On 23/02/17 08:27, Rommel Rodriguez Toirac wrote: > The solution was another IP address to this network device and then > everything work fine. > Why this happend? How I can erase the link beteewn MAC 00:1D:09:FF:44:4B and IP 192.168.41.4? Where can be stored this link? > Right now in the network is not assignet the IP address 192.168.41.4 to no one device (printserver, switch, router, workstation or server) and still whe I make arping have the answer: > > rommel at p6:~$ arping 192.168.41.4 > ARPING 192.168.41.4 from 192.168.41.6 enp3s0 > Unicast reply from 192.168.41.4 [00:1D:09:FF:44:4B] 0.631ms > Unicast reply from 192.168.41.4 [00:1D:09:FF:44:4B] 0.623ms > Unicast reply from 192.168.41.4 [00:1D:09:FF:44:4B] 0.623ms > Unicast reply from 192.168.41.4 [00:1D:09:FF:44:4B] 0.691ms > ^CSent 4 probes (1 broadcast(s)) > Received 4 response(s) One thing to try if you have access to the switch where all the devices are plugged in: *$ sudo ping -f 192.168.41.4* Then watch the switch for a lot of activity on 2 ports - the one you are plugged into and another. The other busy port will be the one that's causing you grief. If you have daisy chained switches, then it might take a little longer to track it down. Happy hunting - :).