I read the FAQ.

In my system I have only one NIC through which I am connected to the
internet.

so I did the following:

# ovs-vsctl add-br br0
# ovs-vsctl add-port br0 em1
# ifconfig em1 0.0.0.0
# ifconfig br0 <ip> netmask <mask>
# ip route del default dev em1
# ip route add default dev br0
# dhclient br0

# ovs-vsctl show
667ae087-8a68-47e3-ba17-
406fc2df42bc
    Bridge "br0"
        Port "br0"
            Interface "br0"
                type: internal
        Port "em1"
            Interface "em1"

# ifconfig -a
br0: flags=4419<UP,BROADCAST,
RUNNING,PROMISC,MULTICAST>  mtu 1500
        inet XX.XX.XX.XX  netmask 255.255.240.0  broadcast ++.++.++.++
        inet6 fe80::1ec1:deff:fe65:6fee  prefixlen 64  scopeid 0x20<link>
        ether 1c:c1:de:65:6f:ee  txqueuelen 0  (Ethernet)
        RX packets 286290  bytes 54385389 (51.8 MiB)
        RX errors 0  dropped 284  overruns 0  frame 0
        TX packets 20230  bytes 3545570 (3.3 MiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

em1: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet6 fe80::1ec1:deff:fe65:6fee  prefixlen 64  scopeid 0x20<link>
        ether 1c:c1:de:65:6f:ee  txqueuelen 1000  (Ethernet)
        RX packets 307970  bytes 58277898 (55.5 MiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 21322  bytes 3835886 (3.6 MiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
        device interrupt 19  memory 0xf3000000-f3020000

lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 16436
        inet 127.0.0.1  netmask 255.0.0.0
        inet6 ::1  prefixlen 128  scopeid 0x10<host>
        loop  txqueuelen 0  (Local Loopback)
        RX packets 12  bytes 1090 (1.0 KiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 12  bytes 1090 (1.0 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

Now I can use the internet again.

How IP addresses are manipulated in Open Vswitch?

If I create virtual machines connected to br0. There IP address will also
be in the same subnet of  XX.XX.XX.XX.?

For a different subnet, do I have to create another bridge? Is it required
for every bridge to ported to a physical NIC?

Can I create a DHCP server in Open Vswitch?

Thanks,




On Thu, Jul 19, 2012 at 3:46 PM, Ben Pfaff <b...@nicira.com> wrote:

> On Thu, Jul 19, 2012 at 10:43:06AM +0200, Arindam Choudhury wrote:
> > So in OpenVSwitch, we create a bridge and connect it with the ethernet
> card.
> >
> > So, is it mean that the guests will be in the same subnet of the host?
>
> Not necessarily.
>
> > Is it possible to put guests on a different subnet?
>
> Yes.
>
> > I am very new and trying to understand linux bridging and OpenVSwitch.
> Can
> > you suggest me some reading?
>
> The FAQ: http://openvswitch.org/faq/
>
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