I have the 600Mbps Service, but only getting 100Mbps at the Modem.
I had an Arris SB6190 with Asus AC1900. I only managed to get 100Mbps over ethernet (modem/router) and 2.4 wifi. On 5G, I mangage to get 450Mbps.
Then upgraded to SB8200 and Asus AC2900. nothing changed and same speeds remained. I called comcast, rebooted the modems/routers & no change. I also used different ethernet cables, no change. Any thoughts?
What do you get directly connected to the 6190 modern (no router in the equation) ?