Reply 20 of 24, by calvin
ICS should be creating a subnet behind NAT out of the box, so unless you bridged the networks somehow, something smells very rotten.
I personally would just set up the old machines on an isolated network without direct internet access, with your main machine connected to both networks. (main and dark, and set up the dark one was private and the main as public) Windows 9x and friends don't really want to see the modern internet, and you can store stuff on the main machine to share with the dark one. if you must have internet, set up forwarding and use your machine as a gateway.
2xP2 450, 512 MB SDR, GeForce DDR, Asus P2B-D, Windows 2000
P3 866, 512 MB RDRAM, Radeon X1650, Dell Dimension XPS B866, Windows 7
M2 @ 250 MHz, 64 MB SDE, SiS5598, Compaq Presario 2286, Windows 98