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HOw to setup two routers from two different ISPs to share same network

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Correct; a fundamental part of the TCP/IP protocol is that packets can only follow one route at a time, and the replies to Internet requests from one source have to go back to where they came from.

Only a dual-wan router can make this work, as it can decide what is the best route for each traffic stream at any given moment.

You can do bandwidth aggregation at the link layer, not the network layer. A dual wan router can do either failover or load blancing, but cannot aggregate bandwidth.