@stefano When I was still working at $weDropPackets, we had an intern who had never seen..... anything.We installed new service on a network, and, instead of looking at the existing network, he just dropped in a router on 192.168.0.1/24.Problem is, they had an AS/400 on that address, and their previous provider had used .254 as the gateway/dhcp server.It turns out, AS/400s do not handle ARP conflicts well, at all.Had to get the vendor on the horn, because I am not an IBM person. He was very nasty, "I don't understand why anyone did this, why did this happen?"Dude, we hired an 18 year old, and he was an idiot..... get over it and help me fix this shit.That was the day I learned that nearly all IBM mainframe commands begin with the letter W for some reason.