How exactly are you testing your connection?  That's a relevant bit regarding networking.  If testing in phoenix, test a LA California-based server, as most cox residential egresses there.  I like Race Communications out of LA to test against on speedtest.net.  Anything else hits interstate transit, more than cox already does dumping you out LA peering points.

Your host nic can handle line rate, and so can the kernel in most cases, really the question is your transport and the applications using it.

If using a speedtest.net sort of test, then ymmv with the server you're testing against..  If dealing with comcast, I don't know their peering infrastructure as much as cox's, but they're not typically local, and probably transport you to another state for egress.  This isn't much different from cox, they dump you out LA or Dallas, usually the former than latter, only cbs and other direct peering relations egress actually in phoenix.  Post a traceroute to 8.8.8.8 if you want some recommendations to test against for real world usage.

Look at your modem levels too.  You can hit your moto/arris modem on http://192.168.100.1 url to see your modem levels, this has existed since 2000 or so with the advent of docsis and motorola not sucking.  SNR, RX/TX power are what you want to look at, and plenty of wikipedias about docsis to explain tolerances.  If not within tolerance, call the provider to start digging and replace coax as necessary.

Every few years my cable gets crappy, and I have to call them to help me dig up and replace bits of either the yard or house to replace.  Arizona is hell on coax with suck-out and other syndromes of extreme heat-based dysfunction.  Expect your levels to go to hell every 3-4 years in arizona with coax.

HTH!

-mb

On Wed, Sep 5, 2018 at 1:12 PM, Jim <jim.nantz15@comcast.net> wrote:

Back in June comcast raised my connection speed to 150Mbps.  Two weeks ago it went back down to 100.  I called to complain and was told I was supposed to be  getting 100Mbps.  I finally got someone to admit that my connection speed should be 150, but I'm still getting 100. 

I didn't make any changes to the network, but something could have gotten changed.  Is there anything i can look in network settings to determine if something could be tweaked for a faster connection?

I have an Arris SB6141 modem and an ASUS RT-ACRH13 gigabit router.  The modem (SB6141) supports speeds up to 343Mbps down.  KDE's network manager shows the MTU setting is set to Automatic and the box is checked to allow auto negotiation.

I did install Kubuntu 18 after the increase to 150Mbps.  The speed did not drop until a month or so after Kubuntu 18 was installed.

Since the installation, the ethernet connection is no longer called eth0.  Now it's called enp4s1.  Is that some new way of naming network devices?  I don't really care what it calls the parts as long as they work.  I can still use netwatch, but I have to give it the enp4s1 string as it expects eth0 unless  told differently.

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