This appears to be an extension to DNS that would allow for what many network vendors call global load balancing. In the current implementation, your upstream

This appears to be an extension to DNS that would allow for what many network vendors call global load balancing. In the current implementation, your upstream provider (like Comcast) doesn't pass on the IP of the client doing the DNS query to the authoritative server. Not knowing the correct client IP prevents the server from figuring out which server would be, for example, closest for a given client. The proposed changes to DNS would allow an upstream provider's DNS server to pass on 3 of the 4 octets of an IP address to the authoritative server. This would allow the server to make judgments on which IPs it returned to the client based on the client's own IP address. I wonder what net neutrality concerns this raises?