Good afternoon!
I have a router ASUS RT-AC68U. A couple months ago I flashed it by firmware of Merlin, and all was OK. (used only 1 WAN).
12.01.2015 needed to set up Dual WAN. Before this I flashed my router by Merlin's firmware 376.49_5
Primary WAN (WAN port): static IP
Secondary WAN (Ethernet LAN port 1): PPTP
1. After set up and reboot, Primary WAN is Connected, and Secondary WAN is Disconnected.
2. As the experiment I set up Primary WAN is Ethernet LAN port 1,
Secondary WAN is WAN port. After reboot Primary WAN is Disconnected, and Secondary WAN is Connected. In this way I thought that my PPTP
Internet service provider have problems, because static IP Internet service provider works on any WAN.
3. Next I tried to change connections physically (Static to LAN port 1, PPTP to WAN port), but PPTP didn't worked.
4. Next I tried to disable Dual WAN and set up only PPTP connection. AND IT WORKED STABLE!
5. I thought that may be firmware with bugs and tried to rollback asus original firmware FW_RT_AC68U_30043783873.trx with Administration firmware upgrade in WEB, but after reboot the firmware was 376.49_5 by Merlin.
Next I tried to reset router to factory defaults and repeated firmware upgrade - not result.
Next I turned off router, pressed RESET button 10 more seconds and tried to upload the firmware from PC with "ASUSTek - CFE miniWeb Server". Before that I clicked "restore default NVRAM values". After downloading and rebooting the firmware again was 376.49_5 by Merlin. But I still tried to set up Dual WAN, and IT'S WORKS!!! Stable!!! I was very hapy, and tested this 1 hour. After that I reboot router and the problem is back. PPTP didn't worked!
6. In the end of my "epic fail" I tried to reset firmware by Asus Firmware Restoration Utility - the result is "Error automatic firmware update".
Please tell me what am I doing wrong...
May be some problems with NVRAM?
Sorry for my English