It has been known for many years that IPv4 addresses with the format 32 bits (the ones we have used all our lives, to understand each other) are going to end. The solution proposed and accepted at the time was to go for IPv6, a renewed standard that allows a much higher number of Internet addresses, specifically the comparison is 4.294.967.296 (IPv4) versus 340.282.366.920.938.463.463.374.607.431.768.211.456. 6 (IPvXNUMX).
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Apple has confirmed that OS X El Capitan will be the first Cupertino operating system in prioritize use of the new addresses as follows: when an OS X packet is received, it will give a time of 25 milliseconds to work with IPv6 directly, and if that timer fails then compatibility mode is activated and that packet is worked on in IPv4.
According to the tests they have done in Apple, it is expected that in 99% of the cases OS X El Capitan (as well as iOS 9) work with IPv6, while 1% of the remaining times will continue to use the IPv4 system. And although it is something totally transparent for the user and does not have much impact on the end use, it is quite interesting that Apple wants to be in the pole position of IPv6.
By the way, these new features are implemented in the latest public betas, so if you have encouraged to install In advance versions, you will already be using this protocol, and that is helping Apple to improve its efficiency for the final launch that will take place between October and November if everything continues as expected.
This worries me because it will affect the little online gaming on mac, adding 25 ms to the connections does not seem like a good idea, especially if it is by default.