dual gigabit router use?

Hi all. My friend tools me about dual gigabit router the other day and I honestly didn’t believe him. I searched online but didn’t find really what I was looking for, what I found were the routers like:
http://www.newegg.com/Product/Product.aspx?Item=33-150-182
Now I was wondering if someone can help me and tell me if this is true or not.
What he told me was….. I can connect AT&T Internet to 1 port, then Comcast Internet to another port, and get both speeds combined?
What I want to know if that is true, would this be true as well. IE:
AT&T Internet max download 1 file @ 2Mbps
Comcast Internet max download 1 file @ 1Mbps
(Same file from same host)
If I connected both Internet connections to that router, then hardwire it on Ethernet to my PC. Would I download that 1 file at a combined rate of 3Mbps?
I find it so strange but I want to know cause this would be super awesome if I can combines two ISP Internet live and combine speed to download/upload faster. Thanks.
Answer #1
No, that’s not accurate. What you CAN do with two ISPs into a single supporting firewall (and note that these are almost always commercial grade firewalls) is load balancing and/or fail-over. Load balancing allows traffic from multiple clients/protocols to be weighted and get directed out a specific external connection. Fail-over means that you normally use a specific ISP for internet (usually the fastest), but if that goes down, you are automatically directed over the other ISP.
You can’t have two internet connections servicing a single machine under normal conditions because the packets that you request go to a single host who sends all of the packets back to a single destination address. It can’t get split up to multiple destinations and then later rejoined. There are exceptions to having multiple adapters in your computer, but you wouldn’t be using both ISPs at the same time for general browsing.
Answer #2
Your router won’t do that but this software seems to be what you’re looking for:
http://www.connectify.me/dispatch/
Answer #3
Ask your ISP if they do “line-bonding”
Answer #4
Ty For all the info. I knew someone here would always be able to help.