Ping-Destination Host unreachable?

To put it simply, I'm just trying to successfully ping machines attached to a hub for now. Here is the setup:

5 Port ethernet Hub
Computer connected to port 1
Linux machine connected to port 2
Linux machine connected to port 3

Both linux machines have (different) static IP addresses. None of this is connected to any outside network, internet, etc. I don't know what I'm doing wrong with this setup because I can't successfully ping the Linux machines from my computer and I'm not sure what the issue is.

 

Are the assigned ip address to each machine on the same subnet?

for example if I set the following ip addresses

1 - 192.168.1.1 with a subnet of 255.255.255.0
2 - 192.168.1.2 with a subnet of 255.255.255.0
3 - 192.168.1.3 with a subnet of 255.255.255.0

so each computer is on the 192.168.1 network.
In this example each computer would be able to ping each other.

if each computer was configured on different networks like the following:

1 - 192.168.1.1 with a subnet of 255.255.255.0
2 - 192.168.2.1 with a subnet of 255.255.255.0
3 - 192.168.3.1 with a subnet of 255.255.255.0

In this case each computer is on a different network 192.168.1, 192.168.2, and 192.168.3, so in this example the only way for those computers to talk to each other is if a router was in place on each network. Without a router you would get network unreachable or something to that effect.

 

Can the linux machines ping each other?

Does the computer have a static ip?

Can you say what the ip settings of all 3 machines are? That might make it faster.
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Note: from personal experience, I HIGHLY recommend that you not use a super common ip scheme like 192.168.1.X. Right now you can chose anything in the LAN ip world so chose something a little less common. 192.168.78.X is nice. 10.0.78.X is an easy one. The problem comes when there is future growth to your little group. You plug in a printer server to have a networked printer and the default conflicts with your scheme and it's just not worth it (just one example of many that have haunted me). Go obscure, I highly recommend the path less traveled.