It is a system which feeds IPv4 data using the IPv6 network.
You can connect not only to IPv6 websites but also to IPv4 websites with IPv6 network.

Asahi Net provides IPv4 over IPv6 connection in the following two methods.
・DS-Lite
・IPIP

How to connect with the respective method are as follows.

■DS-Lite
Please connect with IPv4 over IPv6 which is an additional feature to the IPv6 Connection Feature.
This feature is provided for free if you are subscribed to a supported connection service.
See the following page for more details.
IPv6 Connection Feature (IPv4 over IPv6 Connection)

■IPIP
Please connect with IPv4 over IPv6 (IPIP) for Fixed IP Address Option.
You can use the feature by adding a paid option to a fiber-optic service which you are subscribed to.
See the following page for more details.
Fixed IP Address Option