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When you connect a client to a network with private addressing as per RFC 1918, your WAN router needs to translate the source host's private source address to its own public address as source (source NAT). For the returning traffic, this translation needs to be reversed. Accordingly, from the perspective of an external (public) host, all hosts behind the ...


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Some connection between the two ISPs is needed. Dedicated fibers (for example in a datacenter they're both present in) is very common. But there are other possibilities: a layer 2 connection (for example a MPLS circuit provided by a carrier) can be used, or a BGP session can be established over an internet exchange point. Basically, you need some way to be ...


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For hosts on one network to talk to another network, you require a gateway/router in between and the hosts to have (default) routes that point directly or indirectly to the remote network. You can have all hosts use their local router as default gateway, interconnect the routers and set up a static route on each router for the remote network. Alternatively, ...


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