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1) If you do not have a connection to the ISP that owns the IP group for network 'A' then you cannot configure a machine to use network 'A'. UNLESS - network 'A' is used as an internal only network (like 10.x.x.x) - and translated to through a NAT router. Either way, the outside world would only be able to see network 'B' where a physical connection exists.
2) If you have two physical internet connections - one from ISP a -> network a, and the other from ISP b - network b, then to "link" between them, you would either 'a' link through the internet - this is the easiest option, as each connections default gateway will point to your WAN router (through the appropriate ISP). Otherwise you can set up your linux to route between the two networks. ifcfg-eth0:1 - set to net a, ifcfg-eth0:2 - set to net b; - routing between them enabled. Then on your other machines add a physical route to the "other network" specifying the appropriate network interface as the gateway for that route.
Good luck,
Gary Allen
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