Windows 7: ICS with 2 routers, yay

i dont what type of connection i have setup, but it seems to break a few rules, or atleast it just works where normally the setup wouldnt. it has been tested so its pretty stable too.

what did i just setup, can someone draw me a network map, or a flow chart, or something explaining this set up, so i can clearly see which router is the most protected network, and if the secondary subnet is even justified?

router 1(permiter network WAN side?)
LAN-default(192.168.1.1,255.255.255.0-dhcp on) second NIC card on host machine connected here for LAN connectivity
WAN- set to auto(dynamic) - primary NIC on host machine using ICS share is plugged into the WAN(INET) port or router - (grabs ip lease from ICS (192.168.137.51-255.255.255.0)

2 output ports on Router 1 are used up, 1 for the output to Router 2, and one for the private access NIC on machine 1, and the WAN port is also used from the primary NIC on machine 1.

router 2 (wlan subnet access point. protected network?)
only for wireless connectivity isp throughput is taken from random Router1 output.
LAN - default (192.168.2.1,255.255.255.0 - dhcp on)
WAN - set to auto(dynamic) - ethernet cable from an output on Router1, connected into WAN(INET) port (picks up ip lease from Router 1) (gets an ip something like 192.168.1.101,255.255.255.0 (contains internet service))

router 2 is left with a few free ports open in which connections can be made on the inside subnet, and will grab an ip in the 192.168.2.0 range

machine 1, the host
NIC0-usb cellphone adapter, (shares to NIC1)
NIC1-ICS sharing (connects to Router 1 WAN input)
NIC2-private access (connects to router 1)


machine 2, hardwired client
NIC1 - hardwired into Router2 - (gets ip lease of 192.168.1.x)

machine 3, wireless or laptop client
WLS1 - wireless to Router2 - (gets ip lease of 192.168.2.x)

what just happened?

i didnt think i would be able to use DHCP on either, let alone both routers, this is probably because instead of patching the ISP through a router output port, its because ICS is going to WAN port therefore isolating the ISP network. I think this is better since now the router can handle the traffic, instead of pushing ICS to the limits with multiple connections to its DHCP and routing capabilities.

can someone eleborate on uses for this type of network, and what subnet is int eh back, and what subnet is most usable? and what subnet i should i be connecting the host machines private adapter to, for most security, or do i need to connect the host machine to the outer net (192.168.1.0) to keep in contact with the router?