[olug] Network performance analysis

[Kevin]

Could be a web filtering firewall/software on the client machine as well.
Test to identify which it is is to see if a request goes out from the
machine immediately or if it gets caught up in the machine first.

On Thu, Nov 20, 2014 at 3:28 PM, Noel Leistad <noel at metc.net> wrote:

> To me, lagging after click sounds like DNS issues (amongst other
> things...), quick and easy on the DNS is:
>
> https://www.grc.com/dns/benchmark.htm
>
> It should at least help find out if is a resolver issue.
>
> Noel
>
>
>
> On 11/20/2014 02:35 PM, Bill Brush wrote:
> > Rob I'm painfully (agonizingly) aware of how many variables I'm
> > dealing with here.
> >
> > To go into a little more detail, the raw speed seems fine for the most
> > part.  We're seeing some traffic spikes on the internet link up to the
> > limit, but it's rarely sustained.  A speed test at speedtest.net
> > usually comes back at around 90% of our nominal speed for our link.
> >
> > The main "symptom" seems to be a lag in things starting to move.  So
> > if you click a link it sits there and thinks about it, then moves.
> > Sometimes this is a few seconds, sometimes it's over a minute.
> >
> > I'm going to set up a 30 day trial of Solarwinds bandwidth analysis
> > pack and hopefully it will show me something.  My forays with
> > Wireshark have not turned up anything obvious.
> >
> >
> > On Thu, Nov 20, 2014 at 2:22 PM, Rob Townley <rob.townley at gmail.com>
> wrote:
> >> Bill,
> >>
> >> i feel your pain.
> >>
> >> Keep in mind "slowness" can be caused at many layers of the network.
> >>
> >> -physical tests to verify Cat6 compliance from (PC) patch cable to wall
> >> plate thru cable run back to patch panel thru another patch cable (
> network
> >> switch).  This could be an electrician with a ~$2500.00? Cat6 tester.
> $per
> >> wall plate
> >>
> >> -firmware on NIC / motherboard
> >>
> >> -device driver version
> >>
> >> -10Mbps half-duplex vs 1000Mbps FullDuplex
> >>
> >> -switch
> >>
> >> -vPro / IPMI
> >>
> >> -IPv6 vs IPv4 issues
> >>
> >> -DNS slowness or timing out
> >>
> >> -router
> >>
> >> -wireless channel (1 ,6, 11)
> >> On Nov 20, 2014 12:20 PM, "Bill Brush" <bbrush at gmail.com> wrote:
> >>
> >>> Hello all.
> >>>
> >>> I don't post much, but I've been lurking around here for many years.
> >>>
> >>> I'm looking for help investigating complaints that our network is
> >>> "slow".  I have a rudimentary knowledge of doing packet captures, and
> >>> the basics, but an in-depth investigation is beyond my current skills.
> >>>
> >>> I inherited this network a couple years ago, and I will freely admit
> >>> that prior to this I had never had to worry about my infrastructure so
> >>> I have not checked for pre-existing issues.
> >>>
> >>> So is anyone in the Omaha area an expert at network analysis?  If it's
> >>> your day job we can discuss your hourly rates.
> >>>
> >>> Thanks!
> >>> Bill
> >>> _______________________________________________
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> >>> OLUG at olug.org
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> >>>
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> >
>
>
> --
> #######################################################
> #  Noel Leistad, CISSP                                #
> #  Internet System Administrator                      #
> #  Marne & Elk Horn Telephone Co                      #
> #  4242 Main Street                                   #
> #  Elk Horn IA 51531                                  #
> #                                                     #
> #  noel at metc.net                                      #
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>
> Leave no stone unturned.
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