pfsense not able to pick up DHCP broadcasts from proxmox guest tagged with VLAN

[crissaegrim]

TLDR: No DHCP offers from pfsense with VLAN tagged on a VLAN-aware host. Switch is trunked to allow "All" traffic.​

I have a VLAN tagged as 20: https://i.imgur.com/Rz61DMz.png
And its corresponding interface: https://i.imgur.com/pQxJitG.png
And its DHCP server: https://i.imgur.com/jsAjxid.png

I start packet capture to see if DHCP on this VLAN responds: https://i.imgur.com/xlfsm4U.png at Diagnostics -> Packet Capture -> VLAN20 (vmx1.20) (I don't see any activity, zilch).

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On proxmox side, I have this guest: https://i.imgur.com/md46zBT.png
Its host has bridge-vlan-aware yes: https://i.imgur.com/72iiWmW.png also the GUI: https://i.imgur.com/L2WBcgo.png

I start data capture on the host to see if DHCP for VLAN 20 is being solicited (it is): https://i.imgur.com/HMdpzqi.png
The guest is timing out, with no DHCP offers: https://i.imgur.com/Yyul1iA.png

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Then finally, on the switch's port, I double-checked that it's allowing All: https://i.imgur.com/iTnIzH2.png

 

[crissaegrim]

Figured it out. Two issues: I was missing an additional setting in `/etc/network/interfaces`:

bridge-vlan-aware yes
bridge-vids 2-4094

Then on `pfsense`, I had to change the network cidr from `/16` to a smaller one like `/24` or `/23`. My guess is pfsense CE doesn't support huge networks like `/16`.