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Question on multiple ISP's?

Well it may sound strange but i wanna see if its possible.

My company will run live media streaming website and what we would like to do is get 3 different ISP's ( 3 different pipes of bandwith, each 100 meg) and all 3 of the ISP's have different peering and backbones we thought if there was way to know like if person is coming from Australia we take them to the already specified ISP who has best peering to Australia , another one comes from East Coast we take them trough different ISP that has better peering etc, so its pretty much combining 3 different bandwith pipes and send users to best available at the moment for their location,is that possible and how?
 
Yes its possible. You'll probably have to run full BGP tables though to do it so it could get a litte complicated.

BGP is the routing protocol that runs the Internet. It is how every single internet router knows where everybody is. It works by communicating with your ISPs routers and exchaning routing and path information. So when your router responds to a client it will "normally" select the best path to send it.

You would want to ask your provider "What do you support for multi-homing and BGP configurations?". Then maybe get on a conference call with all three providers to work out what they will and will not support from a customer perspective. Normally tier 1 providers have no trouble at all peering up with you, their BGP guys are insane and are very good at preventing you from mucking with their routing.

What your asking is a little advanced in networking and I would recommend you get somebody to do it for you. Otherwise you could end up being what is called a "transit-AS" where you would be actively routing other peoples traffic on YOUR links.
 
A second option is to leave the connection action up to the user. Make three links for getting this streaming media, labeled appropriately. This requires a depending on the user, but most folks will blindly follow a suggested link, assuming it will get them better performance (which it usually does). The advantage to this is nearly zero overhead or setup. You can try that part out for free, if you have the three ISP's already.
 
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