Telecom Broadband Secondary Router IPv6

To enable IPv6 on a secondary router, configure it to receive a delegated prefix from the primary router or use IPv6 pass-through/bridged mode so devices on the secondary LAN can obtain IPv6 addresses.Understanding the SetupWhen you have a primary ISP router providing IPv6 and a secondary router connected via WAN:The primary router typically handles IPv6 address assignment and prefix delegation.The secondary router must either request a delegated prefix via DHCPv6-PD or operate in IPv6 pass-through/bridged mode to allow LAN devices to receive IPv6 addresses directly from the primary router .Steps to Enable IPv6 on a Secondary RouterAccess the Secondary Router Interface Open a web browser and log into the secondary router's management page using its IP address (e.g., 192.168.1.1).Enable IPv6 Navigate to the IPv6 settings section and enable IPv6. Depending on the router, this may be under “Advanced Settings” or “Network Settings” .Configure WAN IPv6Set the WAN interface to DHCPv6 client if the primary router supports prefix delegation.If the primary router does not delegate a prefix, you may need to enable pass-through or bridged mode for IPv6 on the secondary router .LAN IPv6 ConfigurationIf using DHCPv6-PD, the secondary router will receive a prefix (e.g., /60 or /64) and can assign IPv6 addresses to LAN devices.If using pass-through, the secondary router effectively forwards IPv6 traffic, and devices generate their own addresses using SLAAC (Stateless Address Autoconfiguration), .Save and Reboot Apply the settings and reboot both routers to ensure the secondary router correctly receives the delegated prefix or passes through IPv6 traffic.Additional ConsiderationsStateless vs Stateful:Stateless (SLAAC) allows devices to self-assign IPv6 addresses.Stateful (DHCPv6) assigns addresses centrally. Many home networks use stateless or a combination of both .Prefix Delegation Limitations: Some ISP routers may not allow changing the prefix length or may not delegate prefixes at all. In such cases, pass-through mode is the practical solution .OpenWrt or Custom Firmware: If using OpenWrt as a secondary router, ensure the WAN6 interface is configured to request a prefix from the primary router, and the LAN interface is set to advertise the delegated prefix . By following these steps, your secondary router can provide IPv6 connectivity to all connected devices, either by receiving a delegated prefix or by passing through the primary router's IPv6 assignments.