Alpine Hosts

hostname pc-20
ip link set dev eth0 up
ip address add 10.0.20.20/24 dev eth0
ip route add default via 10.0.20.1

iperf

Server iperf --port 2000 --server

Client iperf --port 2000 --client 10.0.0.1 --num 10k --reverse --udp

... seems to work fine!

If you have enterprise CML, there is a front network and a back network.

The back network uses ipv6 link-local addresses which do not play well with Proxmox port channels and vlan tags.

It seems much safer to have a dedicated port for the back network.