What are you trying to achieve? Some sort of NIC teaming?
Well, maybe you're right it will increase the speed in your local network.
But once it goes to your Internet service provider, then you are limited to the speed you're subscribed to. Unless, of course you own the ISP then you can set or throttle your own bandwidth.
Search the web with these keyword: a. NIC Teaming b. NIC Bonding
Here's one link:
https://access.redhat.com/documentat...k_Teaming.html