2 internet connections on a single PC

Solution 1:

You can, if is what you want, use 2 connections as one. E.g.:

Connection 1: 100Kb/s
Connection 2: 350Kb/s
Resulting connection: 450Kb/s

This is achieved using the technique Bonding.

How many bonding devices can I have? There is no limit.

It's a bit complicated to configure it properly, so I recommend you read this article completely, and take away all doubts before starting. And in this page you will see FAQs, advanced options and all the information in one single page.

Solution 2:

you can use ifup and ifdown to enable and disable the connections without unplugging them . thats the easy way i know to switch between connections . open a terminal a type as

sudo ifdown eth0

to disable a connection with name eth0 and

sudo ifup eth0

to enable the connection & this way also applicable to wireless connections also . just replace the connection name with your wireless connection name .

you can list all your connections with ifconfig -a

hope that helps .