ZyXEL GS-105I User Guide - Page 76
IPv6 Rapid Deployment, Dual Stack Lite
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Chapter 6 Broadband IPv6 Rapid Deployment Use IPv6 Rapid Deployment (6rd) when the local network uses IPv6 and the ISP has an IPv4 network. When the Zyxel Device has an IPv4 WAN address and you set IPv4/IPv6 Mode to IPv4 Only, you can enable 6rd to encapsulate IPv6 packets in IPv4 packets to cross the ISP's IPv4 network. The Zyxel Device generates a global IPv6 prefix from its IPv4 WAN address and tunnels IPv6 traffic to the ISP's Border Relay router (BR in the figure) to connect to the native IPv6 Internet. The local network can also use IPv4 services. The Zyxel Device uses it's configured IPv4 WAN IP to route IPv4 traffic to the IPv4 Internet. Figure 42 IPv6 Rapid Deployment Dual Stack Lite Use Dual Stack Lite when local network computers use IPv4 and the ISP has an IPv6 network. When the Zyxel Device has an IPv6 WAN address and you set IPv4/IPv6 Mode to IPv6 Only, you can enable Dual Stack Lite to use IPv4 computers and services. The Zyxel Device tunnels IPv4 packets inside IPv6 encapsulation packets to the ISP's Address Family Transition Router (AFTR in the graphic) to connect to the IPv4 Internet. The local network can also use IPv6 services. The Zyxel Device uses it's configured IPv6 WAN IP to route IPv6 traffic to the IPv6 Internet. PX7511-B0 User's Guide 76