Netgear D6400 – AC1600 WiFi VDSL/ADSL Modem Router—802.11ac Dual Band Gigabit User Manual

The modem router automatically detects the information in the Router’s IPv6 Address 
on LAN field. This field shows the IPv6 address that is acquired for the modem router’s 
LAN interface. The number after the slash (/) is the length of the prefix, which is also 
indicated by the underline (_) under the IPv6 address. If no address is acquired, the field 
displays Not Available.

In the 6rd Configuration section, configure the 6rd settings:

6rd Prefix. Enter the IPv6 prefix that your ISP gave you.

6rd Prefix Length. Enter the IPv6 prefix length that your ISP gave you.

6rd Border Relay Address. Enter the border router’s IPv4 address that your ISP 
gave you.

6rd Address Mask Length. Enter the IPv4 mask length that your ISP gave you.

Select an IPv6 Domain Name Server (DNS) Address radio button:

Get Automatically from ISP. The ISP’s DHCP server automatically assigns IPv6 
DNS server addresses.

Use These DNS Servers. Enter the static IPv6 (not IPv4) DNS server addresses that 
your ISP provided to you.

Select an IP Address Assignment radio button:

Use DHCP Server. The modem router assigns IPv6 addresses to the devices on your 
home network (the LAN) through a DHCP server. This method passes more information 
to LAN devices, but some IPv6 systems might not support the DHCPv6 client 
function. This is the default setting.

Auto Config. The modem router automatically configures its IPv6 address based on the 

IPv6 protocol.