Help setting VLANs on Netgear GS908E switch? Not receive an IP in the correct VLAN tagged IP range

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sentur wrote:

1. UDM is managing the IoT VLAN and all other VLANs for that matter.
   1. It’s doing Gateway / Router / VLAN tag and network management and DHCP for all VLANs.
   2. UDM (LAN Port 2) is connected to Negear switch (LAN Port 1)

1.  

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You must understand and know how your UDM is is configured providing the VLAN 1 and 20 on what becomes the trunk port for the GS908E. If you can connect a computer to this port, and you get DHCP from what is serving the VLAN 1, it's most likely not tagged. .

sentur wrote:

I think this is correct?

1. VLAN ID 1:
   1. Tagged → Ports 1, 2, 4, 6, 7, 8
   2. Exclude → Ports 3, 5
2. VLAN ID 20: IoT
   1. Tagged → Ports 3, 5
   2. Exclude → Ports 1, 2, 4, 6, 7, 8

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Why oh why you changed all 1..8 to be tagged? It's only the trunk where you carry multiple VLANs which is all tagged (or one VLAN runs untagged). 

1. VLAN ID 1:
   1. Tagged → Ports 1 .. under the assumption the VLAN 1 is delivered as tagged. This is the de-facto standard for trunk links carrying multiple VLANs. It could be also used untagged for VLAN 1 with the PVID set to 1. 
   2. Untagged as access ports → 2, 4, 6, 7, 8 with PVID set to 1
   3. Exclude → Ports 3, 5
2. VLAN ID 20: IoT
   1. Tagged → Ports 1 ... this will be your uplink carrying the trunk of VLAN 1 and VLAN 20?
   2. Untagged → Ports 3, 5 with PVID set to 20 ... 
   3. Exclude → Ports 1, 2, 4, 6, 7, 8

In general, I tent to suggest some "logical" port organization. Port 1 VLAN Trunk uplink, port 2...6 access ports for standard LAN 1, port 7, 8 access ports for IoT.

sentur wrote:

What’s the difference between Untagged and Excluded?

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Excluded means the port is not participating in that VLAN.

Untagged means the frames leaving the switch on this post are untagged -and- the PVID defines the VLAN incoming untagged frames are assigned to.