Multiple solutions to interconnect Linux namespaces using a software based switch

Howto connect two network namespaces using veth pairs
http://fosshelp.blogspot.com/2014/07/howto-connect-two-network-namespaces.html

Howto Connect two network namespaces using Linux Bridge and veth pairs
http://fosshelp.blogspot.com/2014/08/connect-two-network-namespaces-using.html

Howto Connect network namespaces using OpenvSwitch and veth pairs
http://fosshelp.blogspot.in/2014/10/network-namespaces-openvswitch-veth.html

Howto Connect network namespaces using OpenvSwitch and OpenvSwitch Ports
http://fosshelp.blogspot.com/2014/10/namespaces-openvswitch-and-openvswitch.html