If your network truly uses the 173.201.x.x/ 16 subnet, then your situation is going to be complicated by the fact that the address space on this LAN is the same as an existing address space on the internet. You should use one of the private address spaces as outlined in RFC 1918 (see section 3). The wireless access point does have a private network address as shown in your posting. Either you need to assign a 192.168.1.x/24 network address to the server and clients or renumber your network to one of the private address spaces and make the router the default gateway on the clients. The reason things are working right now is that the machines are all on the same subnet and they do not have to go to a routing device to talk to each other.
For your reference, the private address spaces per RFC 1918 are:
10.0.0.0 – 10.255.255.255 (10/8 prefix)
172.16.0.0 – 172.31.255.255 (172.16/12 prefix)
192.168.0.0 – 192.168.255.255 (192.168/16 prefix)