OpenStack Neutron Packet Walkthrough (DVR)

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://youtu.be/yqFpyubsYfE
Linux Network Namespaces: https://youtu.be/_WgUwUf1d34
Introduction to VXLAN: https://youtu.be/Jqm_4TMmQz8
Introduction to Open vSwitch: https://youtu.be/rYW7kQRyUvA
Introduction to OpenFlow: https://youtu.be/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