As you might be aware that, the present internet connections run over IPv4 protocol. IPv4 has run out of space there by forcing the global internet network to upgrade to IPv6. Hence JUNE 8th is marked as IPv6 day. As the part of the transition, global internet giants, hardware industries all are expected to upgrade their systems to IPv6
Internet is running out of the space in IPv4.The new IPv6 is expected to provide four billions times the space that was provided by IPv4.
So, why the internet MAY collapse?
Google in its blog, has explained the impact of this transition on the global internet domain.
Google says "In all likelihood, you won’t even notice the test. The vast majority (99.95%) of people will be able to access services without interruption: either they’ll connect over IPv6, or their systems will successfully fall back to IPv4. However, as with any next-generation technology, there may be teething pains. We estimate that .05% of systems may fail to fall back to IPv4, so some people may find Google, Facebook, Yahoo, Bing and other participating websites slow or unresponsive on World IPv6 Day. This is often due to misconfigured or misbehaving home networking equipment, such as home routers, that can make a computer think it has IPv6 connectivity when in fact it’s not working."
You can also test you IPv6 capability
Run Google IPv6 Test