[iyonix-support] Re: Iyonix broadband access speeds

On 31 May 2007 Andrew Pinder <Andrew.Pinder@xxxxxxxxxxxxx> wrote:
> My ISP has asked to to use the TCP/IP Analyser on www.speedguide.net
> and to report the MTU and RWIN values.  MTU is Maximum Transmission
> Unit and can be set on the router.

Correct.

> RWIN is "Default TCP Receive WINdow".  I got different RWIN values
> from Firefox2/RO511 and IE6/Win98SE and the recommendation from both
> tests was to increase the value significantly

> I can't find any reference to RWIN anywhere in RISC OS - it isn't a
> system variable.  My questions are: In RO 5 who or what sets it?  The
> browser?  The OS?  The TCP/IP stack? The ADSL modem/router?  Do we
> need an upgrade to the OS to allow us to make full use of DSLmax?

I don't beleive its setable in RISC OS, although there could be a 
*sysctl option that does it. Tom "I was born to network" Hughes might 
know.

But in any case it isn't going to make much difference to your 
connection speed. Tweaking MTUs and RWINs are only for squeezing the 
last 100KB/s out of a couple of MB/s connection, and wont help if you 
are getting drastically less than you expect from your ADSL line.

Cheers
---Dave

-- 
______________________________________________________________________

David J. Ruck   Phone: +44- (0)7974 108301   Email: druck@xxxxxxxxxxxx
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