Post by dyno danA little over a week ago I received an email from Comcast giving me
"good news." They said my Ethernet service had been upgraded, I would
now have 25% faster speed, at no extra cost. All I have to do is reset
my modem.
So I reset my modem (by pulling the power plug) four times in the last
week. My ethernet monitor shows the same exact top download speed as
before.
Perhaps they are counting on customers just THINKING their speed is
faster?
Speed is regulated by how many channels are bonded together. The more
channels, the faster the bandwidth. How many channels you get is
dictated first by the maximum number your cable modem supports, and then
by Comcast provisioning your modem (them programming it) to specify how
many channels to bond. If you are using an old modem with less channels
to assign, you cannot increase the speed of the modem. You'll need a
modem with more channels. You didn't mention the brand and model of the
cable modem you are using. Over the course of many years with Comcast,
we've had to twice go to their store to exchange for a newer cable
modem, because the old one didn't have enough channels.
https://us.hitrontech.com/learn/cable-modems-explained-channel-bonding/
You sure the message came from Comcast? Look at the Received headers to
trace backward (downward) through them to check if the source of the
message was from Comcast (although they have, in the past, contracted
with outsiders to issue their service messages).
I'm not sure pulling the plug will reset your modem, especially if it
has a backup battery. Press the Reset button at the back, but only for
about 10 seconds, or less (usually just a press and release is enough).
The modem will get reprovisioned during its initialization.
Whose speed test are you using to check your network speed that you
contract from Comcast? Comcast's speed test (speedtest.xfinity.com), or
speedtest.net (from Oooma)? Comcast only supports the service tier you
have with your network, so first use their speed test site. They don't
guarantee anything outside their network, like at Speedtest.
Did you run a speed test /before/ resetting the modem, so you know what
it was before the reset to compare with what you get now?
For me, speedtest.net always shows a higher downstream bandwidth than
measured at Xfinity's speed test site. For upstream, both measure about
the same bandwidth. Also, upstream is far slower than downstream
because Comcast provides me a service tier with asynchronous bandwidths.
You didn't mention which direction you were measuring.
So, what did Comcast's technical support say when you contacted them
about the lack of bandwidth improvement as announced? Maybe you need a
new cable modem (more channels). Maybe you aren't properly resetting
the cable modem to force a reprovisioning. Only cite speed testing
using their speed test site, not some site outside their network for
which they have no control and cannot guarantee speed to that site or
its responsiveness. Forget whatever app or device you are measuring
local bandwidth within your intranetwork. Comcast has no control over
your local network setup, only to their network.