in fact I made a mistake:
ping from 192.168.1.105 for 192.168.1.103 not working ping from 192.168.1.105 for 192.168.1.102 not working ping from 192.168.1.102 for 192.168.1.103 not working
but ping from 192.168.1.101 for 192.168.1.103 working and ping from 192.168.1.101 for 192.168.1.102 working
192.168.1.101 is another that is not involved on the traceroute to reach 00:15:6d:a3:15:2e (192.168.1.103)
traceroute to 00:15:6d:a3:15:2e (00:15:6d:a3:15:2e), 50 hops max, 20 byte packets
1: 00:15:6d:ad:d3:2b 0.563 ms 1.045 ms 1.115 ms 2: 00:15:6d:a3:15:2e 2.522 ms 2.142 ms 2.153 ms