We have a router supplied by an external co. with 2 IP ranges on it. The main network of 4 or so switches is connected to each router ports via cat5 from switch1.
Have setup a computer with static IP in range to test.
Plug the computer directly into the router with a crossover cable and it replies to PING all day from both ports.
Plug the computer directly into ANY of the 4 switches with a cat5 cable, and one range replies to PING fine, the other range replies erratically, often ‘request timed out’ (changing IP of computer before of course).
My switches are obviously the culprit, they are all Dlink GB 1224T which have a management IP of 192.x.x.x. They have spanning tree protocol setup on them. There’s no firewall onsite.
What would cause this erratic reply behaviour?