OpenStack Neutron Packet Walkthrough (DVR).
Twitter: @davidmahler
LinkedIn: [ Ссылка ]

Links:
Me: [ Ссылка ]
OpenStack Documentation: [ Ссылка ]
RDO: [ Ссылка ]
Assaf Muller's Blog: [ Ссылка ]
Introduction to Neutron: [ Ссылка ]
Linux Network Namespaces: [ Ссылка ]
Introduction to VXLAN: [ Ссылка ]
Introduction to Open vSwitch: [ Ссылка ]
Introduction to OpenFlow: [ Ссылка ]

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

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