Re: bandwidth between two endpoints

[Martin Visser <martinvisser99 () gmail com>]

Andrej,

Bandwidth is generally considered to be a measure of the maximum amount of
traffic that could travel between two points. This is a function of things
such as the physical media and the provisioning by the provider of the
service, that might include shaping and the like.

Wireshark can't really measure this directly, however it is possible to
infer it by measuring the maximum throughput of traffic between those
points, which it can measure. If you believe that a set of flows of traffic
is running at close to the maximum bandwidth, the best way would be to use
the IO Graph function in the Statistics menu. Then  enter a "Filter" that
represents the flow(s)  that you think will represent the traffic when the
pipe if full. For instance "ip.src==1.2.3.4 and ip.dst=4.3.2.1". Then click
on the "Graph" button and scroll until you reach a point which shows where
the maximum occurs. Unfortunately the graph doesn't provide a value beyond
what you can "eyeball" from the graph.

(Just remember that while a lot of protocols try to take advantage of all of
the available bandwidth, it is not always the case. Some traffic type like,
multimedia streaming or VoIP often have a fixed data rate so never go faster
even if more available bandwidth is available. Other like a normal HTTP
download will usually try to "max out" the link, however they may never
reach it because of things like packet loss, delay, and so on. I know I am
being a pedant, but I'm just making the point bandwidth and throughput are
not the same thing)

Regards, Martin

MartinVisser99 () gmail com


On Sat, May 22, 2010 at 6:40 PM, Andrej van der Zee <
andrejvanderzee () gmail com> wrote:

> Hi,
>
> I was wondering if it is possible to get the bandwidth between two
> endpoints in Wireshark. I want to know how fast a particular
> connection is.
>
> Thank you,
> Andrej
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