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$neutron router-list
$ip netns | grep your-router-id
$ip netns exec qrouter-your-router-id ip ip a
$ip netns exec qrouter-your-router-id ip ping -c 5 your-instance-floating-IP
$ip netns exec qrouter-your-router-id ifconfig
$ovs-vsctl show ( on Neutron Server)

$neutron router-list
$ip netns | grep your-router-id
$ip netns exec qrouter-your-router-id ip ip a
$ip netns exec qrouter-your-router-id ip ping -c 5 your-instance-floating-IP
$ip netns exec qrouter-your-router-id ifconfig
$ovs-vsctl show ( on Neutron Server)

$neutron router-list
$ip netns | grep your-router-id
$ip netns exec qrouter-your-router-id ip a
$ip netns exec qrouter-your-router-id ip ping -c 5 your-instance-floating-IP
$ip netns exec qrouter-your-router-id ifconfig
$ip netns exec qrouter-your-router-id iptables -S -n nat
$ovs-vsctl show ( on Neutron Server)

$neutron router-list
$ip netns | grep your-router-id
$ip netns exec qrouter-your-router-id ip a
$ip netns exec qrouter-your-router-id ip ping -c 5 your-instance-floating-IP
$ip netns exec qrouter-your-router-id ifconfig
$ip netns exec qrouter-your-router-id iptables -S -n -t nat
$ovs-vsctl show ( on Neutron Server)

$neutron router-list
$ip netns | grep your-router-id
$ip netns exec qrouter-your-router-id ip a
$ip netns exec qrouter-your-router-id ip ping -c 5 your-instance-floating-IP
$ip netns exec qrouter-your-router-id ifconfig
$ip netns exec qrouter-your-router-id iptables -S -t nat
$ip netns exec qrouter-your-router-id route -n
$ovs-vsctl show ( on Neutron Server)

$neutron router-list
$ip netns | grep your-router-id
$ip netns exec qrouter-your-router-id ip a
$ip netns exec qrouter-your-router-id ip ping -c 5 your-instance-floating-IP
$ip netns exec qrouter-your-router-id ifconfig
$ip netns exec qrouter-your-router-id iptables -S -t nat
$ip netns exec qrouter-your-router-id route -n
$ovs-vsctl show ( on Neutron Server)
$neutron agent-list ( on Neutron Server)

Here are some ideas for you to debug networking issues:

$neutron router-list
$ip netns | grep your-router-id
$ip netns exec qrouter-your-router-id ip a
$ip netns exec qrouter-your-router-id ip ping -c 5 your-instance-floating-IP
$ip netns exec qrouter-your-router-id ifconfig
$ip netns exec qrouter-your-router-id iptables -S -t nat
$ip netns exec qrouter-your-router-id route -n
$ovs-vsctl show ( on Neutron Server)
$neutron agent-list ( on Neutron Server)

Make sure gateway for external subnet belongs public subnet.