SW/HW for net connectivity balancing?

[postcd]

Hello, having two internet providers (two RJ45 cables) and my laptop one RJ45 input slot.

I would like to ask how is called the hardware/device (im looking for most elementary one) that can input these two internets and output one into my laptop. The device have to do basic thing, make sure internet is running while it can prefer one internet/connection over second one (my second internet has FUP and is slightly slower). Aim is higher uptime and less bothering with manual internet switching. A few seconds offline gap between switches is not that big problem.

I know some routers allow this (not sure how this function is named so i can google that), but i would like to avoid big, expensive, high power consumption router.

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Another option might be software based balancing of the internet connectivity, but im again unsure what to google and if this is viable. Im currently using Windows 10. I got an idea to get Raspberry Pi, maybe this can also be used as a router for two connections. But i need some keywords to google to find more info.

Hope anyone can help with smart, cheap solution?

Thank you

 

[Cromewell]

Something like this http://www.newegg.com/Product/Product.aspx?Item=N82E16833704101

 

[beers]

Most dual WAN type of appliances can do this, here's a decent write up of doing that on an ubiquiti router:

https://blog.voina.org/configure-dual-wan-with-edgerouter-poe/

Mainly you just need a higher gateway route metric on the standby and a watchdog ping that will go out of each interface and increase the metric on the primary during a failure so the secondary becomes active.