You need to look at the addresses of all 3. the 192.168.240.2 is a bit unusual - usually, you will see something more along the lines of 192.168.2.2 or something (although the 240 is legal). Assuming the subnet mask is 255.255.255.0, then all three devices need to be 192.168.240.??? for them to be able to communicate with each other. The subnet mask tells you which part of the address is the network and which part is the hostID. the "255" chunks are network while the "0" is the hostID - in the case of the usual 255.255.255.0, only the last octet can change and still be part of the 192.168.240. network. Not sure how much of this you are familiar with, but that is how it works and without DNS to resolve the name, you have to use the IP addresses to talk between devices.