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Is it possible to create a fault tolerance between two USB net sticks?

My 3G ISP only gives 3GB of traffic for a month, and when in stream a video from my outdoor cam it gets to the limit pretty fast (few days).

Is there a way to switch to another USB modem that I have from other provider when the first is out of bandwidth?

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Good question, and welcome to Super User! – Thor Dec 27 '13 at 19:10
thanks, look like one of the best forums in the net.. – anerarn Dec 28 '13 at 8:18
I would put emphasis on the fact that Super User is not a forum. ;) – Thor Dec 28 '13 at 17:00

See the two top answers to the question "Windows program to limit bandwidth of other programs?"..

First answer

I use NetBalancer. While its a paid software, a free version exists, but can restrict traffic on upto 5 processes at a time.

Net Balancer Free

Second answer

I use Net Limiter, which is free.

NetLimiter is an ultimate internet traffic control and monitoring tool designed for Windows. You can use NetLimiter to set download/upload transfer rate limits for applications or even single connection and monitor their internet traffic.

Along with this unique feature, Netlimiter offers comprehensive set of internet statistical tools. It includes real-time traffic measurement and long-term per-application internet traffic statistics

At the very least it seems that NetLimiter will allow you to limit the amount of data per network adapter, though I cannot personally vouch that it supports an automatic change to another adapter.

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