#!/bin/bash -x

if [[ $1 ]]; then
    sudo ip link del eth1
    sudo ip link del eth2
    sudo nmcli c delete eth1 eth2
    sudo ip netns del tmp
    exit
fi

sudo ip netns add tmp
sudo ip link add eth1 type veth peer name eth1peer
sudo ip link add eth2 type veth peer name eth2peer
sudo ip link set eth1 up
sudo ip link set eth2 up
sudo ip link set eth1peer netns tmp
sudo ip link set eth2peer netns tmp
sudo ip netns exec tmp ip link set eth1peer up
sudo ip netns exec tmp ip link set eth2peer up

sudo nmcli device set eth1 managed yes
sudo nmcli device set eth2 managed yes