Business Community > Omada > UDP Server traffic via VLAN not possible
< Omada

UDP Server traffic via VLAN not possible

12

UDP Server traffic via VLAN not possible

UDP Server traffic via VLAN not possible
UDP Server traffic via VLAN not possible
2026-03-26 07:45:54

Hi Omada world :)

 

I have an issue discovered that my clients (wireless tablets) can not connect to a running Docker container (minecraft server) - once they are moved into a separated VLAN.

 

PROBLEM:
- Minecraft Bedrock Server (marctv/minecraft-bedrock-server:latest) running perfectly on Synology DS923+ Docker (Port 21132 UDP/TCP)
- Wired clients (VLAN1) - can connect
- External via NAT - can connect
- Mobile iPhone/Android in VLAN30 (192.168.30.x) - can not connect via IP Adress and port "Multiplayer connection failed"

 

DIAGNOSIS:
- Ping NAS-IP (192.168.1.2) from VLAN30 → working
- Other Docker service Port 8123 (TCP) from VLAN30 → working

- If I connect instead from IP Adress with the FQDN and open the NAT in Omada its working
- therefore my conclusion is: UDP 21132 specifically blocked!

 

OMADA SETUP:
- ER605 Gateway, Omada Controller v6, EAP225/EAP653
- VLAN1: NAS/Server (192.168.1.2:21132)
- VLAN30: Mobile WLAN (30-Home WLAN)

 

I then tried to create Gateway ACLs.

one in each direction - but its also not working

 

I also added an mDNS config

as for the printer, becuase this solved my issue printing from iOS devices to my printer.

 

But as of Now, the client just receives this error after trying to connect.

 

Thanks for any help/advice/ideas on this. 

 

Best regards,

Mark

 

  0      
 
  0      
 
#1
Options
11 Reply
Re:UDP Server traffic via VLAN not possible
2026-03-27 07:58:33

Hi  @Compumark 

Thanks for your valuable feedback.

Please try to setup the SSID for EAP225 and test is the same issue would happen again or not.

By the way, what the firmware versions of your EAP225 and EAP653?

Best Regards! >> Omada EAP Firmware Trial Available Here << >> Get the Latest Omada SDN Controller Releases Here << *Try filtering posts on each forum by Label of [Early Access]*
  0  
  0  
#2
Options
Re:UDP Server traffic via VLAN not possible
2026-03-27 10:08:24 - last edited 2026-03-27 10:45:19

  @Hank21 

What do you mean with please try to setup the SSID for EAP225 and test is the same issue would happen again or not.

SSIDs are up and running a longer time already and are applied to the EAP225 devices (5 devices) and EAP653 1 device and EAP225Outdoor - 1 device

Here are the screenshots of the used SSID setup.

 

 

 

Firmwares are as follows:

EAP225 with 1.3.1

EAP653 with 1.3.5

ER605 with 2.3.2

Omada Controller 6.1.0.19

 

added the topology as well

 

  0  
  0  
#3
Options
Re:UDP Server traffic via VLAN not possible
3 weeks ago

Hi  @Compumark 

You can go to Devices>Manage Device>Config>Wireless to enable a single SSID for your EAP225 and connect the clients to EAP225 only to test if the same issue would happen or not. 

This is used to locate if the issue lies in the individual EAP or all EAPs.

Best Regards! >> Omada EAP Firmware Trial Available Here << >> Get the Latest Omada SDN Controller Releases Here << *Try filtering posts on each forum by Label of [Early Access]*
  0  
  0  
#4
Options
Re:UDP Server traffic via VLAN not possible
3 weeks ago

  @Hank21 

 

I just disabled all WiFi, except one, on one EAP225.

 

 

only one client was connected:

 

But the error is still existing. No connection can be esatblished.

  0  
  0  
#5
Options
Re:UDP Server traffic via VLAN not possible
3 weeks ago

  @Compumark If you create a new SSID that is set to connect to VLAN 1, and try connecting to the server from that newly created SSID, do you get the same error? 

If no, it might be an issue with your settings on VLAN30, otherwise, we might need to look a little deeper into your configs. 

Check out our subreddit, r/Omada_Networks! Want to help test and give feedback on new products? Sign up for the US Enterprise Beta Program here! Need a ticket? Contact Technical Support
  0  
  0  
#6
Options
Re:UDP Server traffic via VLAN not possible
3 weeks ago

  @NeilR_M 

 

Hi,

 

I wanted to add the VLAN1 to the new SSID - but VLAN 1 is not allowed by Omada.

 

I entered then my VLAN10

and its working to connect with a client

 

switched to VLAN30 its not

 

So I started checking the VLAN Config between 10 and 30.

 

VLAN10 config:

 

 

 

VLAN30:

 

 

 

I can not find any difference in this config.

  0  
  0  
#7
Options
Re:UDP Server traffic via VLAN not possible
3 weeks ago

  @Compumark 

 

UDP data can be very tricky to cross vlan boundaries, and for some services it isnt possible.  Can you switch the server to TCP mode ?

  0  
  0  
#8
Options
Re:UDP Server traffic via VLAN not possible
3 weeks ago

  @GRL 

I just checked, I didnt found a possibility to switch. 

But as the VLAN10 is working, but no other it must be there in some config/data routing.

  0  
  0  
#9
Options
Re:UDP Server traffic via VLAN not possible
Sunday

@Hank21  @NeilR_M 

 

do you have any news /updates/ideas what to further try?

 

Thanks a lot,

Mark

  0  
  0  
#10
Options
Re:UDP Server traffic via VLAN not possible
Monday

  @Compumark What ACL rules do you have that affect VLAN 10? Can you check those, and then maybe also consider adding equivalent gateway rules for VLAN 30 that allow TCP traffic as well? 

Check out our subreddit, r/Omada_Networks! Want to help test and give feedback on new products? Sign up for the US Enterprise Beta Program here! Need a ticket? Contact Technical Support
  0  
  0  
#11
Options
12

Information

Helpful: 0

Views: 748

Replies: 11

About Us
Press
Copyright © TP-Link Systems Inc. All rights reserved.