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Re: And Now for Something Completely Different (was Re: IPv6 news)
Mike Leber wrote:
Real world shows that that doesnt work very well. Multiple A records is not usuable practicaly speaking for anything other than load balancing, today.
DNS is a good example of something that was designed that way, but few people rely on common implementations actualy performing it properly.If the location layer session times out then it would try the other locators listed (pick a method of selection) and if it suceeded would resume the session transparent to the identifier layer. Design the timeout and retransmit algorithm and parameters to achieve the convergence times of your choice.
You would need a new protocol stack on the hosts at both ends of connections. By common convention classic TCP hosts could be told to use one of the locators (a transition hack, or just run the protocols in parallel). No change would be required to the network, and existing TCP could continue to be supported (no flag day).
Appears to me thats what shim6 is (cursory reading + nanog discussions)
Long story short, seperating endpoint/locator does nothing to allow multiple paths to a single IP6 address/prefix to scale.Of course support of this new protocol would be limited to the clients and servers that chose to implement it, however this is no less than the change required for IPv6 which some hoped would solve the multihoming problem (possibly defined as scalably supporting network topology change without sessions being interrupted).