I have two WAN from different providers, I would like to know how can I manage an IP failover to switch services in case of failur of the primary WAN. The only solution that I know is to use dns records and switch them in case of failure.
- Is there any service to switch them automatically?
- If I set a low TTL for my dns records can I be sure a fast switch from clients all over the world? Do DNS cache servers consider my TTL settings?