I am having my finals, so I am without time to post here and do testing.
One thing you could try later on, unbridge the ISP Modem, Switch back to DHCP on the 835, input the WAN IP address the 835 gets from the ISP Modem and put that into the DMZ on the ISP modem, then see if you get automatic measurements.
The measurement worked, but the modem is very unstable working as a router with DMZ, so I can't use this config forever.
I will change to cable soon, so this won't be a problem anymore.