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Re: OT: Networking Dropping Out

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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.
>>
>> 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.
>>
>> This condition can last a few seconds to a few minutes.  Sometimes this
>> seems to be triggered by clicking a link in a browser, but it often
>> happens randomly.
>>
>> I'm pretty much at a loss to figure out what is causing this.  Any
>> suggestions?  Is there something in the PC that could cause this?

Ethernet packet timeout and exponential backoffs resulting from them.

>> I guess I do have one idea, buy a new router and see if that is the
>> problem.  This router is 15 years old, so a new one wouldn't be a total
>> waste.  I'm really surprised to see some of the fancy dancy routers
>> costing $200 and up.  I got this one for free, but I guess I'll have to
>> buy one for $50 ballpark.
>
> Might be a DNS problem.  Have you ran DNSBENCH to characterize the DNS
> servers ?

Seems unlikely. It is also suspicious that the router's and modem's own 
home pages cannot be reached. I'd suspect the router. Cheap fast ones 
can be had for about £10 these days. But if it is as old as you say then 
its Wifi is probably pretty dreadful and insecure so you might well be 
better off with a newer more capable all in one.

> Also try setting a DNS address in windows, so that the router does not
> have to do the lookups.

If the PC to router config webpage is inaccessible the chances are the 
problem is very local indeed. Bad cable or neighbouring RF interference.



-- 
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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