Can we get addition speed of multiple ISP's?
isp1 = 5 mbps isp2 = 6 mbps total = 11 mbps
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Link aggregation only works in networks where you have 2 network cards that can do it, hooked up to a router that can do link aggregation also. You'll be looking at doubled network speed in this case. But you can't use multiple net connections in the same manner. It just doesn't work that way.
No. Even in multi-homed corporate environments with enormous budgets with a staff of professional network engineers, all inbound traffic to a particular host address sent from an arbitrary remote network will be delivered via only one ISP at a time. Load-balancing strategies can be used to make certain remote networks prefer one ISP over the other, but for an individual session, its top inbound rate cannot be faster than the fastest link to the ISP.
In the case of identical sized pipes to multiple ISPs, per-packet outbound load balancing can be configured on even modest enterprise-level routers, for an overall increase in outbound bandwidth, but it's unlikely that this extra bandwidth will result in a particular session's transfer rate to exceed the rate of a single pipe.