6rd-Border-Relay

A router can operate as a 6rd client or as a 6rd border relay. A 6rd client or 6rd CE router (customer edge router) connects to an Internet service provider via a WAN connection and propagates the 6rd prefix to clients on the LAN. A 6rd border relay operates in the provider's network and connects 6rd clients to the IPv6 network. Thus a 6rd border relay used when an IPv6 connection is to be provided to 6rd routers.