On Mon, Jun 13, 2022 at 12:34 AM home user <mattis...@comcast.net> wrote:
> On 6/12/22 4:25 AM, George N. White III wrote: > > On Sun, Jun 12, 2022 at 12:21 AM Tim via users > > <users@lists.fedoraproject.org <mailto:users@lists.fedoraproject.org>> > > wrote: > > > > On Sat, 2022-06-11 at 19:50 -0600, home user wrote: > > > Multiple times over 4-5 hours I > > > - powered down and powered up the modem; > > > - reset the modem; > > > - disconnected and reconnected the yellow ethernet cable; and > > > - rebooted the work station, trying both OSs. > > > So I switched back and forth multiple times. There also were > other > > > URLs > > > that worked in windows-7 but not Fedora-35, but I think 3 URLs > were > > > enough of a sample for this thread. > > > > Sounds like your ISP had problems. Do they have a status page? If > so, > > have a look, see if it lists past outages, bookmark it for next time > > (also find its IP, now, so you can check if DNS doesn't work in the > > future). > > > > > > Randomly rebooting without gathering data is time consuming and not very > > informative. > > It was not random. The rebooting was done to: > * compare windows-7 and Fedora-35 in hopes of determining whether the > problem was in Fedora-35, the modem, or "out there". > * see if something done to the modem helped. > I did what I knew to do, though I recognize that my knowledge on these > things is poor. > You will find it well worth the effort to learn some basics of network troubleshooting: A beginner's guide to network troubleshooting in Linux | Enable Sysadmin (redhat.com) <https://www.redhat.com/sysadmin/beginners-guide-network-troubleshooting-linux> > > > Many ISP's provide a support site that offers a speed test and in some > > cases even include information about current status of their service. A > > speed > > test can tell you if the problems you see are local or in your ISP's > > access to > > the wider internet. There are also sites like downdector that collect > > problem > > reports and provide graphs of the numbers of reports over time. Those > > peaks > > often coincide with times when I encountered problems, so can help to > > confirm > > that a problem wasn't something on my end. > > The only speed test I've ever seen seemed very "snoopy" and intrusive > the last time I accessed it. That was some time ago, I don't recall > when. I do recall Firefox and/or NoScript not liking the site. I've > never seen any hint of a speed test being offered by my ISP > (comcast/xfinity), though I log into that company's site at least once > per month. Status site for comcast: see my reply to Tim. What if I > can't access comcast's/xfinity's site? > If you can't connect to your ISP's site you should call their support line and be prepared to wait in a queue with all the others having problems (I connect my phone to the charge and put in speaker mode so i can do other stuff while I wait). "Speed tests" are a popular way bad actors get victims to sites that try to extract money. Using your ISP's test should be as safe as anything from your ISP. ShieldsUP! https://www.grc.com/ is a reputable site that you can use to scan your system for internet accessible ports. > I could not access downdetector Saturday morning. > That is what I see when I'm having problems, but once service is restored I can usually see the spike in reports around the time I had a problem, which means I don't pester admins at the remote site I couldn't reach. > > > During periods of high demand (Superbowl, public hearings by US Congress) > > the internet may fall back to less optimal routing. Your zoom issues > > could be > > due to "rate limiting" by your ISP, generally imposed during periods > where > > customer aggregate demand exceeds capacity. > > My zoom issues occur after the zoom meeting is done and I've left > (disconnected from) the zoom site in Firefox, not during the meeting. I > have not tried any diagnosis. > Compare "ss -tl" results before, during, and after a zoom session. > > > You appear to be using a wired connection, but if you have wifi you > should > > check that only "known to you" devices are connecting. Your router > should > > list connected devices by their MAC address, so you may want to collect > the > > MAC addresses of "known to you" devices and turn off MAC address > > randomizaton > > for portable devices when connected to your home wifi. > > I'm using a wired connection only. > No wifi. > No router. > Are you running internet facing services (web page, ssh, etc.)? To list active tcp connections and listening ports, use "ss -tl". "ShieldsUp!!": https://www.grc.com/ is a reputable site that will tell you which ports are open to the internet. -- George N. White III
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