My usage doesn't = my ISP usage

With vista, I check my internet usage in the Network and Sharing Centre daily when shutting down, I shut down the satellite modem at the same time.
Yet when I check my usage at my ISP's website, they are constantly 10 or 20 or more mb a day over what my Network and sharing Centre has my usage as.
Anyone know Why?
I sometimes go over my usage limit because my ISP has me about 500mb per month over what I have added up daily from my Network and Sharing Centre.
 

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Mooly

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Maybe some packet data between just the ISP and the modem. I think when you shut down and restart a modem that some data transfer takes place for authentication and so on. These days 10 to 20 mb is considered 'trivial' although I appreciate that on a restricted or metered connection every byte counts. It all sounds perfectly normal anyhow. Do you have to shut the modem down ?
 

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No I don't have to shut down the modem, but I do.
What you said makes sense, I wonder if i didn't turn the modem off then there might not be that exchange between my ISP and my modem for authentication and so on, every day.
Thanks for that.
 

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Aargh, I left on the modem but my ISP usage was still 26mb over Network and Sharing Center usage for the day.
 

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Mooly

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It was worth trying. Maybe it is just the ISP accessing the modem every so often (or the other way around) for verification of some sort.


I know I said earlier that it was a small amount, but actually when you multiply it out its not. Its over 0.8Gb in a 31 day month, and when I think that back in 2007 I was on a 2Gb allowance... so not so trivial after all.

Perhaps an email to your ISP might be worth pursuing, or seeing if there is a forum for your router manufacturer where you could ask specifically.
 

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