Draytek Vigor2100 - Manual (Page 36)

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C. For PPTP Users
1. Check that whether the Enable option is selected.
2. Check that whether PPTP Server, Username, Password is
entered the correct value given by your ISP.
3. Check that whether LAN2/WAN IP Network Settings is set
appropriately or not. You need to enter “Specify an IP address”,
IP Address and Subnet Mask with the correct value.
If the router settings are correct at all, and the router still does not
connect, please contact your ISP technical support representative
to help you for configuration.
Step 5. Back to Factory Default Setting
Warming: After pressing the "factory default setting", you will loose all
settings you did before. Make sure you have recorded all useful settings.
The password of factory default is null.
A Software Reset
You can also reset router to factory default via Web configurator.
B Hardware Reset
While the router is running (ACT LED blinking), press the button
and hold for more than 5 seconds. The ACT LED begins to blink