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Thanks for your helpful reply. I followed as best i could and still struggled. I then came across a forum post with someone having similar issues, his solution was to remove all the VLANS and try again.

I removed all the dhcp/interface and vlans from the config, set them up identically (copy and paste) one at a time and it's all working as expected now.

I'm not sure how, but somehow the config must have been corrupt the first time i set them

I have set up a couple of VLANS on my OPNSense instance, DMZ and WIFI.

I have created interfaces, and firewall rules to allow all traffic from the vlans to test connectivity (i want to communicate with a proxmox server on 192.168.1.x). I am able to ping and access the 192.168.1.12 server from the DMZ but unable to ping  it and no access from WIFI VLAN. The firewall rules show as green for both attempts in the live view.

I've compared setups and i can't see any differences between the DMZ vlan and the WIFI vlan at all other than ip addresses/ranges

To test i've setup two proxmox servers using vlan aware network, one on VLAN 10 (DMZ) and the other on VLAN20 (WIFI). DMZ can ping 192.168.1.12 and WIFI cannot. DHCP works correctly on both servers and they get the correct ip addresses assigned. If i switch VLANs between the two servers it remains consistant that VLAN10 can ping, but 20 cannot.

I was wondering if anyone had any pearls of wisdom that could help me figure this out?

Thanks,
Michael