Answer 1:
A lot depends on your ISP and the routers you're using.
Typically, the router will have a specific IP assigned to it (either static or dynamic). Therefore, with 2 ISDN modems and 2 routers, you'd end up with two IP addresses.
You'd have to talk to your ISP to see if they support connection bonding, thereby allowing both modems to combine into one bigger pipe.
The alternative would be a tool such as Vicom's InterGate which will spread traffic across multiple connections: Install InterGate on one system in your network and have all other systems point their default gateway to the InterGate machine. Intergate will then spread the traffic across available links
A lot depends on your ISP and the routers you're using.
Typically, the router will have a specific IP assigned to it (either static or dynamic). Therefore, with 2 ISDN modems and 2 routers, you'd end up with two IP addresses.
You'd have to talk to your ISP to see if they support connection bonding, thereby allowing both modems to combine into one bigger pipe.
The alternative would be a tool such as Vicom's InterGate which will spread traffic across multiple connections: Install InterGate on one system in your network and have all other systems point their default gateway to the InterGate machine. Intergate will then spread the traffic across available links