[maemo-users] Iphone + tethering - No Way

From: John Holmblad jholmblad at acadiasecurenets.com
Date: Sat Mar 14 00:46:22 EET 2009

it occurs to me that the bottleneck is probably due to the fact that 

    a) the computer that is being reached by the RDP session and where
    the www browser is running is behind an Asymmetric DSL circuit  to
    the Internet. I ran a speed test on that connection and the
    bandwidth in the direction TO the Internet and the tethered laptop
    from that computer is only ~369 kbps measured using the bandwidth
    test at the www page whose url is


combined with the fact that

    b) on the tethered laptop side of the connection the measured
    bandwidth in the direction from the laptop + mobile device TO the
    Internet is only ~64kbps as measured using the same bandwidth test.

Thus the large and frequent (due to the dancing baloney etc) 
differential graphics frames being "played out" from the computer to the 
laptop RDP client at the above average bit rate of ~369 kbps combined 
with the TCP ACK packets being returned at the ~64kbps bit rate are 
conspiring to deliver relatively poor performance,

One of the reasons why a direct visit to a www site (i.e. not through 
the RDP/VNC/Server based browser) but through a browser running on the 
tethered laptop seems to work better is that, of course, the browser can 
and does open up multiple TCP connections to grab the image and other 
content from the visited www site wherever that www site is located on 
the Internet.

Best Regards,


John Holmblad

 Acadia Secure Networks, LLC

Jonathan Greene wrote:
> I thought when you remoted into a machine it used the local connection
> on that device and not your connection.  You'd only need to receive
> the differences in the screen but that should not be too terrible.  I
> do plenty of streaming and tethering (together sometimes even) and 2Gb
> is a lot of data.  I have an hour each day in either direction to burn
> on my commute.
> The text message is your voicemail notice coming through as visual
> voicemail on a non-compatible device.  I use Spinvox to which I've
> forwarded my voicemail and they send back a text version of the
> message - as well as in my email.  I couldn't take the BS from ATT
> anymore.
> On Wed, Mar 11, 2009 at 12:21 AM, Brad Midgley <bmidgley at gmail.com> wrote:
>> Hey
>> I've also used the iPhone sim for data etc in a less locked-down
>> device. Have you noticed the strange text messages you get whenever
>> there's a status change on the voicemailbox? It can be annoying. The
>> text message is a URL and appears to be related to iPhone's special
>> handling of voicemail.
>> It would be nice if we could figure out their special voicemail
>> handler, or, barring that, just filter out these messages.
>> Jonathan Greene <atmasphere at atmasphere.net> wrote:
>>> I've been using the original iPhone SIM in various devices for years
>>> now and I tether all kinds of mobile devices from laptops, N810,
>>> netbooks ... no issues. I've cleared 2Gb a few times, but 5 would be
>>> more like your only connection ...
>> --
>> Brad Midgley

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