networking question

[Michael Butash]

Levels seem decent, so doesn't seem to be an issue with the transport.

Have you tried bypassing your router and dhcp direct to the internet?  I've
heard older consumer routers are having a hard time keeping up with now
typical 100mbps speeds, maybe it's just getting long in the tooth there too.

Otherwise, it *is* comcast, the most consumer unfriendly isp out there, and
loves to use packet shapers to throttle users down.  Perhaps they don't
like your using all your bandwidth and feel you need less, as they tend to
do this with netflix, youtube, and other bandwidth intensive applications
already.

It could just be peering congestion too, I've seen it with cox here
periodically.  I can usually tell running an mtr to something like
google.com, and watching for packet-loss and increased latency at the
different peering hops.  I tend to call a buddy that works there to harass
him why their service sucks, and tend to hear back on some bandwidth
augmentation processes going as a result, though ymmv with standard support
as they'll have no idea, so just escalate otherwise if you see something
like.

-mb

On Wed, Sep 5, 2018 at 10:55 PM, Jim <jim.nantz15 at comcast.net> wrote:

>
>
> On 09/05/2018 09:34 PM, Michael Butash wrote:
>
> 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.
>
> I live about 30 miles north of Knoxville, a place called Jacksboro.The
> server I've been testing is one Comcast has in Nashville,
> speedtest.xfinity.com.  If I go to speedtest.net, I usually get a comcast
> server in Nashville.  I've used netwatch to find whether or not they're the
> same server (they're not), but I get similar results.  Back in June when I
> was getting 150 Mbps, I did speed tests with both servers and got results
> at least 50 Mbps faster than I get now.
>
>
> 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.
>
> The SNR for all 8 downstream channels is 39dB.  The power level for each
> is -3dBmV.
> Tx power for all 3 upstream channels is 48 dBmV.  i've looked it up and
> anything i've seen says these levels are ok.
>
>
> 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.
>
> I know.  I used to work with a guy who installed sprinkler systems.  One
> day we were putting in system.  He was using the trench digging machine.
> It was throwing up rocks and dirt when it suddenly started throwing up bits
> of RG6.
>
>
> HTH!
>
> It does. Thanks.
>
> The cable here is strung up on poles.  The cable tv rarely goes out, and
> the internet is reliable if not as fast as it should be.  The power goes
> out at least once every two weeks no matter the weather.  It's out for an
> hour or so at a time.  The power company blames it on the squirrels.
> Apparently they like the taste of power lines better than the flavor of tv
> cable.
>
> The dinosaur I'm writing this on used to be a Dell Inspiron 550.  I don't
> use the built in ethernet adapter because it's 100 Mbit.  One day I may get
> ambitious and try bonding the two interfaces together.  My next step will
> be to ask a friend to bring his laptop over, plug it into my router and see
> what speed it gets.
>
>
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