Hi.
Something similar happened to me lately.
I literally installed miles of network cable and hundreds of routers and switches, but well, you will never be perfect...
Some weeks ago, I had a small network gaming party (just 6 players) at home. After the party, my DSL connection still worked, but only on the PPPOE host/firewall itself, not on any other computer on the net. In fact, all my computers could see each other, but none could reach the firewall. It took me hours of wading through the firewall config, system logs and other things, I even checked all the cables twice. Then, after being ready to give up and finally having some breakfast (at 5pm, I stood up at 10am), I remembered that I had the switch for the gaming network connected to the firewall while playing, and suddenly remembered I had to put the long network cable (50 meters) into the uplink port of the switch, instead of the normal host ports, and after the games finished, I just put the original cable in that very same port. Well, after switching the original cable from the uplink port to a normal host port, my network miraculously
started working again.
cu,
sven