Does LAN speed distributes among connected terminals on load

[Alexandru Juncu]

On Thu, Jan 12, 2012 at 10:43 AM, Manavendra Nath Manav
<mnm.kernel at gmail.com> wrote:
> On Wed, Jan 11, 2012 at 7:08 PM, Alexandru Juncu <alex.juncu at rosedu.org> wrote:
>> On Wed, Jan 11, 2012 at 12:21 PM, Manavendra Nath Manav
>> <mnm.kernel at gmail.com> wrote:
>>> Hi All,
>>>
>>> I have a 100Mbps LAN with 10 connected terminals through a Switch.
>>> Now, I understand 100Mbps is the max speed at which a terminal can
>>> send/receive data. If every terminal sends data at this speed, then
>>> does this speed distributes/divides according to load, or is it
>>> dedicated for each terminal. How to measure it?
>>>
>>> --
>>> Manavendra Nath Manav
>>
>> It's rather a generic question... let me try to begin to answer it.
>> First of all, the speed of the link is 100mbps wire speed. There is a
>> lot of overhead caused by different protocols (I redirect you to learn
>> about the OSI or TCP/IP stacks and about encapsulations). So the speed
>> is way lower than 100 when doing anything over the network.
>>
>> Now, the question about if the speed is shared is hard to answer. The
>> straight forward answer is no. Traffic would be shared if the network
>> would be connected via a hub ( I doubt hubs are actually used in
>> modern networks). Switches are 'smart' so they don't push traffic in
>> parts of the network where is not needed, so, theoretically, the
>> bandwidth is not share.
>>
>> However, most of the traffic we have in a network is not inside our
>> Local Area Network, but with the Internet and all that traffic passes
>> through the gateway. So the gateway would be the bottleneck and the
>> traffic is 'distributed' among the hosts in the network.
>>
>> This is a very brief answer to what you said... maybe if you could
>> provide some further details on what exactly you want to do, you will
>> receive a better answer.
>>
>>
>> --
>> Alexandru Juncu
>>
>> ROSEdu
>> http://rosedu.org
>
> Hi Alexandru,
>
> Thanks for the detailed answer. In my 100Mbps LAN setup, I have
> several clients/terminals connected to a server. The problem is that
> the server is connected to the LAN via a GPRS module whose bandwidth
> is very less (128kbps). So, different clients are parallely sending
> data to server but most are getting timed-out because of bandwidth
> constraints. My question is how I can verify that packets are being
> dropped/timed-out because of bandwidth at the GPRS interface? Is there
> any tool to do this?

'tc' comes to mind...