EC2 clouds exist in several different geographic locations. You may want to direct client traffic to a specific EC2 region based on geographic location (e.g. European traffic routed to an EC2-EU instance while Eastern US traffic is sent to EC2-US East).
Unfortunately, there is no way to geographically control the flow of traffic at the load-balancer level. However, you could control traffic in this way at the domain level. You would need to create two sets of DNS A records: one set for your load-balancer servers in EC2-US East for your Eastern US customers, and one set of A records for your load-balancer servers in EC2-EU for your European customers.
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