FRITZ!Box 4040 Service - Knowledge Base
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What is DS Lite and how does it work?
Dual-Stack Lite (DS-Lite) is a technology that allows applications that use the conventional Internet Protocol v4 (IPv4) to access the internet via Internet Protocol v6 (IPv6). DS-Lite is used by internet providers that do not have sufficient public IPv4 addresses for their customers and therefore set up IPv6 internet connections with DS-Lite for them.
When used on DS-Lite internet connections, the FRITZ!Box encapsulates all data from IPv4 applications into IPv6 packets and then transmits them to the internet provider via the IPv6 connection (IPv6-in-IPv4 tunnels). There, a special server unpacks the IPv6 packets and forwards the IPv4 data they contain to the actual destination on the internet.
With DS-Lite, almost all IPv4 applications can be used without restriction. It is only not possible to access the FRITZ!Box or devices in the home network over the internet via IPv4 because the FRITZ!Box does not obtain a public IPv4 address from the internet service provider. This means that if you are operating servers in the home network, they cannot be accessed from the internet via IPv4.
The Port Control Protocol (PCP) can be used to resolve this type of connection problem. With PCP, the FRITZ!Box can set up port sharings for itself at the internet service provider's, making it unnecessary to have a public IPv4 address. The FRITZ!Box already supports PCP and the first providers of DS-Lite internet connections could start to support PCP in the course of 2018.
Note:If the FRITZ!Box is being used on a DS-Lite internet connection, you can access it and the home network from the internet via IPv6. For this type of IPv6 connection, both parties must have an IPv6 internet connection. This is not the case in most mobile communication networks and wireless hotspots.