[CentOS] Spotty internet connection

> -----Original Message-----
> From: CentOS [mailto:centos-bounces at centos.org] On Behalf Of Joseph L.
> Casale
> Sent: Thursday, February 2, 2017 8:58 PM
> To: 'CentOS mailing list'
> Subject: Re: [CentOS] Spotty internet connection
> 
> > -----Original Message-----
> > From: CentOS [mailto:centos-bounces at centos.org] On Behalf Of TE Dukes
> > Sent: Thursday, February 2, 2017 6:13 PM
> > To: 'CentOS mailing list' <centos at centos.org>
> > Subject: [CentOS] Spotty internet connection
> >
> > How do you IT guys diagnose the problem with a spotty internet
> connection?
> >
> > Just spent an hour on the phone with TWC/Spectrum. Of course they
> > don't see anything wrong with their service.
> >
> > They send me to speedtest.net. The first attempt, the page didn't
> > fully load, the second attempt, the page didn't load at all, the third
> > attempt, it loaded.
> >
> > On a 20/2MB line I get 24.83/2.47MB. The speed is better than what I'm
> > paying for but its spotty.
> >
> > Lately I have been getting slow  and partial page loads, server not
> > found, server timed out, etc.. Get knocked off ssh when accessing my
> > home server from work, etc. Its not the work connection because I
> > don't have problems accessing other sites, just here at home and my home
> server.
> >
> > Is there any kind of utility to check for failing hardware?
> 
> All depends where and what the fault is.
> 
> You can use wireshark to check for duplicate acknowledgements and
> retransmissions, that's low hanging fruit.
> 
> Two recent issues I found that manifested in miserable browsing speed
> where poor dns resolution speed (many tools exist to determine your
> optimal forwarders or if you using the root hints it might expose this is
a less
> than optimal configuration) made for long pauses and a bad cable for a
user.
> The cable worked, and on the lan the retries made it seem like there
wasn't
> problem. Over the wan, the retries made everything painfully slow.

Thanks,

My first thought it might be a dns issue. I may change to googles dns
servers and see if things improve.

This just started in the last couple days. I know TWC and Charter are
merging, but this is irritating.

I'll check out wireshark.