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Here is the working net-namespace configuration, and the lines to delete once done:

# Node 5 root
ip netns list
# Working NetNS config:
ip netns add iperf-server
ip netns add iperf-client
ip link set ens801f1 netns iperf-server
ip link set ens801f0 netns iperf-client
ip netns exec iperf-server ip link set dev lo up
ip netns exec iperf-client ip link set dev lo up
ip netns exec iperf-server ip addr add dev ens801f1 10.10.122.25/24
ip netns exec iperf-client ip addr add dev ens801f0 10.10.124.25/24
ip netns exec iperf-client ip link set dev ens801f0 up
ip netns exec iperf-server ip link set dev ens801f1 up
ip netns exec iperf-server route add default gw 10.10.122.25
ip netns exec iperf-client route add default gw 10.10.124.25

# Delete

ip netns delete iperf-server
ip netns delete iperf-client

Initial results for tests with this configuration (using the iPerf 2 tool) indicate that UDP testing is a more reliable assessment of the calibrated bit rate (after correcting for ETH, IP, and UDP header overhead, the values reported below are for protocol payloads of a single UDP stream or 3 TCP connections).

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