[c-nsp] Effect of simultaneous TCP sessions on bandwidth

[Youssef Bengelloun-Zahr]

Hello Roland,

Yes, we have checked counters on all ports under our responsability, carriers' equipments and third party LL provider.

At first, we discovered speed/duplex mismatch between WE and CPE on customer site, this has been fixed since then.

Then, we saw output discards on CPE device (meaning upload from customer site towards datacenter). I believe this is due to the fact that carriers' port is FE only and cutomers' port is GE.

Carrier proposed to setup some kind of media converter between both equipments but I'm not sur this could help...

Y.



Le 10 nov. 2013 à 16:06, "Dobbins, Roland" <rdobbins at arbor.net> a écrit :

> 
> On Nov 10, 2013, at 1:09 PM, Youssef Bengelloun-Zahr <youssef at 720.fr> wrote:
> 
>> Yes, sorry but I forgot to mention that we have activated every possible TCP extension on servers in order to support latency effects over long WAN
>> distances.
> 
> Due to the nature of TCP, delay-product has throughput effects even if everything has been optimized, stack- and application-wise.
> 
> That being said, have you been able to check the layer-2 stats on each of the ports in the chain, and verified that speed/duplex settings are either auto-negotiating properly or are hand-configured in matching configurations on each side of each link?
> 
> -----------------------------------------------------------------------
> Roland Dobbins <rdobbins at arbor.net> // <http://www.arbornetworks.com>
> 
>      Luck is the residue of opportunity and design.
> 
>               -- John Milton
> 
> 
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