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Slow SSH over WLAN? How to check?

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  Slow SSH over WLAN? How to check? riveravaldez <riveravaldezmail@gmail.com> - 2020-09-03 15:50 +0200
    Re: Slow SSH over WLAN? How to check? Bob Weber <bobrweber@gmail.com> - 2020-09-03 18:30 +0200
      Re: Slow SSH over WLAN? How to check? conover@rahul.net (John Conover) - 2020-09-03 20:00 +0200
    Re: Slow SSH over WLAN? How to check? David Christensen <dpchrist@holgerdanske.com> - 2020-09-03 23:40 +0200
    Re: Slow SSH over WLAN? How to check? Lee <ler762@gmail.com> - 2020-09-05 16:40 +0200
      Re: Slow SSH over WLAN? How to check? rhkramer@gmail.com - 2020-09-05 17:20 +0200

#226667 — Slow SSH over WLAN? How to check?

Hi,

I'm under the impression that one of my LAN-SSH connections is working
poorly. When I SSH from a wired desktop machine (generic) to a
Wi-Fi-ed notebook (ThinkPadX220) things take irregular and seemingly
excessive amounts of time to happen (you type and the text appears a
moment later, etc.). This is just a
desktop→cable→router→Wi-Fi→notebook (W)LAN scheme.
Issue appears also logging from notebook to desktop.

Also I've been having some apparent poor performance in simple
web-navigation with that notebook (always through Wi-Fi), so, I'm
suspecting: maybe some issue with the firmware-iwlwifi?

$ lspci | grep "Network controller"
03:00.0 Network controller: Intel Corporation Centrino Advanced-N 6205
[Taylor Peak] (rev 34)

Both machines run Debian testing (updated).

What could I do to check/test the health/performance of the connection
in order to diagnose if there's effectively a problem?

Thanks a lot!

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#226677

[Multipart message — attachments visible in raw view] — view raw

On 9/3/20 9:48 AM, riveravaldez wrote:
> Hi,
>
> I'm under the impression that one of my LAN-SSH connections is working
> poorly. When I SSH from a wired desktop machine (generic) to a
> Wi-Fi-ed notebook (ThinkPadX220) things take irregular and seemingly
> excessive amounts of time to happen (you type and the text appears a
> moment later, etc.). This is just a
> desktop→cable→router→Wi-Fi→notebook (W)LAN scheme.
> Issue appears also logging from notebook to desktop.
>
> Also I've been having some apparent poor performance in simple
> web-navigation with that notebook (always through Wi-Fi), so, I'm
> suspecting: maybe some issue with the firmware-iwlwifi?
>
> $ lspci | grep "Network controller"
> 03:00.0 Network controller: Intel Corporation Centrino Advanced-N 6205
> [Taylor Peak] (rev 34)
>
> Both machines run Debian testing (updated).
>
> What could I do to check/test the health/performance of the connection
> in order to diagnose if there's effectively a problem?
>
> Thanks a lot!
>
Try iperf3.  Install on both machines and start one as a server and one as a 
client to see the network speed. Run with the -R option to see the reverse 
speed.  Make sure there is no firewall on the server machine or open the port 5201.


-- 


*...Bob*

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#226678

Might try variants of:

    ssh -v -v -v theuser@thedomain.tld

to see what ssh/sshd are doing.

    John

Bob Weber writes:
> On 9/3/20 9:48 AM, riveravaldez wrote:
> > Hi,
> >
> > I'm under the impression that one of my LAN-SSH connections is working
> > poorly. When I SSH from a wired desktop machine (generic) to a
> > Wi-Fi-ed notebook (ThinkPadX220) things take irregular and seemingly
> > excessive amounts of time to happen (you type and the text appears a
> > moment later, etc.). This is just a
> > desktop→cable→router→Wi-Fi→notebook (W)LAN scheme.
> > Issue appears also logging from notebook to desktop.
> >
> > Also I've been having some apparent poor performance in simple
> > web-navigation with that notebook (always through Wi-Fi), so, I'm
> > suspecting: maybe some issue with the firmware-iwlwifi?
> >
> > $ lspci | grep "Network controller"
> > 03:00.0 Network controller: Intel Corporation Centrino Advanced-N 6205
> > [Taylor Peak] (rev 34)
> >
> > Both machines run Debian testing (updated).
> >
> > What could I do to check/test the health/performance of the connection
> > in order to diagnose if there's effectively a problem?
> >
> > Thanks a lot!
> >
> Try iperf3.  Install on both machines and start one as a server and one as a 
> client to see the network speed. Run with the -R option to see the reverse 
> speed.  Make sure there is no firewall on the server machine or open the port 5201.
> 
> 
> -- 
> 
> 
> *...Bob*
> <html>
>   <head>
>     <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
>   </head>
>   <body>
>     <div class="moz-cite-prefix">On 9/3/20 9:48 AM, riveravaldez wrote:<br>
>     </div>
>     <blockquote type="cite"
> cite="mid:CAD8U+g_gzWDw7tuFMAXKPEYbSV9Cw1gp5VJMcx6n_BnFpm+fug@mail.gmail.com">
>       <pre class="moz-quote-pre" wrap="">Hi,
> 
> I'm under the impression that one of my LAN-SSH connections is working
> poorly. When I SSH from a wired desktop machine (generic) to a
> Wi-Fi-ed notebook (ThinkPadX220) things take irregular and seemingly
> excessive amounts of time to happen (you type and the text appears a
> moment later, etc.). This is just a
> desktop→cable→router→Wi-Fi→notebook (W)LAN scheme.
> Issue appears also logging from notebook to desktop.
> 
> Also I've been having some apparent poor performance in simple
> web-navigation with that notebook (always through Wi-Fi), so, I'm
> suspecting: maybe some issue with the firmware-iwlwifi?
> 
> $ lspci | grep "Network controller"
> 03:00.0 Network controller: Intel Corporation Centrino Advanced-N 6205
> [Taylor Peak] (rev 34)
> 
> Both machines run Debian testing (updated).
> 
> What could I do to check/test the health/performance of the connection
> in order to diagnose if there's effectively a problem?
> 
> Thanks a lot!
> 
> </pre>
>     </blockquote>
>     <p><font size="+1">Try iperf3.  Install on both machines and start
>         one as a server and one as a client to see the network speed. 
>         Run with the -R option to see the reverse speed.  Make sure
>         there is no firewall on the server machine or open the port
>         5201.</font></p>
>     <p><font size="+1"></font><br>
>     </p>
>     <div class="moz-signature">-- <br>
>       <br>
>       <br>
>       <b>...Bob</b><br>
>     </div>
>   </body>
> </html>

-- 

John Conover, conover@rahul.net, http://www.johncon.com/

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#226684

On 2020-09-03 06:48, riveravaldez wrote:
> Hi,
> 
> I'm under the impression that one of my LAN-SSH connections is working
> poorly. When I SSH from a wired desktop machine (generic) to a
> Wi-Fi-ed notebook (ThinkPadX220) things take irregular and seemingly
> excessive amounts of time to happen (you type and the text appears a
> moment later, etc.). This is just a
> desktop→cable→router→Wi-Fi→notebook (W)LAN scheme.
> Issue appears also logging from notebook to desktop.
> 
> Also I've been having some apparent poor performance in simple
> web-navigation with that notebook (always through Wi-Fi), so, I'm
> suspecting: maybe some issue with the firmware-iwlwifi?
> 
> $ lspci | grep "Network controller"
> 03:00.0 Network controller: Intel Corporation Centrino Advanced-N 6205
> [Taylor Peak] (rev 34)
> 
> Both machines run Debian testing (updated).
> 
> What could I do to check/test the health/performance of the connection
> in order to diagnose if there's effectively a problem?
> 
> Thanks a lot!


I assume your access point has utilities to determine what channel(s) 
are in use and to survey the radio environment to see how much traffic 
is on each channel.  Run it.  If your access point has the ability to 
dynamically choose a channel with less traffic, enable that feature.  If 
your access point does not, set the channel(s) to those with less 
traffic.  Also, check if the radio(s) have power settings -- it may be 
possible to increase the transmitter power.


How far is your laptop from the access point?  Is there a clear line of 
sight, or are there walls, ceilings, floors, or other objects in 
between; especially objects made of conductive materials and/or 
containing electric circuits?  The ideal situation is to have clear 
line-of-sight between your device and the access point.  In an indoor 
home environment, this is most readily accomplished by mounting an 
access point on the ceiling near the center of every room where Wi-Fi is 
used.  If you use Wi-Fi outdoors, mount an access point to the house 
wall facing the area.  You will want access points that are designed to 
work together.


David

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#226711

On 9/3/20, riveravaldez <riveravaldezmail@gmail.com> wrote:
> Hi,
>
> I'm under the impression that one of my LAN-SSH connections is working
> poorly. When I SSH from a wired desktop machine (generic) to a
> Wi-Fi-ed notebook (ThinkPadX220) things take irregular and seemingly
> excessive amounts of time to happen (you type and the text appears a
> moment later, etc.). This is just a
> desktop→cable→router→Wi-Fi→notebook (W)LAN scheme.
> Issue appears also logging from notebook to desktop.
>
> Also I've been having some apparent poor performance in simple
> web-navigation with that notebook (always through Wi-Fi), so, I'm
> suspecting: maybe some issue with the firmware-iwlwifi?
>
> $ lspci | grep "Network controller"
> 03:00.0 Network controller: Intel Corporation Centrino Advanced-N 6205
> [Taylor Peak] (rev 34)
>
> Both machines run Debian testing (updated).
>
> What could I do to check/test the health/performance of the connection
> in order to diagnose if there's effectively a problem?

You can use iperf to see how bad wireless thruput is.  LinSSID
  https://packages.debian.org/buster/linssid
is an easy way to find a relatively open wireless channel.

Then there's spectrum analyzers that show how much noise/interference
there is on wireless.. but they cost money and other than moving your
laptop or AP somewhere else there isn't a whole lot you can do about
interference :(  I suspect you'd be better off spending your money on
a better wireless card or a better AP.

Regards
Lee

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#226712

On Saturday, September 05, 2020 10:35:24 AM Lee wrote:
> On 9/3/20, riveravaldez <riveravaldezmail@gmail.com> wrote:

> > What could I do to check/test the health/performance of the connection
> > in order to diagnose if there's effectively a problem?
> 
> You can use iperf to see how bad wireless thruput is.  LinSSID
>   https://packages.debian.org/buster/linssid
> is an easy way to find a relatively open wireless channel.
> 
> Then there's spectrum analyzers that show how much noise/interference
> there is on wireless.. but they cost money and other than moving your
> laptop or AP somewhere else there isn't a whole lot you can do about
> interference :(  I suspect you'd be better off spending your money on
> a better wireless card or a better AP.

Or, installing some Cat 5 or 6 cable, possibly in combination with some 
additional WiFi WAPs in strategic locations.

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