HELP!!!! I have fibra connection with thomson router(TG784 -my ISP) and I need to connect to my other router(2820vn). and I receive on 2820vn the internal IP from TG784.  if I connect my computer on 2820vn don´t have internet access. 
TG784----»»»
RJ45
»»»
2820vn. 
I need to know the best configuration to work with this two router