OpenStack Neutron Packet Walkthrough (DVR). Twitter: @davidmahler LinkedIn: https://www.linkedin.com/in/davidmahler Links: Me: https://www.linkedin.com/in/davidmahler OpenStack Documentation: http://docs.openstack.org/ RDO: http://rdoproject.org/ Assaf Muller's Blog: http://assafmuller.com/ Introduction to Neutron: https://www.youtube.com/watch?v=yqFpyubsYfE Linux Network Namespaces: https://www.youtube.com/watch?v=_WgUwUf1d34 Introduction to VXLAN: https://www.youtube.com/watch?v=Jqm_4TMmQz8 Introduction to Open vSwitch: https://www.youtube.com/watch?v=rYW7kQRyUvA Introduction to OpenFlow: https://www.youtube.com/watch?v=l25Ukkmk6Sk Some commands used: ip info ip a see routing table ip route see policy routing rules ip rule list see a particular routing table ip route show table (table id) list linux bridges brctl show packet capture, disable resolution, show mac/L2 info, filter on icmp tcpdump -i (interface) -n -e icmp list iptables rules iptables -S iptables rules for the nat table only iptables -S -t nat see open flow rules for a particular ovs instance and flow table ovs-ofctl dump-flows (ovs instance name) table=(table number) watch open flow rules counters move watch -n.5 "ovs-ofctl dump-flows (ovs instance name) table=(table number) | grep -v n_packets=0" see fowarding db of ovs ovs-appctl fdb/show (ovs instance name) see ovs instances and their ports ovs-vsctl show see open flow port numbers ovs-ofctl show (ovs instance name) list network namespaces ip netns go to a bash shell for a particular network namespace ip netns exec (namespace id) bash list neutron routers neutron router-list see where a neutron router is hosted neutron l3-agent-list-hosting-router (router name) status of proxy arp cat /proc/sys/net/ipv4/conf/(interface name)/proxy_arp