We have a uniform high availability configuration [somewhat like 1] with the difference we have two different subnets, vlan and vsphere for two different sites, X and Y. The host in site X has ip 10.192.168.5 and similar host in site Y has ip 10.150.6.16). The hosts are connected to an active-active storage where the luns are seen in the two different sites. A client will hit a url which will have a public IP then this will be mapped to the ip on site X 10.192.168.5. However, when Site X fails it does not redirect traffic to Site Y since we cannot get the same ip in Site Y which is in a different subnet. We trying to minimize routing i.e. when site X goes down then go to firewall and add rules to redirect traffic to Site Y.
- What is the best way to have HA on two different sites with different subnets where the client does not experience any downtime i.e. seamless from the client point of view?
- Whats the minimum changes that we can make to accommodate the above design?