On 2009-09-23 21:05, Olivier MJ Crepin-Leblond wrote:
...
Is a dual stack IPv4-IPv6 likely to be more unstable than pure IPv4 or
pure IPv6?
Apart from the software engineering principle that more of almost
anything is less reliable, there is a specific problem that if your
computer believes it has IPv6 connectivity, but actually doesn't,
*and* if your DNS service returns AAAA records, then you will see
long delays in connecting to dual-stack servers while the application
tries IPv6, times out, and finally tries IPv4.
But of course some sort of flag waving exercise such as deprecating
RFC 791 would have no effect on this in the real world. Running out
of IPv4 addresses, and discovering that both nested NAT and port-based
address sharing are horrible, will do it for us.
Brian
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