Does ELB Support IPv6 Networks?

Shared load balancers support only IPv4 networks. Dedicated load balancer load balancers support both IPv4 and IPv6 networks.

At Layer 4, when a client communicates with a dedicated load balancer using an IPv6 address, the load balancer must communicate with backend servers using an IPv6 address. At Layer 7, when a client communicates with a dedicated load balancer using an IPv6 address, the load balancer must communicate with backend servers using an IPv4 address.

• If you do not enable IPv6 for the specified backend subnet when you create a dedicated load balancer, the load balancer cannot use IPv6 addresses to route requests.
• If you need IPv6 networks, you must select a backend subnet with IPv6 enabled for your dedicated load balancer.

Figure 1 Network types supported by dedicated load balancers at Layer 4

Figure 2 Network types supported by dedicated load balancers at Layer 7