ZyXEL Communications SBG3300-N series User Manual page 44

Chapter 5 Broadband
compose the network address. The prefix length is written as "/x" where x is a number. For
example,
2001:db8:1a2b:15::1a2f:0/32
means that the first 32 bits (2001:db8) is the subnet prefix.
IPv6 Subnet Masking
Both an IPv6 address and IPv6 subnet mask compose of 128-bit binary digits, which are divided
into eight 16-bit blocks and written in hexadecimal notation. Hexadecimal uses four bits for each
character (1 ~ 10, A ~ F). Each block's 16 bits are then represented by four hexadecimal
characters. For example, FFFF:FFFF:FFFF:FFFF:FC00:0000:0000:0000.
IPv6 Rapid Deployment
Use IPv6 Rapid Deployment (6rd) when the local network uses IPv6 and the ISP has an IPv4
network. When the Device has an IPv4 WAN address and you set IPv6/IPv4 Mode to IPv4 Only,
you can enable 6rd to encapsulate IPv6 packets in IPv4 packets to cross the ISP's IPv4 network.
The 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 Device uses it's configured IPv4 WAN IP to route IPv4
traffic to the IPv4 Internet.
Figure 19 IPv6 Rapid Deployment
LAN
- IPv6
- IPv4
+
IPv6 IPv4
Dual Stack Lite
Use Dual Stack Lite when local network computers use IPv4 and the ISP has an IPv6 network.
When the Device has an IPv6 WAN address and you set IPv6/IPv4 Mode to IPv6 Only, you can
enable Dual Stack Lite to use IPv4 computers and services.
The 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 VDSL Router uses it's configured IPv6 WAN IP to route IPv6 traffic to the
IPv6 Internet.
44
WAN
- IPv4
- IPv6 in IPv4
ISP (IPv4)
IPv6 in IPv4
IPv4
IPv4 Internet
BR
IPv6 Internet
SBG3300-N Series User's Guide