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Re: OT: Networking Dropping Out

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On 19/05/2017 19:51, rickman wrote:
> On 5/19/2017 7:38 AM, Martin Brown wrote:
>> On 19/05/2017 12:06, Martin Riddle wrote:
>>> On Fri, 19 May 2017 00:02:35 -0400, rickman <gnuarm@gmail.com> wrote:
>>>
>>>> I've been having a problem with my networking periodically.  But it
>>>> only
>>>> happens in one location.  When I am at other places I don't see it
>>>> happen.
>>>>
>>>> Because the Internet provider here is not so perfect, I keep a command
>>>> window open with a 1 second ping running on 8.8.8.8 which is a major
>>>> server that should never go down.  The symptom I see is this ping
>>>> starts
>>>> timing out or at least the times go way up from 20-40 ms range to quad
>>>> digits.  This is concurrent with all the web apps losing access to the
>>>> Internet, browser, email, newsreader...
>>
>> Assuming you ping that directly without DNS lookup then it seems most
>> likely that you are running into a tapit cause by the doubling backoff
>> rule when ethernet packets find themselves corrupted by contention.
>
> Yes, IP address ping without DNS lookup.  "tapit cause"?  Not sure what
> that means.  Google doesn't know.

Typo for tarpit. Basically the exponential backoff really hurts if a 
burst of interference prevents the resend working many times.

> Contention would be hard to justify, 1 attached device.  I suppose
> corruption would do the same thing.

That is why you need to try a wired connection. It will be the first 
thing your ISP recommends when you report a fault.

>>>> I originally thought it was the ISP since I don't see the problem
>>>> when I
>>>> am at other locations.  But I opened browser tabs to the router and
>>>> modem only to find I have no access to them either while this is
>>>> happening.  So it must be something in my PC or possibly the router.
>>>> When the connection is restored the router is in the same context it
>>>> was
>>>> before the disruption, so the router isn't rebooting.  The wifi
>>>> connection is 5 of 5 bars.
>>
>> Try it with a wired connection to see if it goes away.
>
> Not so easy to do.  I need a 40 foot cable.

40' is nothing. You can do a trailing cat5 cable for a test.
It isn't rocket science.

>> If the PC to router config webpage is inaccessible the chances are the
>> problem is very local indeed. Bad cable or neighbouring RF interference.
>
> Not much here to interfere.  One house some 100 feet away with no one in
> it.  Everything else is multiple 100's of feet away.  I see their wifi
> SSIDs once in while, mostly I appear to be alone here.
>

Something is wrecking data transmission. The obvious diagnostic is to 
use another more reliable connection to the router.

-- 
Regards,
Martin Brown

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OT: Networking Dropping Out rickman <gnuarm@gmail.com> - 2017-05-19 00:02 -0400
  Re: OT: Networking Dropping Out Martin Riddle <martin_ridd@verizon.net> - 2017-05-19 07:06 -0400
    Re: OT: Networking Dropping Out Martin Brown <'''newspam'''@nezumi.demon.co.uk> - 2017-05-19 12:38 +0100
      Re: OT: Networking Dropping Out makolber@yahoo.com - 2017-05-19 06:57 -0700
      Re: OT: Networking Dropping Out rickman <gnuarm@gmail.com> - 2017-05-19 14:51 -0400
        Re: OT: Networking Dropping Out Jon Elson <jmelson@wustl.edu> - 2017-05-19 15:02 -0500
          Re: OT: Networking Dropping Out rickman <gnuarm@gmail.com> - 2017-05-19 16:53 -0400
            Re: OT: Networking Dropping Out Przemek Klosowski <przemek@tux.dot.org> - 2017-05-19 23:30 +0000
              Re: OT: Networking Dropping Out rickman <gnuarm@gmail.com> - 2017-05-19 22:05 -0400
            Re: OT: Networking Dropping Out Jon Elson <elson@pico-systems.com> - 2017-05-19 21:26 -0500
              Re: OT: Networking Dropping Out rickman <gnuarm@gmail.com> - 2017-05-19 23:00 -0400
        Re: OT: Networking Dropping Out jrwalliker@gmail.com - 2017-05-19 14:59 -0700
        Re: OT: Networking Dropping Out Martin Brown <'''newspam'''@nezumi.demon.co.uk> - 2017-05-20 08:41 +0100
          Re: OT: Networking Dropping Out rickman <gnuarm@gmail.com> - 2017-05-20 04:11 -0400
    Re: OT: Networking Dropping Out Jon Elson <jmelson@wustl.edu> - 2017-05-19 14:55 -0500
  Re: OT: Networking Dropping Out Jasen Betts <jasen@xnet.co.nz> - 2017-05-25 04:54 +0000
    Re: OT: Networking Dropping Out rickman <gnuarm@gmail.com> - 2017-05-25 15:21 -0400
      Re: OT: Networking Dropping Out Jasen Betts <jasen@xnet.co.nz> - 2017-05-26 05:50 +0000
        Re: OT: Networking Dropping Out rickman <gnuarm@gmail.com> - 2017-05-26 03:46 -0400

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