Draytek Vigor 2925 Dial-out configuration
To successfully connect the Draytek & Billion, select IPsec Security Method with High ESP and select DES without Authentication
Billion Router configure as Dial-in
On the Billion select DES as the Encryption Algorithm
1. For some Billion Router models, IPsec is set to Dial-out only. In that case, set the Draytek router to Dial-in mode.
2. The IPsec Security Method may be different on different Billion models and may need adjustment if the VPN cannot connect.