The ISP has an internal IPv4 network. Each customer has a CE router (Customer Equipment), sometimes called the RG (Residential Gateway) with an IPv4 address on the WAN side. On the LAN, we can have IPv4 and IPv6 hosts. When an IPv6 host transmits a packet, the CE router encapsulates the IPv6 packet in an IPv4 packet and depending on the destination, it is transferred to another CE router or the BR (Border Relay) router of the ISP.
The border relay router has an IPv4 address on the ISP network side and provides connectivity between the CE routers and the IPv6 Internet. When it receives an IPv6 packet that is encapsulated in an IPv4 packet from one of the CEs, it de-encapsulates the packet and forwards it to the IPv6 internet.
https://networklessons.com/cisco/ccie-routing-switching-written/ipv6-6rd-rapid-deployment
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