<div dir="ltr">Tom can you explain a bit more on iperf? How to install and run from command line and possibly from windows?<div class="gmail_extra"><br clear="all"><div><div class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div style="font-size:small;font-family:arial">Loren Tedford (KC9ZHV) </div><div style="font-size:small;font-family:arial">Phone:</div><div style="font-size:small"><font face="arial">Fax: </font><br><font face="arial">Email: </font><a href="mailto:lorentedford@gmail.com" style="color:rgb(17,85,204);font-family:arial" target="_blank">lorentedford@gmail.com</a></div><div style="font-size:small">Email: <a href="mailto:KC9ZHV@KC9ZHV.com" style="color:rgb(17,85,204)" target="_blank">KC9ZHV@KC9ZHV.com</a></div><div style="font-size:small;font-family:arial"><a href="http://www.lorentedford.com/" style="color:rgb(17,85,204)" target="_blank">http://www.lorentedford.com</a></div><div style="font-size:small;font-family:arial"><a href="http://www.kc9zhv.com/" style="color:rgb(17,85,204)" target="_blank">http://www.kc9zhv.com</a></div><div style="font-size:small;font-family:arial"><a href="http://forum.kc9zhv.com/" style="color:rgb(17,85,204)" target="_blank">http://forum.kc9zhv.com</a></div><div style="font-size:small;font-family:arial"><a href="http://hub.kc9zhv.com/" style="color:rgb(17,85,204)" target="_blank">http://hub.kc9zhv.com</a></div><div style="font-size:small"><a href="http://ltcraft.net/" style="color:rgb(17,85,204)" target="_blank">http://Ltcraft.net<span></span><span></span></a></div><div style="font-size:small"><a href="http://voipham.com" target="_blank">http://voipham.com</a></div></div></div></div></div></div>
<br><div class="gmail_quote">On Tue, Jun 27, 2017 at 12:15 PM, Tom Hayward <span dir="ltr"><<a href="mailto:tom@tomh.us" target="_blank">tom@tomh.us</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><span class="">On Tue, Jun 27, 2017 at 9:50 AM, Loren Tedford <<a href="mailto:lorentedford@gmail.com">lorentedford@gmail.com</a>> wrote:<br>
> That's great David however most people don't want to spend the time and<br>
> energy into getting a pfsense box and fighting with their provider unless<br>
> they can get reasonable idea of what is going on the network side of<br>
> things.. I agree ping's packet loss isn't everything but I have found that<br>
> mtr is still good basic for individuals looking to trouble shooting network<br>
> issues..<br>
><br>
> I can't help what providers block out on their end of the network.. However<br>
> ping times and percentage of packet loss is a good start just to get an<br>
> idea..<br>
><br>
> I am sorry i didn't add nothing is perfect..<br>
><br>
> So in curiosity side in the linux world what tool would you use to diagnose<br>
> your connections?? This is assuming you already use ping commands and<br>
> netstat commands etc..<br>
<br>
</span>Loren,<br>
<br>
I think you missed David's point. He's saying that ICMP loss to core<br>
routers is not an accurate assessment of their packet forwarding<br>
ability. These routers have dedicated hardware to forward packets and<br>
can do so at line rate. However, when a ping comes in addressed to<br>
them, this does not get handled by the dedicated packet forwarding<br>
chip. It must be sent to the CPU for processing. If the CPU has some<br>
free time, it will parse the ICMP packet, find the echo request, and<br>
send an echo reply. If the CPU is busy, it'll just ignore the packet.<br>
Pings are the lowest priority in a router like this.<br>
<br>
To test for packet loss, use an end-to-end tool on the same protocol<br>
as your application. In this case, test for UDP loss and jitter. You<br>
can do that with a tool like iperf:<br>
<a href="https://iperf.fr/" rel="noreferrer" target="_blank">https://iperf.fr/</a><br>
<br>
Tom KD7LXL<br>
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