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#1 2020-08-23 12:56:10

From: Australia, Newmerella
Registered: 2020-08-23
Posts: 7

Step 1: Delete libatomic.so.1.0.0 and soft link

As a software company, it is useful to use Open vSwitch for cloud networking.
This post contains detailed steps and information on how to build and configure Open vSwitch.To run Open vSwitch, the Linux kernel version has to be 2.6.32 or higher.
Currently, OpenWrt trunk r43236 has a kernel version 3.10.58 and Open vSwitch version 2.3.0.
Keep checking for updates for both of them.
More on Open vSwitch: http://openvswitch.org More on OpenWrt: https://openwrt.org  [See Also: Virtualization in Custom Software Development and Testing] Flashing OpenWrt On Your Device The latest build image of OpenWrt can be downloaded here. This download link provides pre-built images for different platforms; you need to choose one specific to your device.
There are different ways to flash the router.
To learn how to flash image specific to your device, click here. Select your device from the list of supported devices to find the detailed procedure on how to flash your hardware.
It will take few minutes to complete.
Once you finish the flashing, you need to set IP of your host as 192.168.1.x.
If the static protocol and DHCP protocol are set, the router will automatically assign the IP address in the range of 192.168.1.x.
Enabling Web Interface and SSH Access By default, Luci (Web interface) is not installed and the root password is not set, so it is not possible to access the system through SSH. To enable these features, .

Follow these steps:  Step 1: Telnet to your device to login to your device’s terminal
$ telnet  Step 2: Set root password

Enter new password and confirm.
[email protected]:~# passwd  Step 3: Install Luci from the default package manager (optional if your router does not have enough flash).
You need Internet connection to execute the following steps.
[email protected]:~# opkg update [email protected]:~# opkg install luci Installing Open vSwitch There are two methods to install Open vSwitch: Installation using default package manager Open vSwitch package is available on OpenWrt repository.
To install Open vSwitch you need to delete the libatomic.so.1.0.0 and its soft link provided by gcc as Open vSwitch package is also tries to install libatomic.so.1.0.0 and fails because it could not create soft link.
Step 1: Delete libatomic.so.1.0.0 and soft link.

[email protected]:~# cd /lib [email protected]:~# rm libatomic.so*  Step 2: Install Open vSwitch

[email protected]:~# opkg install openvswitch To verify if Open vSwitch is installed correctly, the output must show that ‘ovsdb-server’ and ‘ovs-vswitchd’ daemon are running.
[email protected]:~# ps w | grep ovs  Installation by selecting Open vSwitch while building Image from source   Step 1: Use the direct download source.
(Choose one of the two below).
$ git clone git://git.openwrt.org/openwrt.git $ svn co svn://svn.openwrt.org/openwrt/trunk/  Step 2: Change directory to openwrt and update and install feeds.
$ ./scripts/feeds update -a $ ./scripts/feeds install -a  Step 3: Configure .config file using menuconfig.
$ make menuconfig   Â Select Target System.
This gives you the target hardware details, for example Atheros AR7xxx/AR9xxx.
The Subtargtet is specific to your device.
Select Kernel modules, then Network Support, then kmod-tun.
Then from Network, select openvswitch.
$ make kernel_menuconfig Select the package.
Networking Support, then Networking Options, .

Then Hierarchical Token Bucket (HTB)    Step 4: Start the compilation

This will take few hours depending upon your machine’s configuration.
Press option – j on the keyboard to speed up the compilation process (optional).This process needs Internet connection to download packages.

$ make  Step 5: Once the compilation is done

the compiled image can be found at bin/ directory inside openwrt (parent) directory.
Select the image specific to your device and follow the steps mentioned in the sections “Flashing OpenWrt to your device” and “Enabling Web Interface and SSH access.”   Step 6: Verify if Open vSwitch installed correctly.

[email protected]:~# ps w | grep ovs  Configuring Open vSwitch  Step 1: Configure interfaces

If router has more than one ports, by default all are connected on a single LAN.
To turn it into a soft switch, you need to separate all ports from LAN and WLAN.
(I have separated only wlan0 and wlan1 as my intention is to connect hosts wirelessly.) Here is snapshot of my /etc/config/network file:      Step 2: Enable the wlan0 and wlan1 interfaces, by default wlan0 and wlan1 interfaces are disabled.
[email protected]:~# ifconfig wlan0 up [email protected]:~# ifconfig wlan1 up  Step 3: Create a bridge using ovs-vsctl.

[email protected]:~# ovs-vsctl add-br br-wlan0  Step 4: Add ports to the bridge

[email protected]:~# ovs-vsctl add-port br-wlan0 wlan0 [email protected]:~# ovs-vsctl add-port br-wlan0 wlan1  Step 5: Set the controller. Here IP is IP address of the host on which controller is running. Port shows what controller is listening (default is 6633).
[email protected]:~# ovs-vsctl set-controller br-wlan0 tcp:IP:PORT  Step 6: Verify the configuration.
[email protected]:~# ovs-vsctl show output should look like: [email protected]:~# ovs-vsctl show 867ac51b-d75b-4568-a77c-995e91459069  Bridge "br-wlan0"  Controller "tcp:"  is_connected: true  Port "wlan1"  Interface "wlan1"  Port "wlan0"  Interface "wlan0"  Port "br-wlan0"  Interface "br-wlan0"  type: internal If your controller has not started yet, the output above will not show.
Start your controller and again check if the “ovs-vsctl show” output.
If the output “is_connected: true” shows, the controller is now connected.

Verifying OpenFlow enabled Soft-switch with OpenDaylight  Step 1: Connect hosts to wlan
Step 2: Check if the controller shows the switch and the connected hosts

Here is a snapshot of the controller:    Step 3: Ping from connected host1 to connected host2.
It should work.

Step 4: Create a flow in controller with the Drop action and install flow

Now ping should not happen.
You can test different scenarios with different flow entries.
As a software engineer, you can now put this knowledge on software development services to enhance your cloud networking.
[See Also: Python Logging for Software Development Services] Everything you need to know about outsourcing technology development Access a special Introduction Package with everything you want to know about outsourcing your technology development.
How should you evaluate a partner.
What components of your solution that are suitable to be handed off to a partner.
These answers and more below.
Introduction Package.


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