Two RE550 connected to a switch: network freeze after one of the PCs shut down! Help!!
Hello guys,
I have the following configuration and situation that is driving me crazy and I need someone help! Here is the situation.
I have a network with two RE550 connected to an SG-1016D (HW V. 12) unmanaged switch with ethernet cables (the RE550 are both set as AP and not as range extenders). The network is brand new: the cabling has been completed a few months ago, all tested, and the hardware (switch and APs) is brand new as well.
When one PC on the network goes down (I switch off the pc or simply I pull out the ethernet cable from the ethernet port of the PC), the network suddenly freeze, and I can't ping anything nor reaching any website. If the PC turns on again (or I connect again the cable in the ethernet port), the network start again to work perfectly.
I started to make some HW failure check: I've connected both RE550 to another SG-1016D with a different hw version (HW V. 7.1) and I have no problem. Additionaly, I've tried with another switch model, a Netgear Prosafe GS108PE, and everything works fine. I though there was some hw failure in the switch, and I've ask for a replacement of the switch with a brand new SG-1016D (HW V. 12): damn! The problem has come up yet again!
At this point, I thought there was some hw (chip) conflict between the RE550 and the SG-1016D V.12, and I bought a totally different switch - a Zyxel GS1900-24E smart managed switch - and...the issue has come up again!!!!! :'(
I can't figure out what it could be or what is wrong with the configuration. If someone has any idea I'd really appreciate it. Thanks
Hello @Joseph-TP . Thanks for your reply. Below an image that reports exatly the network topology.
The Router/modem has been provided by the ISP. Actually I've done one more test (I forgot to mention it): I've interposed an old TPLink Router between the SWITCH and the ISP Modem router in order to let the interposed router manage the DHCP, but it doesn't resolved the issue. I've not tested to connect all the RE550 to the ISP Router, I'll try.
The only test that solves the issue is to replace, in the above scheme, the TP-LINK SG1016D V12 with another TP-LINK SG1016D (hw V7.1) or with a Netgear Switch Prosafe GS108PE V3, while with the Zyxel GS1900-24E (HW B version) the problem is still present.
About the error: the only thing that happens when I shutdown one of the wired PC, all the remaining PCs can't reach any website, and after a couple of minutes the windows network icon (the one on the taskbar on the right) reports "no internet connection".
If I leave opened a prompt window with the "ping 192.168.1.1 -t" command active on one or more PC over the network (192.168.1.1 IP address is the ISP Modem/router), before I disconnect the PC the ping goes fine and all the PCs reach perfecly the modem, but when I shutdown one of the PCs (or I pull out the ethernet cable from the ethernet port of the PC) the ping on the other PCs fail, until I reconnect the disconnected PC to the switch, then the newtork works fine again, all the PC reach again all the websites and the ping goes fine as well on all the PCs.
Actually I've also tried to leave connected just one RE550 to the switch (I've tried with both the AP alternatively), and with this configuration, in the moment I disconnect one PC, the ping fails as well but just for e few seconds, then start again to ping the ISP router correctly.
At the beginning I've tried to contact by email the support to ask for a warranty replacement reporting the problem, but noone answered me. After that, Amazon let me obtain the refund and I send back the switch to amazon. At this point I've bought a brand new SG-1016D tplink (I've received the same HW version) and the problems was still present, so I've send back the switch, and now I don't have it anymore. I thought it was an HW conflict between this specific TP-LINK model and the RE550, so I've tried to change switch model and manufacured (I bought a Zyxel) without solving the problem but I can't figure out what is the conflict and how I can do to verify it.
Hi @Joseph-TP
Here follow some more test.
I've connected both the wifi devices to the ISP Router, and with this connection the problem doesn't come up, I've also tested the network with a new Switch model (NETGEAR GS324 unmanaged) by keeping the original topology of the image I've posted in my last post and the issue is again present.
I've also tryed to downgrade all the RE550 firmware with no results.
Here follow another test: as you can see by the ping status, once I disconnect one of the PCs, the network goes down. After I disconnect one RE550 AP, after a few seconts the network rise up again.
I'm definitively out of solution in this moment.