An organisation would use multiple leased lines (Internet Service Providers (ISP’s)) for redundancy. The primary leased line will be always active and the secondary will take over when the primary fails. When secondary leased line is active, and if a load balancer (Hardware) does not exist, then the outbound mails through the secondary ISP will be blocked by DNS-based Block lists (DNSBLs) mechanism, considering it as a spam, though they are genuine.
Challenge: To mitigate, devise a virtualized (software based) load balancer as an alternative to the hardware load balancers that are available in the market.
Sample data required: No