VLANS and SwOS are not my usual territory so apologies if this seems a simple (or stupid!) question.
My PFSense gateway is failing to pick up a DHCP response when directly connected to a fibre ONT. The ISP have confirmed that it should be working, no MAC whitelisting needed.
On further investigation, they are using 802.1ad/QinQ with the service tag of vlan911. The inner customer tag is vlan0. PFSense (more specifically the version of FreeBSD they use) throws a wobbly over the use of vlan0 resulting in packets getting dropped and no DHCP response being received. This will eventually be fixed when they move to a newer version of FreeBSD but that could be some time.
One recommendation is to try using a switch between the ONT and PFSense to remove the vlan0 tag.
I have a CSS326-24G-2S+RM (running SwOS 2.13) with some spare ports that is conveniently right next to my PFSense gateway and the ONT.
I plan to use port isolation to create essentially a two-port switch just for this purpose. What I need to achieve is to have the vlan0 removed from the incoming packets. I guess this would be converting the 802.1ad/QinQ (with vlan911 and vlan0) to just an 802.1Q (with vlan 911), which matches what I have on the PFSense WAN connection.
Is this possible within SwOS or am I going about this completely the wrong way? I see the option to force a vlan id but I'm not clear how that would effect the 802.1ad packets?