Its data sheet says it's managed. It looks unmanaged, but I had a managed switch that was pre-set to use one port as uplink, and if you tried to do anything different, badness. I'm guessing there's a way to set it up that'll get you running.
this post was submitted on 22 Aug 2023
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I actually had to double check the switch, turns out i do have the SG105 not the SG105E. SG105E is managed, i have unmanaged. edit the post accordingly
Hmm the TL-SG105E is definitely a managed switch according to TP-Links website, maybe it has existing config on it?
Yes TL-SG105E is unmanaged. I went back and checked i just have TL-SG105
If it's a 5 port TP link switch, it's important to start it up connected to the upstream router on the first port.
If it does not receive DHCP info (being assigned an IP by your router) when starting up, it will perform DHCP itself, which will cause chaos if your main router is trying to do the same.
That would explain this chaos. But how do resolve it? Resetting the router, then both switches does not seem to improve things.
Start with layer 1. Are link lights on the NICs and switch ports on? Moving cables around, is there an issue with some ports and not others?
Yep All lights on the nics and switch ports are on. And as i mentioned in the post i swapped all the cables and double checked each of the ports. The cables seem to work just fine on the personal PC and swapped between all of the ports. Still unable to talk to the servers.
I used to have one TL-SG105 and I solved this problem by connecting port 1 to the upstream router on first boot, so it can get an IP assigned by the router's DHCP server and not create it's own, breaking your entire network.
Not sure if this was resolved or not, but did you check for static IPs on devices? I ran into an issue when setting up the SG108E where even though I had Linux set to DHCP, it was assigning the manual entry. Rookie mistake 😞. Once I cleared the manual entries and cleared the static IPs from DHCP leases it cleared.
I would start with the minimal setup. Connect one of the non working machines to just the the switch, just to rule out any other equipment. Test all ports with this PC. repeat with the other two. Where are the similarities? Is something different?
Also, the TL-SG105E is a managed switch. Connect it to the working PC and open the web interface. Default IP of the switch is 192.168.0.1 if there is no DHCP lease. Make sure the IP is not used twice in your setup. Make a fimrware update, make a factory reset on the switch.
I actually had to double check the switch, turns out i do have the SG105 not the SG105E. SG105E is managed, i have unmanaged.
Alright, that makes it a bit easier. Any luck so far in debugging the problem?