Hey guys, I just have a question, I have been troubleshooting this for a while but it's not making any sense to me.

My SMB shares were working just fine for years until last week, I noticed that I can't do file transfers. I can browse the shares but once I start a file transfer, it freezes File Explorer. I also tried to mount the same SMB shares in Linux with Dolphin and it crashes Dolphin too. I know it's not firewall related because I can browse into it and my VLAN computers can ping Unraid and vice versa. But then I tried to run iperf and found this:
iperf3 -c 192.168.0.204
Connecting to host 192.168.0.204, port 5201
[ ID] Interval Transfer Bitrate Retr Cwnd
[ 5] local 192.168.30.23 port 39468 connected to 192.168.0.204 port 5201
[ 5] 0.00-1.00 sec 384 KBytes3.14 Mbits/sec 2 1.41 KBytes
[ 5] 1.00-2.00 sec 0.00 Bytes 0.00 bits/sec 1 1.41 KBytes
[ 5] 2.00-3.00 sec 0.00 Bytes 0.00 bits/sec 0 1.41 KBytes

There is traffic and then it drops right away. Which I think makes sense, I can browse then File Explorer hangs up. When I do reverse:
iperf3 -c 192.168.0.204 -R
[ ID] Interval Transfer Bitrate
[ 5] local 192.168.30.23 port 33236 connected to 192.168.0.204 port 5201
[ 5] 0.00-1.00 sec 112 MBytes 941 Mbits/sec
[ 5] 1.00-2.00 sec 112 MBytes 941 Mbits/sec
[ 5] 2.00-3.00 sec 112 MBytes 942 Mbits/sec

It works just fine. Now I tried to change my end point. I created a new VLAN that basically can flow my entire network and it worked. So basically, I've isolated my issue to just the 192.168.0.x VLAN/subnet. But I don't get why, I don't think it's firewall related because I never changed any rules in the past week and the fact that ICMP works both ways. I checked MTU along the path and ensured jumbo frames are disabled.

Any ideas?

Edit: Thanks folks in advance

Edited February 2Feb 2 by WhiteFrost
Thank you in advance

Does it work without VLANs? Also, please post the diagnostics.

19 hours ago, JorgeB said:

Does it work without VLANs? Also, please post the diagnostics.

Yes it does work if I connect my computer to WiFi on the same VLAN/subnet of the share. I've dropped 2 txt files here. The ZIP is from UNRAID while the .txt is the stripped version I only included the last half hour to not waste a ton of time for you in case you don't need old logs. I ran iperf while I am connected to my "problem" VLAN and while I am connected to the same VLAN as UNRAID within 10 minutes of writing, so it should be in the logs. But I don't see it myself in the logs so I don't think it captured it.

Thank you again.

Syslog.txtUNRAID-syslog-20260204-0321.zip

If it works without the VLAN it suggests a config issue, if you really want to use one, my recommendation would be to post the full diagnostics and identify the problem VLAN. ChatGPT may also be a good help to troubleshoot this kind of issue.

Yeah, it's in my previous post, the ZIP file is the diagnostic from Unraid. I have created a new syslog zip file from Unraid, posted here. I did an iperf and file transfer attempt for this log.UNRAID-syslog-20260205-0347.zip

I'd like to make some corrections on my previous statement. It doesn't look it is affecting just a single VLAN. The problem happens whenever I do interVLAN connection, only affecting file transfer and I notice it in iperf as well. But if my end point was in the same subnet as Unraid, it works just fine. I know it's not a firewall issue though because browsing and accessing dockers from that subnet works fine.