Hello! Before I posted this I did a search to see if someone else ran into it, and couldn't find one, so here we go.

My setup: 3 Node Proxmox Cluster. Each Node has 2 NICs (2.5gb and 10gb). 2.5 back to the main network, and 10gb directly to my TrueNAS server where the storage resides.
My TrueNAS server has 4 NICs, a single Management port, and three 10gb connections.
(10.10.11.x, 10.10.12.x, and 10.10.13.x)

Each Proxmox Node connects directly to TrueNAS over the 10GB link. No Switch in between.
I, for reasons beyond me, setup iSCSI connections over the Management port (facepalm) and wondered why my VM's were being slow.

Here is the problem:
If I try to connect over the 10GB line, it works as long as I point the specific node to the specific IP of the NAS attached to it. But this means HA is broken.

What I've tried:
Made the Linux Bridge on each of the nodes VLAN Aware.

Results:
Mixed bag. Node 1 can see its connection Plus .13, but not 12. Node 2 can see itself and .11 but not .13, and Node 3 can only see itself.

Goal is to have each node be able to see each of the other network addresses. Maybe its something in TrueNAS I need to enable, or its Proxmox, not sure.
Thanks for whatever direction this awesome community can provide!