I myself using dual Wan Asus router but it's basically for backup purpose like it'll automatically switches to the second wan if the first wan is down , it does provide some load balancing features too but you can't really use them solely as load balancer.
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To follow up with this, some high end ASUS routers have Dual WAN but I'm not sure how effective load balancing would be on a simple SOHO router.
What you're looking for is some carrier grade equipment that can load balance your connections, as Asad said, you can't merge them and have one single connection of 600 Mbps as each connection is assigned a different IP address and there are tons of other complications as to why this isn't possible unless the ISP itself offers such a feature.
Thank You But [MENTION=138104]asaddon[/MENTION]e How Much Those Router Will Cost???And IF i can't Merge 2 Connection Then It Is okay For me Just Need 1 Gigabit Connection Which I can Get from fiberlink With 3 200Mbps Connections.With your 1Gbps you don't really need to know it but just to explain how things work.
There is no way combining bandwidth can be done without the ISP providing such a specific service. ( And I don't think FiberLink does )
Computers are Not mind readers. If the two connections are not synchronized at the source your computer would not know how to combine it to a coherent page.
What you can achieve by two separate internet lines is load balancing.
Like if you have two separate 200Mbps lines each capable of downloading at 25MBps. With Load Balancing one single file will not exceed download speed of 25MB/sec. However you can download 2 files at 25MB/sec. or 4 files at 12.5MB/sec etc without choking your whole network.
For load balancing you need a dual wan router. This type of Router have two WAN connections for two Broadband Modems and they would manage the Internet traffic to the LAN in the most efficient way.
They are industrial grade routers and cost way more than the cheap house consumer routers.
P.S For three WAN connection you need even more expensive load balancing device.
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