Print a command and send it to the shell

addPort for asking OVSDB driver to add the port

NewOVSSwitch for creating a ovs bridge

https://gist.github.com/kotakanbe/d3059af990252ba89a82

NewContainer for creating a docker container

NewHost for creating a network namespace

SetCtrl for seting up OpenFlow controller for ovs bridge

http://play.golang.org/p/m8TNTtygK0

Create a veth pair

Generate pseudo random string with length 8, but not Universally unique.

AddHost will add a host to topology. set docker to true can enable docker container as a host

AddHostWithConf will add a host to topology.

AddLink will add a link between switch to switch or host to switch.

AddSwitch will add a switch to topology.

GetIPs will get IP address from a CIDR notation Return an array with IP address. negative num for getting all IP addresses (network address and broadc

NewHostConfig is a constructor to initial host network configuration.

Custom topology example leftHost --- leftSwitch --- rightSwitch --- rightHost

Custom topology example C1 C2 | | leftHost --- leftSwitch --- rightSwitch --- rightHosts

Custom topology example Single switch with 8 hosts