Are you the only machine on the network?
Could it be that your router connects you to the Internet etc, but not to the LAN? In that case it's a question of either / and
a) setting up a network in Windows to see the other machines
b) looking at the router (192.168.2.1) LAN setup page to make sure that the thing is set up as a DHCP server and covers a reasonable range of addresses so that it sees everyone & gives them an address.
OTOH, if you are the only one, you don't need to connect to the network, do you? Only to the wide world - and you seem to be doing that, yes?
Jim