does having the xr500 connected to to the ont box give issues

thanks furrye38 for the options but i just put it back into the router from verizon an put it into dmz because i have tv with them an you need to have the coax hooked up to the modem in order to have your tv boxes to work an on demand otherwise all of your advice would have worked if i just had internet from them but i thank you for all the options.