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I'm using Open vSwitch to create a switched network between virtualBox guest machines, and i want that the host OS (Ubuntu 12.04) join this network and to configure it as the gateway of this virtual network:

First, i created a vswitch and i added ports to tap devices (that virtual machines use them as bridged interfaces):

ovs-vsctl add-br sw0
ovs-vsctl add-port sw0 tap0

After that, i set statically the ip of Lubuntu 12.04 virtual machine :

ifconfig eth0 192.168.1.3/24 up
route add -net 0.0.0.0/0 gw 192.168.1.1

In the host os side, i also set the ip address :

ifconfig sw0 192.168.1.1/24 up

At this time, i can ping from Lubunut to Ubunutu. I want now, in the host machine to use IP masquerade to forward traffic from network 192.168.1.0/24 to my physical interace (connected to Internet) :

sysctl -w net.ipv4.ip_forward=1
iptables -t nat -A POSTROUTING -o eth1 -s 192.168.1.0/24 -j MASQUERADE

So from Lubuntu (the virtual machine), i can ping the Ubuntu eth1 interface, but i cannot reach the real network (e.g: the gateway on real LAN), i have tried :

nslookup google.com
dig @8.8.8.8 yahoo.com
dig @192.168.30.1 google.com

Network Topology

   Internet (real gw) ------ Host OS -------- vswitch -------- VBox Guest 1
           192.168.30.1   ip masquerade    192.168.1.0/24
                                                |
                                                 ------------ VBox Guest 2
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