#working configuration
ip netns add h1
ip netns add h2

ovs-vsctl add-br s2

ip link add h1-eth0 type veth peer name s2-eth2
ip link add h2-eth0 type veth peer name s2-eth3

ovs-vsctl add-port s2 s2-eth2
ovs-vsctl add-port s2 s2-eth3

ip link set h1-eth0 netns h1
ip link set h2-eth0 netns h2

ovs-vsctl set-controller s2 tcp:127.0.0.1

controller ptcp: &

ip netns exec h1 ip addr add 10.0.0.1/8 dev h1-eth0
ip netns exec h2 ip addr add 10.0.0.2/8 dev h2-eth0

ip netns exec h1 ip link set h1-eth0 up
ip netns exec h2 ip link set h2-eth0 up

ip link set s2-eth2 up
ip link set s2-eth3 up

ip netns exec h1 ping -c1 10.0.0.2
ip netns exec h2 ping -c1 10.0.0.1

#remove all netns and stop all controllers
ip netns | xargs -I {} sudo ip netns delete {}
mn -c

# nonworking configuration

ip netns add h1
ip netns add h2
ip netns add sw2

ovs-vsctl add-br s2

ip link add h1-eth0 type veth peer name s2-eth2
ip link add h2-eth0 type veth peer name s2-eth3

ovs-vsctl add-port s2 s2-eth2
ovs-vsctl add-port s2 s2-eth3

ip link set h1-eth0 netns h1
ip link set h2-eth0 netns h2

ip link set s2-eth2 netns sw2
ip link set s2-eth3 netns sw2
ip link set s2 netns sw2

ip netns exec sw2 ovs-vsctl set-controller s2 tcp:127.0.0.1

ip netns exec sw2 controller ptcp: &

ip netns exec h1 ip addr add 10.0.0.1/8 dev h1-eth0
ip netns exec h2 ip addr add 10.0.0.2/8 dev h2-eth0

ip netns exec h1 ip link set h1-eth0 up
ip netns exec h2 ip link set h2-eth0 up

ip netns exec sw2 ip link set s2-eth2 up
ip netns exec sw2 ip link set s2-eth3 up

ip netns exec h1 ping -c1 10.0.0.2
ip netns exec h2 ping -c1 10.0.0.1