I am expecting a home network to also have 192.168.
Seriously, there has to be something like what might happen in dec 2012, for someone to not able to connect two machines together, whether through wireless home network or through cables. If it's a router issue, then this can be fixed cos it's at your home and you are the master. If it's something offered by ISP, then only your ISP can fix.
The tut in my sig (the one in red), is abc stuff...if you are not using wires, the principle is still the same.
Here we just want to get to machines to talk to one another, steps 1-6.