VLAN can't get an IP address from DHCP

Started by efirhino, November 15, 2025, 12:30:54 PM

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I have 2 seperate firewalls running on opnsense with identical hardware. One has no problems assigning additional VLAN's for IOTDevices and Guest Network. The other firewall is connected to internet via PPPOE and vlan 201. When I create a VLAN for the guest network all devices fail to connect reporting failed to get ip address. The 2 firewall VLAN's are configured exactly the same and running the same hardware. The only difference is the PPPOE using VLAN 201 to connect to the internet.
Everything works perfectly on the non PPPOE setup.  Any help would be appreciated
Intel N150, 2* I226-V, 12 GB, 512 GB

For the first LAN, there is a default "allow any" firewall rule. Depending on how / when you created the VLAN on your machine, that will not have this rule per default, if you have not replicated it.
Intel N100, 4* I226-V, 2* 82559, 16 GByte, 500 GByte NVME, ZTE F6005

1100 down / 800 up, Bufferbloat A+

Thanks for the reply  - Allow Any rule is active for the additional VLANS.  I have created 3 VLANS and they all have the same issue.
Intel N150, 2* I226-V, 12 GB, 512 GB

November 15, 2025, 01:23:17 PM #3 Last Edit: November 15, 2025, 04:00:53 PM by meyergru
What exactly does not work? Do the clients receive IP adresses via DHCP? Do they receive a default gateway? Can you ping the gateway? Where does a traceroute 8.8.8.8 end?
Intel N100, 4* I226-V, 2* 82559, 16 GByte, 500 GByte NVME, ZTE F6005

1100 down / 800 up, Bufferbloat A+

November 15, 2025, 03:24:37 PM #4 Last Edit: November 15, 2025, 03:50:17 PM by efirhino
Clients do not receive an IP address from the VLAN's DHCP server.  Clients don't get the default gateway either.  From a local machine I can ping the VLAN's gateway
and the tracert fails with transmit error because the client does not have an IP address.
thanks for your time...
Intel N150, 2* I226-V, 12 GB, 512 GB

Is any of the various DHCP services configured and enabled for these VLANs?
Deciso DEC750
People who think they know everything are a great annoyance to those of us who do. (Isaac Asimov)

What about you show us your Rule & DHCP config foe those VLANs?

Regards,
S.
Networking is love. You may hate it, but in the end, you always come back to it.

OPNSense HW
APU2D2 - deceased
N5105 - i226-V | Patriot 2x8G 3200 DDR4 | L 790 512G - VM HA(SOON)
N100   - i226-V | Crucial 16G  4800 DDR5 | S 980 500G - PROD

Today at 02:23:25 PM #7 Last Edit: Today at 02:25:37 PM by efirhino
DHCP Services configured and enabled.   Here is the VLAN config for IOTDevices.  Also, the VLAN for my internet connection.  Thanks
Intel N150, 2* I226-V, 12 GB, 512 GB