For a switch/hub or other network device you generally use a straight (non-crossover cable) - for direct device to device connection you will (in most) cases need a crossover-cable.

1. Some (not all) switches have "auto-sensing" ports that apply crossover or not depending on the cable you use - check the actual specifications of your switch.
2. Common issue is that individual ports in a switch might be "fried", hence maybe the port you have connected A into may be dead - try another port.

..
Mike

On 3/29/16 2:35 PM, joe mwirigi via skunkworks wrote:
To network techies,

I've been experiencing a problem which I cannot figure out the cause. I have a device(A) connecting to a switch (S) then a router. If I connect the device directly from a laptop(B), am able to reach the device. 

A to B = works

if I connect A to the switch and B to the switch 
A to B through S = Not reachable

If I introduce another computer(C) and assign it a similar IP(that of device A) 
C to B through S = works.

Device A has no firewall the subnet is the same for all the devices (255.255.255.0) so is the IPs (192.168.0.*).

At first I thought the subject was the problem but C connects to B thro the same setup. or is the device ginxed for real.


Help
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