[OpenWrt-Devel] Configuring OVS on OpenWRT

[Yousong Zhou]

On 21 November 2014 10:03, Yilun Zhou <yilun.zhou at duke.edu> wrote:
> Hi,
>
>
> I have installed OVS on my router and I want to connect it with a Floodlight
> controller. The IP address of the laptop on which Floodlight is running is
> 192.168.1.161 and Floodlight is running on port 6633. Here is what I am
> doing.
>
>
> First, I start Floodlight controller (the vanilla version without any
> change). Then I turn on the router and ssh into it. Executing "ifconfig" on
> it will give me:
>
>
> br-lan    Link encap:Ethernet  HWaddr 4E:60:DE:E6:B2:8F
>           inet addr:192.168.1.1  Bcast:192.168.1.255  Mask:255.255.255.0
>           inet6 addr: fe80::4c60:deff:fee6:b28f/64 Scope:Link
>           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
>           RX packets:14712 errors:0 dropped:0 overruns:0 frame:0
>           TX packets:16189 errors:0 dropped:0 overruns:0 carrier:0
>           collisions:0 txqueuelen:0
>           RX bytes:2100036 (2.0 MiB)  TX bytes:10682748 (10.1 MiB)
>
> eth0      Link encap:Ethernet  HWaddr 4E:60:DE:E6:B2:8F
>           inet6 addr: fe80::4c60:deff:fee6:b28f/64 Scope:Link
>           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
>           RX packets:0 errors:0 dropped:0 overruns:0 frame:0
>           TX packets:2902 errors:0 dropped:0 overruns:0 carrier:0
>           collisions:0 txqueuelen:1000
>           RX bytes:0 (0.0 B)  TX bytes:400010 (390.6 KiB)
>           Interrupt:4
>
> eth0.1    Link encap:Ethernet  HWaddr 4E:60:DE:E6:B2:8F
>           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
>           RX packets:0 errors:0 dropped:0 overruns:0 frame:0
>           TX packets:2897 errors:0 dropped:0 overruns:0 carrier:0
>           collisions:0 txqueuelen:0
>           RX bytes:0 (0.0 B)  TX bytes:386971 (377.9 KiB)
>
> eth1      Link encap:Ethernet  HWaddr 4C:60:DE:E6:B2:90
>           inet addr:10.181.27.151  Bcast:10.181.27.255  Mask:255.255.252.0
>           inet6 addr: fe80::4e60:deff:fee6:b290/64 Scope:Link
>           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
>           RX packets:58936 errors:0 dropped:328 overruns:0 frame:0
>           TX packets:11874 errors:0 dropped:0 overruns:0 carrier:0
>           collisions:0 txqueuelen:1000
>           RX bytes:17323683 (16.5 MiB)  TX bytes:1944846 (1.8 MiB)
>           Interrupt:5
>
> lo        Link encap:Local Loopback
>           inet addr:127.0.0.1  Mask:255.0.0.0
>           inet6 addr: ::1/128 Scope:Host
>           UP LOOPBACK RUNNING  MTU:16436  Metric:1
>           RX packets:16 errors:0 dropped:0 overruns:0 frame:0
>           TX packets:16 errors:0 dropped:0 overruns:0 carrier:0
>           collisions:0 txqueuelen:0
>           RX bytes:3578 (3.4 KiB)  TX bytes:3578 (3.4 KiB)
>
> wlan0     Link encap:Ethernet  HWaddr 4C:60:DE:E6:B2:8F
>           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
>           RX packets:392 errors:0 dropped:0 overruns:0 frame:0
>           TX packets:501 errors:0 dropped:0 overruns:0 carrier:0
>           collisions:0 txqueuelen:1000
>           RX bytes:61323 (59.8 KiB)  TX bytes:125276 (122.3 KiB)
>
> wlan1     Link encap:Ethernet  HWaddr 4C:60:DE:E6:B2:91
>           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
>           RX packets:6925 errors:0 dropped:0 overruns:0 frame:0
>           TX packets:8214 errors:0 dropped:0 overruns:0 carrier:0
>           collisions:0 txqueuelen:1000
>           RX bytes:1138837 (1.0 MiB)  TX bytes:7156326 (6.8 MiB)
>
> Specifically wlan0 is 2.4GHz wifi and wlan1 is 5GHz wifi. I want to use
> Floodlight to control 2.4GHz wifi (wlan0). I do not know exactly what br-lan
> is. So if anyone can explain it to me that would be great.
>
>
> Then I use "ovs-vsctl del-br" to delete any remaining bridge so that
> "ovs-vsctl show" will report nothing.

OpenWrt's default firewall policy will block any incoming and forward
traffic and lan network is an exception so that user from LAN can
access 192.168.1.1:{20,80}.  br-lan is the bridge interface of LAN
consisting of eth0 and wlan0 in your case.

> Then I have the following
> configuration file that I execute.
>
>
> ovs-vsctl add-br br0;
> ovs-vsctl add-port br0 wlan0;
> ovs-vsctl add-port br0 br-lan;
> ifconfig br-lan 0.0.0.0;
> ifconfig br0 192.168.1.1;
> ovs-vsctl set-controller br0 tcp:192.168.1.161:6633;

I am not familiar with ovs-vsctl, but replace above commands with the
following line should work.

                ovs-vsctl set-controller br-lan tcp:192.168.1.161:6633;

>
> However, after I execute this program, the only connection that I have is
> SSH. I can't browse the Internet anymore. However, my Floodlight controller
> shows the connection from br0

Output traffic is allowed by default.

Regards.

        yousong

> and if I were to capture PacketIn events, I
> can see that it receives some packets from time to time. Nevertheless, it is
> more like periodic update than network request because rapidly refreshing my
> webpage will not significantly increase the packets received.
>
> Could anyone tell me what might go wrong?
>
> Thanks,
> Yilun
>
>
>
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