[App_rpt-users] Reliability / Network Stability

[Loren Tedford]

Tom can you explain a bit more on iperf? How to install and run from
command line and possibly from windows?

Loren Tedford (KC9ZHV)
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On Tue, Jun 27, 2017 at 12:15 PM, Tom Hayward <tom at tomh.us> wrote:

> On Tue, Jun 27, 2017 at 9:50 AM, Loren Tedford <lorentedford at gmail.com>
> wrote:
> > That's great David however most people don't want to spend the time and
> > energy into getting a pfsense box and fighting with their provider unless
> > they can get reasonable idea of what is going on the network side of
> > things.. I agree ping's packet loss isn't everything but I have found
> that
> > mtr is still good basic for individuals looking to trouble shooting
> network
> > issues..
> >
> > I can't help what providers block out on their end of the network..
> However
> > ping times and percentage of packet loss is a good start just to get an
> > idea..
> >
> > I am sorry i didn't add nothing is perfect..
> >
> > So in curiosity side in the linux world what tool would you use to
> diagnose
> > your connections?? This is assuming you already use ping commands and
> > netstat commands etc..
>
> Loren,
>
> I think you missed David's point. He's saying that ICMP loss to core
> routers is not an accurate assessment of their packet forwarding
> ability. These routers have dedicated hardware to forward packets and
> can do so at line rate. However, when a ping comes in addressed to
> them, this does not get handled by the dedicated packet forwarding
> chip. It must be sent to the CPU for processing. If the CPU has some
> free time, it will parse the ICMP packet, find the echo request, and
> send an echo reply. If the CPU is busy, it'll just ignore the packet.
> Pings are the lowest priority in a router like this.
>
> To test for packet loss, use an end-to-end tool on the same protocol
> as your application. In this case, test for UDP loss and jitter. You
> can do that with a tool like iperf:
> https://iperf.fr/
>
> Tom KD7LXL
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