[TriLUG] Web Site access testing

[Leonard Boyle via TriLUG]

Good Evening

Here are a few thoughts, Hopefully I am not repeating something already
said or not correct.

1) when I see a ping command fail and another command work, I think that
someone has blocked icmp api's used by ping

see https://www.redhat.com/sysadmin/ping-traceroute-netstat for more
detail.

You can try. The tcptraceroute command.
 or
Searching tonight I see there are the linux commands hping2 and hping3
which should work, but I have never tried.

2) Windows comes with a command called pathping which looks like a simple
version of ping plotter.

---- Looking at Brendan Gregg's book "System Performance"

3) There is the mtr command. This was installed on the linux images with my
last job, but it was old and bug ridden.
this command is akin to the windows pathping plus more.
The software is on github and appears to have more current support

https://github.com/traviscross/mtr

len boyle

On Tue, Aug 17, 2021 at 6:15 PM Stephen P. Schaefer via TriLUG <
trilug at trilug.org> wrote:

> Supposed to be a Haiku, but corrupted by my source:
>
> "There's no way it's DNS"
>
> On 8/17/21 5:54 PM, Stephen P. Schaefer via TriLUG wrote:
> > That 30 second delay feels like a failed DNS lookup - and you did say
> > there isn't a DNS entry for it.
> >
> >      - Stephen
> >
> >      It’s not DNS
> >      There is a no way it’s DNS
> >      It was DNS
> >
> >          - Vivek Gite(?)
> >
> > On 8/17/21 5:37 PM, Brian McCullough via TriLUG wrote:
> >> On Tue, Aug 17, 2021 at 05:11:39PM -0400, David Brain wrote:
> >>> Hi,
> >>
> >> Hi David,
> >>
> >>
> >>> Unless it's a very simple page it may be worth capturing a HAR file and
> >>> seeing where exactly the slowness is occurring.
> >>
> >> Wow!  Learn something new every day ( or most of them )!  Now I get to
> >> spend the next week learning to understand what I just captured.
> >>
> >> So far, I have noticed that it starts out with a 301, redirecting to
> >> exactly the same URL.
> >>
> >> The main page load ( time to Document Ready ) is on the order of 30
> >> seconds, the other components are much quicker.
> >>
> >>
> >> More to learn, and analyze.
> >>
> >>
> >>> David.
> >>
> >>
> >> Thank you David.
> >>
> >> Brian
> >>
> --
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