Hi  @ProSumerTester 

Thanks for posting here. we don't need extra ACL config to allow communication between different VLAN interfaces.

To understand the situation, please let us know the following info:

1. A screenshot of the VLAN config page;

2. Some screenshots of the Ping results;

3. Does this only happens on the IOT machine? If plug another client into the IOT VLAN, will the same thing happen?

4. Is the Internet access working correctly for the IOT VLAN?

  @Vincent-TP 
Hello 
Here are more details

There are no other machines on this vlan, just this one PC and bunch of IOT sensors that are communicating using wifi IOT.
Internet is working as I am runnning proxmox machine with mutiple virtual machines on it and all have access to internet.

  @GRL 
I have my devices on IP 172.16.172.x vlan 10 which need to access server/s on IOT vlan 30 with IP 172.16.174.x (ACL rule 7)

Hi  @ProSumerTester 

What kind of IOT machine is it? 

Do you have another client device for testing? For example, try connecting your phone to the IoT network to see if the same issue occurs.

Additionally, as I mentioned, different VLAN interfaces can communicate with each other by default. I recommend temporarily disabling the relevant ACL to test.

  @Vincent-TP 
There is nothing special with this machine, its normal hp mini pc running proxmox.
I can use and access IOT wifi with my phone but as I said I can not access from my laptop connected to wifi home (Vlan 10) to wired hp mini pc on vlan 30.