Configuring a MikroTik router to receive an IPv6 address on the WAN interface when your provider already assigns IPv6 addresses involves several steps.

The specific configuration may vary depending on how your ISP is distributing IPv6 (for example, using DHCPv6 or SLAAC).

Below is a general guide on how you could configure your MikroTik router to accept and use an IPv6 address assigned by your ISP:

1. Enable IPv6 Packet

First, make sure IPv6 packet is enabled on your MikroTik router. You can check it in the “System” -> “Packages” menu. If it is not enabled, activate it and restart your router.

2. Configure the DHCPv6 Client (if applicable)

If your ISP uses DHCPv6 to assign IPv6 addresses, you will need to configure a DHCPv6 client on your WAN interface:

/ipv6 dhcp-client
add interface=[tu-interfaz-WAN] pool-name=wan-ipv6-pool request=address

Replaces [tu-interfaz-WAN] with the name of your current WAN interface.

3. Configure Automatic Address Receipt (SLAAC)

If your ISP uses SLAAC (Stateless Address Autoconfiguration) to assign IPv6 addresses, your MikroTik router should automatically receive an IPv6 address on the WAN interface without additional configuration, as long as IPv6 packet is enabled and working correctly. Make sure the WAN interface is configured to accept IPv6 addresses automatically.

4. Firewall Settings

Make sure your firewall is configured to allow IPv6 traffic. This may include configuring rules to allow ICMPv6, which is essential for the correct functioning of IPv6:

/ipv6 firewall filter
add chain=input protocol=icmpv6 action=accept
add chain=input connection-state=established action=accept
add chain=input connection-state=related action=accept

These rules allow ICMPv6 traffic and traffic from established and related connections.

5. Verify Settings

After configuring your router, verify that it has received an IPv6 address from your ISP. You can do it using the command:

/ipv6 address print

This should show you the IPv6 addresses assigned to your router's interfaces.

Final Considerations

• ISP Documentation: Consult the documentation provided by your ISP or contact their technical support for specific details on how they assign IPv6 addresses.
• Safety: Be sure to review and adjust your firewall settings for IPv6, as security needs may differ from IPv4.
• testing: Use tools like ping or visit sites like test-ipv6.com to verify your IPv6 connectivity.

Remember that each ISP may have a slightly different approach to IPv6 assignment, so adapting these general steps to your specific situation may require additional adjustments.