I am using Debian wheezy. I am using a limited connection for Internet with 2.5 GB data limit. So I shouldn't use Internet beyond that limit. are there any available data monitors which can do me such functionality.
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vnstatd. It is a daemon that runs in the background and periodically polls your network interface and records the amount of data transmitted or received . This is stored in a database. The
vnstat command lets you view bandwidth consumption broken down by day or month (very useful if your bandwidth allotment is monthly).
Debian has a vnstat package which I believe contains