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All of the following examples should provide full TCP/IP connectivity,
using IPs. For simplicity, I haven't provided any name resolution.:

<all masks are 255.255.255.0, unless noted

************* One Router *************

segment1 --- NT router --- segment2

NT router:

NIC1: 192.168.100.1 (segment1)
NIC2: 192.168.200.1 (segment2)
IP forwarding enabled.
Both default gateways blank.

Segment1 machines:

IP: 192.168.100.2 - 192.168.100.254
Default Gateway: 192.168.100.1

Segment2 machines:

IP: 192.168.200.2 - 192.168.200.254
Default Gateway: 192.168.200.1

************* Two Routers *************

segment1 --- NT router --- segment2 --- cisco --- segment3

NT router:

NIC1: 192.168.100.1 (segment1)
NIC2: 192.168.200.1 (segment2)
IP forwarding enabled.
Default Gateway: 192.168.200.2

Cisco:

NIC1: 192.168.200.2 (segment2)
NIC1: 192.168.250.1 (segment3)
Default Gateway: 192.168.200.1

Segment1 machines:

IP: 192.168.100.2 - 192.168.100.254
Default Gateway: 192.168.100.1

Segment2 machines:

IP: 192.168.200.3 - 192.168.200.254
Default Gateway: 192.168.200.1 (or 191.168.200.2)

Segment3 machines:

IP: 192.168.250.2 - 192.168.250.254
Default Gateway: 192.168.250.1

************* Three Routers *************

segment1 --- NT router --- segment2 --- Cisco --- segment3
|
--------- Bay ----- segment4

NT router:

NIC1: 192.168.100.1 (segment1)
NIC2: 192.168.200.1 (segment2)
IP forwarding enabled.
Default Gateway: 192.168.200.2
route add -p 10.100.0.0 mask 255.255.0.0 192.168.100.2

Cisco:

NIC1: 192.168.200.2 (segment2)
NIC1: 192.168.250.1 (segment3)
Default Gateway: 192.168.200.1

Bay Router:

NIC1: 192.168.100.2 (segment1)
NIC2: 10.100.0.1 <mask 255.255.0.0 (segment4)
Default Gateway: 192.160.100.1

Segment1 machines:

IP: 192.168.100.3 - 192.168.100.254
Default Gateway: 192.168.100.1 (or 192.168.100.2)

Segment2 machines:

IP: 192.168.200.3 - 192.168.200.254
Default Gateway: 192.168.200.1 (or 191.168.200.2)

Segment3 machines:

IP: 192.168.250.2 - 192.168.250.254
Default Gateway: 192.168.250.1

Segment4 machines:

IP: 10.100.0.0 <mask 255.255.0.0
Default Gateway: 10.100.0.1

Note: The static route added to the NT in the 3rd example. You can either do this or implement one of the router protocols (e.g. RIP) on at least the NT and the BAY.

Note: In some cases, you have an option on which DG to use on the segment clients (or even the routers). There can be many reasons to favor one over the other, but probably the most common determining factor is traffic patterns (i.e. use the DG that is attached to the most common destination network).

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