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I'm planning on having a 4G LTE USB Modem plugged into a server computer at home. I will then go somewhere else. I'm afraid it will disconnect, and if it does not work I would have to go home to fix it.

Is there a possibility to automatically remount / reconnect USB 4G Modem with a command every 12 hours?

It's a ZTE MF821D Modem, which means, it will connect to internet just by plug out and in.

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To run a task at scheduled times, use cron. This isn't the best solution: it would be better to reconnect if the connection is dropped. –  Gilles Sep 21 '13 at 12:47

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You can do that very easily , while you are creating the connection for Mobile broadband ,look at the 1st TAB[ General ] there you can have the option as Automatically connect to this network when it is available .

so you even because of network problem you got disconnected your connection , it will reconnect again after sometime when network is available. so you can automate it very easily.enter image description here

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Okay, but I dont need reconnect, thanks anyway, but Im aware it bugs often, eth1 dissapear, network closes, etc etc, I need to restart USB...... –  Marcus Sep 21 '13 at 14:55
    
@Marcus ok along with the answer I gave you ,restart your network manager and modem manager for 12 hours once. you can create a bash script for that and then by using cron you can automate the action.\ –  AgentCool Sep 21 '13 at 16:13
    
nop, its buggy USB modem, when I start computer it doesnt even start: I have to replug it. Sometimes it just disconnect. I want to play it safe, so I use: eject /dev/sr0, and wait 10 seconds, it will reconnect. Thanks for answer. –  Marcus Sep 21 '13 at 17:06

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