Can IPv6 access directly from the net?Let's try it and make sure

Unlike IPv4, NAT is not used in IPv6

　In conventional IPv4 networks, the so -called "NAT" has divided the global and private worlds.Although there are differences depending on the environment, it is an image as shown on the right.

　To connect directly to the Internet, you need a global IP address used on the Internet, but this address is limited.For this reason, only one is assigned to one of the WAN ports of the router, and a private IP address is used for the network at home.

　NAT is a mechanism to convert this private IP address and global IP address.Strictly speaking, not only the address but also the port is converted, so it should be called "napt" or "IP mascalade", but here it is a large NAT.

　NAT is a technology for responding to the depletion of IPv4, but this mechanism has secured some security.Specifically, while converting communication from inside to external and reply to it, the outside and internal networks were separated by not usually converting access from outside to internal.

　For this reason, it was necessary to set up port forwards to allow access to the NAS or to permit communication for matches in games (some models also needed IPv4 filter settings).

　On the other hand, in the Internet connection environment using IPv6, as shown in →, all addresses are basically treated as "global".

　In fact, if you look at the address of the terminal connected to the network at home, you can see that it is a global address.In IPv6, the use of the address is determined depending on the range, but if it starts with "2", it can be considered a global address.