40Mbps Bonded DSL Speed Problems

The MTU you change on the pc and can set it back very simple if you follow the link I sent bet yours is set to 1500 you can mess about 5 points at a time until you find the best

I am stuck using a CenturyLink DSL connection also. A few years ago it was limited from 5 -10Mbps. Later I went to 10 Mbps. It was reliable but they were offering a 20M Bonded. THey had to install new field wires because the esxisting ones would not support much over 10 Mb. The 20 has been fairly reliable but I did find that if I enabled the wireless radio feature in the CL supplied Modem my speeds would be cut in half again. As I use my own home network wireless system I keep the CL wireless turned off. Speeds are around 18-22M consistently. Nothing to brag about but does work. I also found out if I installed another modem into the CL modem ethernet my speed would be cut. No fiber out here.

Early today, I realized that I had never tried using my phone to check the speed, so I logged on to the modem's 5G setting. Suddenly, the speed jumped up to perhaps 38Mbps. (I say "perhaps" because so many events took place until a short while before posting this that they all run together.)

Given the good speed, I quickly logged on and ran tests on the computer; they were good for a while, then the speeds fell off. Made my first call to Centurylink, nothing much accomplished. After a while, a second call, which ended when the agent did a factory reset of the modem, as he saw it was having problems. Ethernet, router, phone, all verified good speeds.

That lasted perhaps fifteen minutes; third call, replacement should be here next Tuesday.

As I have suspected (not known, of course, just suspected) problem does not appear to be in my system; a new modem should determine if it is. With my thanks to all who have offered advice on finding something that may well not even exist, I am going to leave this thread open so that I can report further findings, but given that it is likely that the modem is the cause, I won't add to the thread for now nor reply to any messages that are here as I write this. If the replacement modem fixes the situation, I will so report and mark this as solved.

Three more calls to Centurylink tech support 20Dec2019:

1. I don't recall much about this call, other than that the tech did try to assist me.

2. I don't recall what engendered this call, but I certainly do recall that this was the first time that the agent, after doing the usual looking at the network, etc. , took a serious look at my modem. He made some changes; I don't know what they were, but he said they did not help. His last step, after telling me that he saw some problems with the modem, was to do a reset. This resulted in the restoration of the speeds I should have been getting. I asked him if he thought that this would last; he said that he did.

3. Some fifteen minutes after ending call (2.), speeds dropped precipitously, so I made a third call. I tried to be as calm and polite as I could, given the circumstances for something that had started 09Dec2019, when a tech tried to install the new modem, and could not due to a disconnected Centurylink cable.

The woman I was talking with rather quickly realized that I should be provided with a replacement modem; she even waived the shipping fee. The replacement arrived around 1500 hours local on Tuesday 24 December. It took me about fifteen minutes to set it up, connect to Centurylink to finish the installation.

This screen shot shows an example of what the replacement modem is finally providing:



My only concern now is, I hope unfounded: The replacement modem is one that had been refurbished, rather than a new one, but then, considering that the first modem was a new one, perhaps a refurbished one is better.

With that, I shall conclude this thread, leaving you with quia nunc vale .