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List:       nanog
Subject:    Re: [pfSense Support] Strange TCP connection behavior 2.0 RC2 (+3)
From:       Cameron Byrne <cb.list6 () gmail ! com>
Date:       2011-06-29 20:53:44
Message-ID: BANLkTikhDpHGSv-YOSr8iG+1e8R+nXS9rkVGytC5j-0dURVyCw () mail ! gmail ! com
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On Wed, Jun 29, 2011 at 1:48 PM, Mikael Abrahamsson <swmike@swm.pp.se> wrote:
> On Wed, 29 Jun 2011, Cameron Byrne wrote:
>
>> Sounds like a vendor specific issue :(
>
> Absolutely, but this is way too typical for these kinds of networks.
>
>> Good tcp vs default tcp will not close the window tight due to some
>> ephemeral loss or delay.  The penalties are generally too strong in tcp
>> for
>> the issues of delay and loss in 3g ... this is one of the main selling
>> points for tcp proxies .... but better done with modern tcp on the clients
>> instead of a middle box
>
> For what kind of devices? I can get full speed (870 kilobyte/s) on 7.2 HSPA
> with single TCP stream on a linux box. Are you referring to handsets that
> get improvement on high latency links?
>

Yes.  Smartphones on UMTS/HSPA have poor bandwidth-delay product,
hence it being common for mobile providers to proxy the TCP to open
windows faster.

Cameron
> --
> Mikael Abrahamsson    email: swmike@swm.pp.se
>


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