ODuis

Like outlined above, the flanky speed issue with the router was just one. Also problematic were the seemingly sporadically dead ports on the other devices. But anyway, solved with these settings.

Thanks for asking, Adam. Yes, switching off both Flow Control and port based QoS made it rock stable. I could try to switch on Flow Control since by itself it did not seem to make the difference, but I don't dare touching it since it works so nicely now. Since the gigabit switch has enough headroom for the 100mbit internet…

Thanks Adam, that was my first suspect, too. But it switching it off alone did not help it seemed. My next suspect is the port based priority (gave more priority to the router an the laptops, less to the printers), so I'll try to enable IGMP Snooping to see it that is ok. Might be a weired issue in feature combination, or…

I switched off flow control, IGMP snooping and port based QoS. Now it's a pretty plain switch, but it seems to be stable.

Its not a cable problem, like I said, it had trouble with several devices connected through different cables. The router connection was just one of the problems. However I found that switching off all advanced features on the Zyxel seem to have solved the problem.

I tested the ping with switch and 25m as well as with directly 25m with PC. No packages loss. Ping times just a few ms. I'll try to disabled some advanced switch features. It should be unrelated, but I heared that some switches are a bit buggy, so stripping advanced features sometimes works miracles on some models.

Hello Peter, Yes, an ISP router from german telecom (Speedport Smart 3). Distributed as plain but reliable workhorse. Pings from the PCs to the central router as well as to e.g. the printer connected to the switch are very fast and have 0% loss rate. Internet works fine. Just sporadic instabilities as described above. PS:…