[Dshield] Any reaonable way to measure connectivity speed?....
jbeck80 at hotmail.com
Tue Mar 30 16:34:34 GMT 2004
They are all correct in the connection speeds of the dsl's, but that just
checks each sites bandwidth to the testing server, (which in theory should
be the same, but we know it fluxuates). The real question is the mechinism
of remote access, are you tunneling? Or Accessing remote console via term
serv or pcanywhere, etc. If tunnel, check the latency of the tunnel with
ping or packet generator from one home to work, I remember a neat tool from
Lucent that uses ICMP (same as traceroute) to show times of latency between
all hops between you and outside connection. Another aspect in the tunnel
is IKE likes to fragment, the firewall logs will show your tranmissions, at
least the sonicwalls do, they will show fragmented packets along the vpn
tunnel. In my experience vpn over dsl or cable for running remote sessions
is irratic (both sites are dsl or broadband), it can be good then change
then change back. I even tried to use the QOS of the firewall to carve out
bandwidth and it did not seem to matter, fragmenting kills, also the router
that feeds the sessions may be using broadcast (netbios over ip) which adds
to latency. I even found that running pcany session outside the tunnel is
way faster than inside the tunnel, but extremely less secure, trade for
Hope this helps your endeavors, I know it is not a open shut case, there are
>From: "Jon R. Kibler" <Jon.Kibler at aset.com>
>Reply-To: General DShield Discussion List <list at dshield.org>
>To: General DShield Discussion List <list at dshield.org>
>Subject: Re: [Dshield] Any reaonable way to measure connectivity speed?....
>Date: Tue, 30 Mar 2004 09:13:46 -0500
>Bob Hillegas wrote:
> > I'm telecommuting from Texas to Tennesee. I have noticed this past
> > weekend a large loss of throughput. Is there any way on a linux box to
> > quantify connectivity? I would like to know where the slowdown occurs.
> > In absence of being able to do that, I would like to be able to quantify
> > what I am subjectively seeing in screen responsiveness so that I can
> > know if changes I make are helping, hurting, or neutral.
>Most xDSL and cable modems allow you to display connection bit-rate
>info that should give you a reasonable measure of data-line speed.
>The traceroute command will allow you to find any net node that is
>causing a delay.
>The ping command can be used to monitor the consistency of transit times.
>There are several web sites that will allow you to run throughput
>speed tests. The one that comes to mind is:
>Hope this helps!
>Jon R. Kibler
>Chief Technical Officer
>Charleston, SC USA
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