Issue with Linux VM's connecting over Br0 with bonded NIC

[Poprin]

I have recently purchased a new router with the ability to bond 2x ethernet ports. So I have configured my server to bond the two 2.5gb NIC's using the 'balance-rr' setting which I believe is round robin. Now this has worked great in Unraid itself and all dockers are behaving as normal. However my Virtual Machines are not. Ironically my Windows VM, after starting up and renaming the network interface did just work. But I have been experimenting with Linux and my Arch, Fedora and Ubuntu VM's all will not connect using Br0. If I change the config to use virbr0 they will connect but obviously this only gives them external access and won't allow me to RDP to them or access them from my wider network.

 

Can anyone shed any light on why this may be? All the VM's are configured the same. Br0 network source and virtio as the network model. Windows works, anything Linux does not (it all worked fine before I bonded the NIC's).

[Poprin]

Bit of a shameless Saturday daytime bump. Anyone have any ideas? My usual google fu' is failing me on this one. Clearly I'm missing something key as all 3 linux distro's don't work and Windows does.

[Poprin]

Still trying to fix this and googling the problem has brought me back to my own post! I've modified my bonded NIC config to 802.3ad as I realised this should have been the way it was configured looking at my Asus XT9 documentation. Was hoping this had cracked it but unfortunately still experiencing the same issue. Windows works, all Linux VM's do not work.