ZyXEL Communications PMG5317-T20A - Before You Begin

Chapter 6 Broadband
PMG5317-T20A User’s Guide
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Figure 20 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 GPON 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 GPON 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 GPON Device uses it’s configured IPv6 WAN IP to route IPv6 traffic
to the IPv6 Internet.
Figure 21 Dual Stack Lite
6.1.3 Before You Begin
You need to know your Internet access settings such as encapsulation and WAN IP address. Get this
information from your ISP.
ISP (IPv4)
IPv6 Internet
IPv4
IPv6
BR
IPv6 in IPv4
IPv4 Internet
IPv4
+
LAN
- IPv6
- IPv4
WAN
- IPv4
- IPv6 in IPv4
ISP (IPv6)
IPv6 Internet
IPv6
AFTR
IPv4 in IPv6
IPv4 Internet
IPv6
IPv4
+
LAN
- IPv6
- IPv4
WAN
- IPv6
- IPv4 in IPv6