Cause: A mismatch in MSCHAPv2 credentials or the IPsec Pre-Shared Key.
Essential but complex. Setting up an L2TP/IPsec server on MikroTik (RouterOS) is a rite of passage for network administrators. While the protocol is robust and supported natively by almost all operating systems (Windows, macOS, iOS, Android), the setup on MikroTik is notoriously "clicky." It requires synchronizing three different modules (PPP, IPsec, and Firewall) to work correctly.
/ip authentication add name=l2tp_auth protocol=pap set l2tp_auth password=l2tp_password set l2tp_auth username=l2tp_username mikrotik l2tp server setup full
On the input chain (traffic to the router itself):
Before starting the configuration, ensure your MikroTik router meets the following requirements: Cause: A mismatch in MSCHAPv2 credentials or the
While L2TP/IPsec is a reliable workhorse, it is worth noting that modern protocols like and IKEv2 offer better performance, lighter code, and more modern cryptography. If your client devices and RouterOS version support them, they are excellent alternatives to consider for a future-proof deployment. If you have any specific issues, the MikroTik community forums are an excellent resource for additional help.
Next, Alex moved to the menu to build the blueprint for these connections. Under the Profiles tab, he created a new profile named L2TP-Profile . He set the Local Address to the router’s own bridge IP and pointed the Remote Address to his newly created vpn-pool . To keep things secure, he ensured Change TCP MSS was enabled to prevent packet fragmentation issues. While the protocol is robust and supported natively
The profile defines the "rules" for the connection, such as encryption and the gateway address. Go to > Profiles . Click + to create a new profile. Name : l2tp-profile