Correctly configuring a DHCPv6 client on a MikroTik device to obtain Internet connectivity with an IPv6 public IP may involve several steps and settings.

We give you a basic guide on how to configure it and some tips on what to do if you can't get out to the Internet after you have configured the DHCPv6 client.

Basic DHCPv6 Client Configuration in MikroTik

1. Access your MikroTik device using WinBox, WebFig, or SSH.
2. Go to the interface where you will receive the IPv6: Typically, this is the interface connected directly to your ISP.
   • In WinBox or WebFig: Navigate to Interfaces, select the relevant interface, and verify that it is enabled.
   • In CLI: You can list your interfaces with /interface print.
3. Configure the DHCPv6 Client:
   • In WinBox or WebFig: Go to IPv6 → DHCP Client, click the plus sign (+) to add a new DHCPv6 client. Select the corresponding interface, and adjust the settings as necessary. Be sure to check “Request” for the address and/or prefix if your ISP provides these.
   • In CLI: Use the command /ipv6 dhcp-client add interface=[tuInterfaz] request=address,prefix add-default-route=yes.
4. Review and Adjust IPv6 Routes: Make sure you have a default route that uses the gateway provided by DHCPv6.
   • /ipv6 route print It will show you the current routes. You should see a default route that points to the gateway assigned by your ISP.
5. Configure IPv6 Firewall to allow IPv6 traffic. This includes allowing ICMPv6 and the traffic necessary to browse the Internet.
   • Make sure your firewall is not blocking necessary inbound or outbound IPv6 traffic.

Problem solving

If after configuring the DHCPv6 client on your MikroTik device you are unable to obtain Internet connectivity, here are some areas to check:

• Check IP Assignment: Make sure your MikroTik is correctly receiving an IPv6 address and prefix from your ISP. You can check this in the DHCP IPv6 Client section.
• IPv6 DNS: Make sure you have DNS servers configured that can resolve names over IPv6. Without DNS working, you will not be able to browse the Internet properly.
• Firewall: Check your firewall rules to make sure they are not blocking IPv6 traffic. It is essential to enable ICMPv6, which is crucial for IPv6 functionality, including neighbor discovery and stateless auto-configuration.
• Check Connectivity: Use tools like ping to verify connectivity to external IPv6 addresses. This can help you determine if the problem is with the route, DNS, or your firewall configuration.

If after following these steps and tips you are still facing problems, it would be helpful to review any specific documentation from your ISP regarding their IPv6 support and configuration, as some providers may have specific requirements or configurations that need to be implemented.