iRule for Global redirect and failiover

The solution is Topology. As Mohamed says, Local DNS is the client. So the client IP address is the local DNS IP address.

Topology will allow you to specify :

• All Europe users to Europe DC --> till DC goes down
• All US users to US DC --> till DC goes down

You just need to set a topology policy and assign it to your load balancing method.

Be careful, Topology can be apply on WideIP and Pool. Assign it the right context.