On Tue, Jul 17, 2018 at 07:33:40PM -0700, pe...@easthope.ca wrote:
> 
> Seems the data measured by the carrier is larger than the data 
> estimated by the users.  The accounting by the carrier might be double 
> that estimated by the users.  They were told or read that the carrier 
> charges for transmission between router & client machine as well as 
> between router and cell tower.  That could explain a factor of two  
> but to me this seems irrational.  The carrier shouldn't be concerned 
> with transmission within the LAN.  The only explanation I can imagine 
> is that activity within the LAN causes delays in rounter operation, 
> which cause delays in communication between router and cell tower, 
> which degrades efficiency..
> 
It sounds like perhaps MTU or clamp MSS might need adjusting.  I can
envision a situation where the router sends out packets that are just
slightly larger than what the cell tower will route, causing the tower
to split them.  It would double the number of packets and if the ISP is
counting packets instead of bytes, then it would easily explain a factor
of 2 increase.

Regards,

-Roberto

-- 
Roberto C. Sánchez

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