On the WAN side delete the '::' and enter xxxx:xxxx:feed:6069::/56, then you should have a fixed IP. You will also need to enter a static IPv4 address on the WAN section for the unit to accept your Ipv6 configuration.
We have tested IPv6 with Enta (ISP) we then check our connection with
http://test-ipv6.com/ and we get 10/10 for both Ipv6 and ipv4 results.
Here is more information on IPv6
IPv6 Autoconfig
The IPv6 address composes of two parts, thus, the prefix and the interface ID.
There are two ways to dynamically configure IPv6 address on hosts. One is statefull configuration, for example using DHCPv6 (which resembles its counterpart DHCP in IPv4.) In the stateful autoconfiguration model, hosts obtain interface addresses and/or configuration information and parameters from a DHCPv6 server. The Server maintains a database that keeps track of which addresses have been assigned to which hosts.
The second way is stateless configuration. Stateless auto-configuration requires no manual configuration of hosts, minimal (if any) configuration of routers, and no additional servers. The stateless mechanism allows a host to generate its own addresses using a combination of locally available information (MAC address) and information (prefix) advertised by routers. Routers advertise prefixes that identify the subnet(s) associated with a link, while hosts generate an "interface identifier" that uniquely identifies an interface on a subnet. An address is formed by combining the two. When using stateless configuration, you needn’t configure anything on the client.
Static LAN IPv6 Address Configuration
Interface Address / Prefix Length: enter the static LAN IPv6 address, we suggest leave the field empty because when setted wrong, it will result in LAN devices not being able to access other IPv6 device through internet. Router will take the same WAN’s prefix to LAN side if the field is empty.
IPv6 LAN application
DHCPv6 Server: check whether to enable DHCPv6 server.
DHCPv6 Server Type: select Stateless or Stateful. When DHCPv6 is enabled, this parameter is available. Stateless: if selected, the PCs in LAN are configured through RA mode, thus, the PCs in LAN are configured through RA mode, to obtain the prefix message and generate an address using a combination of locally available information (MAC address) and information (prefix) advertised by routers, but they can obtain such information like DNS from DHCPv6 Server. Stateful: if selected, the PCs in LAN will be configured like in IPv4 mode, thus obtain addresses and DNS information from DHCPv6 server.
Start interface ID: enter the start interface ID. The IPv6 address composed of two parts, thus, the prefix and the interface ID. Interface is like the Host ID compared to IPv4.
End interface ID: enter the end interface ID.
Note: Interface ID does NOT support ZERO COMPRESSION "::". Please enter the complete information.
For example: Please enter "0:0:0:2" instead of "::2".
Leased Time (hour): the leased time, similar to leased time in DHCPv4, is a time limit assigned to clients, when expires, the assigned ID will be recycled and reassigned.
Issue Router Advertisement: check whether to enable issue Router Advertisement feature. It is to send Router Advertisement messages periodically. Router will multicast the v6 Prefix information (similar to v4 network number 192.168.1.0) to all LAN devices if the field is enabled. We suggest enabling this field.
