Ok, yikes, this can get pretty messy.. but here goes...First, ICS (oe Internet Connection Sharing) requires sets you 2nd NIC to a default 192.168.0.1 address, this can not be changed for ICS to function.So with that in mind , you are going to have to play around the 2nd NIC (network card) to get this up and running.First you have to setup the router from being plugged in one of the access ports to login to router to make your settings. (hmm.. lets try to put this as simple as possible)Main machine must have 2 NIC (network cards)IF your Wifi card is getting from your neighbor, I assume 192.168.1.1 which is the gateway, means you should have somehting like 192.168.1.5 or something as you IP.Your wired NIC should go to your router.. DO not setup sharing on the WIFI card just yet..Login to your router, make your settings somthing very broad in terms of IP setting...Hell drop it to something like 192.168.6.666 or something, keep it as far as you can from 192.168.0.1 or 192.168.1.1 as possible.make sure this is giving ip to the rest of your gear....Now comes the decision part.. you decide if you want to let the router use DHCP or not, if you, you are going to have speed and redundacy issues on anything connected to that router, as the once ICS is enabled, it is fact acting as a router with DCHP also..not to mention the DHCP turned on your neighbors router...messy messy messy...I would recommend that you turn off DHCP in your router as the last step of your router configuration, then reboot router..Now go back and turn on ICS (internet connection sharing) on your WIFI card... This will set your 2nd NIC to 192.168.0.1 and turn on the dhcp...From this moment, plug your wired 2nd card into the router, (now depending on your router model there is 2 ways you are going to have to try this)First try to plug into one of the numbered ports 1-2-3-4 etc and reboot, see if you can now access Internet passthrough through router..This should be getting up and running, if not then you may need to go an advanced setup using same setup but with a 10/100 hub added into the picture (not another router, must be hub)and that takes alot more setup and configuration...Just let me know if the firat way works..
