycast with MikroTik OSPF and AdGuard Home In high-availability infrastructure, DNS is a non-negotiable critical service. Conventional "Primary and Secondary" DNS configurations often suffer from client-side timeout issues. By leveraging Anycast via OSPF , we ensure that DNS failover is handled instantly by the router, providing a truly redundant and load-balanced experience. I. The Evolution: Before vs After Traditional Setup (Unicast) Clients have two separate IPs. If Server 1 dies, the client "hangs" waiting for a timeout before trying Server 2. This causes perceptible delays. [ CLIENT ] (DNS: .3 & .4) | (Waiting for .3...) v +----------------+ | ROUTER | +-------+--------+ | +----+----+ | | v v [ ADGUARD 1 ] [ ADGUARD 2 ] (.88.3) (.8...