How to Setup L2TP VPN on Huawei Router - VPNanswers.com
How to Configure Ivacy on Huawei Router (PPTP) - Ivacy
Example for Configuring a PC to Dial Up to a Router Through L2TP - AR100-S, AR110-S, AR120-S, AR150-S, AR160-S, AR200-S, AR1200-S, AR2200-S, and AR3200-S Web-based Typical Configuration Examples - Huawei
L2TP VPN on Mikrotik, Android and Windows | Murray's Blog