"Late Wednesday evening, Google employees posted an
"Internet-Draft" outlining proposed changes to the DNS protocol
that allow authoritative DNS servers to see the addresses of
clients. This way, geographically distributed content delivery
networks can tailor their answers to a specific client's network
location. So a client from California would talk to a server in
California, while a client in the Netherlands would talk to a
server in the Netherlands.
"Currently, authoritative DNS servers don't see the client
address, only the address of the resolving server that is typically
operated by the client's ISP. So in the current situation, if our
Californian and Dutch clients both use a DNS resolver in New York,
a location-optimizing authoritative DNS server would give them both
the addresses of servers in or around New York. By including the
client's address in the request, the authoritative server can send
a better response and improve the subsequent interactions between
the client and server because the request/response round-trip times
across the network are shorter."
