Cplease try to set the IP address manually in your pc to test like this:
arp -s 192.168.1.2 xx-xx-xx-xx-xx-xx where xx is the MAC number of the device
arp -s 192.168.1.12 xx-xx-xx-xx-xx-xx where xx is the MAC number of the device
arp -s 192.168.1.11 xx-xx-xx-xx-xx-xx where xx is the MAC number of the device
and try to ping .
what is your PC OS ?